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Description:
USB boost/buck power supply module, powered by USB, adjust potentiometer to get the required voltage.
Features:
One button to turn off the output;
Supply ON/OFF display screen;
S
upport low power mode;
Support sleep mode;
Support both standard USB and Micro USB and pads input voltage;
.Potentiometer with rotating handle.
.Parameters:
Input voltage: DC 3.5-12V;
Output voltage:DC 1.2-24V;
Output power:
Input 1.2-2V,output power within 2W;
Input 2V-20V,output power within 3W;
Input 20V-24V,output power with in 2.5W;
4>.Display:3Bit digital tube display;
5>.Size:80*20*14mm.
4.Use steps:
1>.Input voltage from Standard USB or Micro USB or ‘VIN ’ and ‘VIN-’;
2>.Turn ON display screen;
3>.Adjust potentiometer to get the required voltage;
4>.Connect load.
5.Application:
1>.Ordinary power supply;
2>.Battery charger;
3>.LED drive power;
4>.Instrument voltage display;
5>.Test meter;
6>.Circuit test;
7>.Power conversion.
6.Please Note:
1>.It is not a high power supply, please use it within the power range.
7.Package:
1>.1pcs XY-UP USB boost/buck power supply module

Product Description
100% brand new and high quality
Input Voltage: DC 12V
Output ATX: Max 160W
Output Power: 84W
Standard 24pin ATX Power Connector
Power Efficiency: ≥ 92%
Operating temperature: 0℃ - 40℃
Storage temperature: -20℃ - 80℃
Size: 55×33×13mm/2.17×1.30×0.51in (Approx.)
PCB Size: 55×22mm/2.17×0.87in (Approx.)
DC 5.5*2.5 (16AWG): 300mm/11.81in
4-pin IDE female (18AWG): 240mm/9.45in
15-pin SATA (18AWG): 240mm/9.45in
CPU 4-pin (18AWG): 240mm/9.45in
4-pin IDE to 15-pin SATA (18AWG): 100mm/3.94in
Output characteristics:
Output Current 12V (11.4V～12.6V): 3A
Output Current 5V (4.75V～5.25V): 5A
Output Current 3.3V (3.14V～3.47V): 5A
Output Current 5VSB (4.75V～5.25V): 1A
Output Current -12V (-11.4V～-12.6V): 0.1A
Application:
Mini computer, all-in-one computer, POS machine, digital set top box, ITX case, network server,
advertisement machine, bank terminal, etc.

product description:
Board size 1.3*1.3CM
The SHT20 digital temperature and humidity sensor introduced by Swiss Sensirion, based on the world's leading CMOSens ® digital sensing technology, has extremely high reliability and excellent long-term stability. Full-scale calibration, two-wire digital interface, can be directly connected to the single-chip microcomputer, greatly shortening the development time, simplifying the peripheral circuit and reducing the cost. In addition, the small size, rapid response, low energy consumption, immersion, strong anti-interference ability, integrated temperature and humidity, and dew point measurement, high cost performance, make this product suitable for applications in many occasions.
Technical Parameters:
1. Humidity measurement range: 0~100% RH
2. Humidity measurement accuracy: ±3% RH
3. Temperature measurement range: -40~125℃
4. Temperature measurement accuracy: ±0.3℃
5. Working voltage: 2.1~3.6VDC (please note: do not use 5V power supply!!!)
6. I2C interface output

Detailed introduction:
40pcs 10cm 2.54mm 1pin Female to Female jumper wire Dupont cable
2.54mm 1pin
Female to Female
Length:10cm
Qty:40pcs(40pcs x 1)
40pcs 10cm 2.54mm 1pin Male to Female jumper wire Dupont cable 2.54mm 1pin Male to Female Length:10cm Qty:40pcs(40pcs x 1)
40pcs 10cm 2.54mm 1pin Male to Male jumper wire Dupont cable
2.54mm 1pin
Male to Male
Length:10cm
Qty:40pcs(40pcs x 1)

Detailed introduction:
40pcs 10cm 2.54mm 1pin Female to Female jumper wire Dupont cable
2.54mm 1pin
Female to Female
Length:10cm
Qty:40pcs(40pcs x 1)
40pcs 10cm 2.54mm 1pin Male to Female jumper wire Dupont cable 2.54mm 1pin Male to Female Length:10cm Qty:40pcs(40pcs x 1)
40pcs 10cm 2.54mm 1pin Male to Male jumper wire Dupont cable
2.54mm 1pin
Male to Male
Length:10cm
Qty:40pcs(40pcs x 1)

Detailed introduction:
40pcs 10cm 2.54mm 1pin Female to Female jumper wire Dupont cable
2.54mm 1pin
Female to Female
Length:10cm
Qty:40pcs(40pcs x 1)
40pcs 10cm 2.54mm 1pin Male to Female jumper wire Dupont cable 2.54mm 1pin Male to Female Length:10cm Qty:40pcs(40pcs x 1)
40pcs 10cm 2.54mm 1pin Male to Male jumper wire Dupont cable
2.54mm 1pin
Male to Male
Length:10cm
Qty:40pcs(40pcs x 1)

A module description
1 pair HG7881 chip motor drive
2Power ModulesVoltage : 2.5-12V
3 for motor Range: between the motor operating voltage 2.5v-12V, maximum operating current 0.8A, the current smart car voltage and current market are within this range
4Can simultaneously drive two DC motors ,OrA 4-wire two -phase stepper motor.
5PCB board size : 2.8cm * 2.1cmUltra-small size , suitable for assembly
6 is provided with a fixed mounting hole , diameter : 3mm
Two module interface specification
[ 6P black curved pin description]
1 VCC External2.5V-12V voltage
2 GND GND External
3IA1 External microcontrollerIO port
4IB1 External microcontrollerIO port
5 IA2External microcontrollerIO port
6 IB2External microcontrollerIO port
[ 4P green terminal description]
1 OA1 OB1 DC 2 -pin connection , without direction
2 OA2 OB2 DC 2 -pin connection , without direction
Three ModulesInstructions
Switched VCC, GND module power indicator light
IA1Input high ,IA1Input low , [OA1 OB1 ]Motor is transferred ;
IA1Input low ,IA1Input high , [OA1 OB1 ]Motor reverse ;
IA2Input high ,IA2Input low , [OA2 OB2 ]Motor is transferred ;
IA2Input low ,IA2Input high , [OA2 OB2 ]Motor reverse ;

Product Features
· Input voltage range: 6V-32V
· Output voltage: default 5V, automatically adjust between 3-12V after triggering fast charge
· Output power: up to 24W (5V/3.4A, 9V/2.5A, 12V/2A, etc.)
· Output voltage cable compensation function
· Conversion efficiency: 90% -97%
· Support multiple fast charging protocols
· Input overvoltage and undervoltage protection
· Input overcurrent protection
· Output overcurrent, short circuit protection
· Machine over temperature protection
Support fast charge agreement
· Support DCP protocol, BC1.2, Apple, Samsung protocol
· Support Huawei Fast Charge Protocol FCP/SCP
· Support Huawei Fast Charge Protocol AFC
· Support Spreadtrum Fast Charge Protocol SFCP
· Support Qualcomm QC2.0 and 3.0
· Support MTK PE1.1/PE2.0
Applications
· Solar panel to mobile phone charging
· Car charging retrofit
· Driving recorder power supply
· Home power supply, smart plug modification
· Fast charge adapter

Product Description
Vibroswitch sensor
Working Voltage: 3~5V
Application All kinds of electronic products
Can be connected directly to the microcontroller output IO port
Anti-interference ability
The standard 2.54mm pin to do input and output connections
Works with Official Boards
With fixed bolt hole for easy installation
Application: Great for DIY project
Material: PCB Brass
Dimensions: 29 x 16 x 8 mm / 1.14 x 0.63 x 0.31 inch
Color: Black

Features:
★ This model is made of imported main control chip, the main control chip is fixed at 1.2MHZ oscillation frequency, and the internal use of ultra-low on-resistance (Ron) MOS tube, the overall work is stable and efficient.
★ This module has over-temperature protection and over-current protection functions, which can ensure the safety of electrical appliances and modules.
★ This module has an ultra-small volume, only 20*20*5 (length, width and height), and weighs less than 10 grams. It is very suitable for applications with high current and small size, such as aviation models.
★ This module uses machine placement and reflow soldering. At the same time, each module undergoes a two-hour aging test before shipment to ensure high reliability.
★Size: 20*20*5mm

Product Description
The power amplifier circuit board designed using the official standard, the chip uses a selection of US imports original Longding micro Class D amplifier chip. Good product chip is necessary and the majority of music lovers to share, this is our consistent philosophy! The amplifier with ultra-high efficiency, large power, in the case of 12V power supply can output 10W 10W of power, the chip without fins, but also with overheating, over-current protection function, the function can be said to be very powerful.
The amplifier board is still difficult to drive two 15W speakers, high efficiency Class D amplifier board pure is not blown out, the most suitable for small rooms listening to music use.
You need to use a large heat sink when using Spike TDA2030 amplifier chip board, TDA2030 (15W 15W) This traditional 15W amplifier board to drive two speakers, and high-efficiency Class D PAM8410 pure amplifier board need only drive two 15W speakers Use a small heat sink, high efficiency super power, the sound quality is great.
Modification:
1. Analog Microelectronics America's original PAM8610 chip as amplifier chip, power can reach 10W 10W.
2. As pure class D amplifier board power requirements is relatively high, the exclusive use of the power amplifier board enthusiast 2200UF capacitor filter, the elimination of exchange voice, without interference, pure sound quality.
3. Using automatic placement machine production, the board is more beautiful.
4. Strip 5.5X2.5 standard power outlet, power input is very convenient. (Positive outside and negative inside)
Recently found to have bad business to buy this product to copy, workmanship, PCB design, and capacitor materials are not as ours, we have absolute import original IC, coupled with excellent PCB design and machine placement soldering, stable and reliable performance.
Pure Class D chip without fins can open detonation music, and now we have to chip plus a heat sink, you do not have to worry about overheating. !
Overview:
When the power supply voltage of DC 8V-12V, PAM8610 be able to 4Ω load 10W 10W output power, high-quality sound.
Technical Parameters:
Power: typically 10W
Voltage: DC DC8V-12V
Can drive speakers: 10W-15W, 4 -8 Euro Euro
Built-in power-impact sound canceling circuit, no power on impact sound
Physical picture:
Compact board, 3.5MM stereo audio input interface, audio input with a standard easy. With fully enclosed volume control potentiometer, can be arbitrary adjust the volume, use and installation are very flexible and convenient
Use American Power Analog Microelectronics original PAM8610 pure Class D amplifier chip as the power amplifier IC, the maximum it can provide to 10W 10W of power, incredible sound.
PCB component placement tidy line with US FCC standards, all using genuine components using devices capable of long-term stability.
Heart-highlight fine arts star Electronic Manufacturing insist that only new element was the market mature products, please rest assured purchase.
Use enthusiast 2200UF capacitor, ensure pure sound quality.
Board size: Long 40mmX (excluding protruding parts of the volume potentiometer, etc.) wide by 19 40mmX
Subjective sound experience:
PAM8610 (10W) power to the PAM8406 (6W) bigger, more powerful speaker can drive, found this amplifier board can drive two 25W speakers.
Listen really surprised, it is hard to believe that such a small piece of the chip can be issued so great volume, stereo effect is very good, indicating a high degree of chip channel separation. Case of playing music, the performance was better than expected, chip minimal heat, the sound was amazing, more transparent treble, bass, or a certain amount, quality count in a small amplifier board in the upper level,
listen to music from a very comfortable .

Product Description:
1. Features
1). The sensitivity of the sensor is adjustable.
2). Angle processing humanized design.
3) Standard XH2.54 interface.
2. Scope of application
It can meet various resistance sensors (such as photoresistors, thermistors, etc.).
3. Specification
Operating voltage: 3.3 V to 5 V.
Output form: analog output.
b: Digital output, output threshold.
Product size: 29.5 mm * 13.5 mm.
Mounting hole size: Φ3.
4. Instructions
1. The probe input interface has two rows of needles, which can meet various resistance sensors (such as photoresistors, thermistors, etc.), internal pull-up 10K voltage divider voltage sensor input comparator, adjustable resistance voltage comparator internal supervision negative The input voltage is compared, and the comparison result is output (when the positive terminal voltage is higher than the negative terminal, the output is 1, otherwise it is 0).
2. The output is connected to any IO port of the SCM (according to the process definition), and the low-level change is detected by the single-chip microcomputer, thereby detecting the change of the environmental brightness.
3. The analog output AO of the small board can be connected to the input voltage acquisition.

Features:
DIY Mobile Power Supply, 5V output for charging Phone, MP3, MP4, PSP, etc
Modules nature: non-isolated Buck
With Overcurrent Protection
Rectification: Non-synchronous rectification
Note: Please connect right as the printed : N-,IN ,OUT-,OUT ,or else the Module will be burned
Specifications:
Input voltage: DC 7- 24V
Output voltage: DC 5V
Output current: 3A (max)
Conversion efficiency: 96% (MAX)
Switching frequency: 340KHz
Output ripple: 30mV (max)
Load regulation: ± 0.5%
Voltage regulation: ± 2.5%

Features
High Quality Momentary Contact Tact Switch.
Contact Type: Momentary Contact; Current Rating: 50mA; Voltage Rating: DC 12V; Contact Resistance: 100M Ohm.
Switch Size: 6 x 6mm, Button Size: 4.3mm / 5mm / 6mm / 7mm / 8mm / 9mm / 10mm / 11mm / 12mm / 13mm
Feature momentary contact, 4 pins, round black push button, through hole mounting, Used in the fields of electronic products, household appliances and more.
Package include
1 box 100pcs 6*6 Tact Switch

Description
Mercury switch module and digital 13 interface comes with LED to build a simple circuit, the production of tilt lights
With the digital 13 interface comes with the LED, the mercury tilt switch sensor access to digital 3 interface, when the mercury tilt switch sensor has a button signal, LED light, and vice versa.
Routine source code:
int Led = 13; // define the LED interface
int buttonpin = 3; // Define the mercury tilt switch sensor interface
int val; // Define the numeric variable val
void setup ()
{
pinMode (Led, OUTPUT); // define the LED as the output interface
pinMode (buttonpin, INPUT); // Define the mercury tilt switch sensor as the output interface
}
void loop ()
{
val = digitalRead (buttonpin); // Write the value of the numeric interface 3 to val
if (val == HIGH) // The LED flashes when the mercury tilt switch sensor detects a signal
{
digitalWrite (Led, HIGH);
}
else
{
digitalWrite (Led, LOW);
}
}

Description
100% Brand new and high quality
Compact, lightweight, and durable
Model: SRD-5VDC-SL-C
Control Voltage: 12V
Pin: 5Pin
Load voltage/Current: 10A 250V, 10A 30VDC/10A 125VAC, 10A28VDC
Color: Blue
Size: Approx. 1.8 x 1.5 x 1.6cm (L*W*H)
Application:
Modules, Development board, Connector, Cables & Adapters, DIY PCB Universal Board, IC Sockets

Description
100% Brand new and high quality
Compact, lightweight, and durable
Model: SRD-5VDC-SL-C
Control Voltage: 12V
Pin: 5Pin
Load voltage/Current: 10A 250V, 10A 30VDC/10A 125VAC, 10A28VDC
Color: Blue
Size: Approx. 1.8 x 1.5 x 1.6cm (L*W*H)
Application:
Modules, Development board, Connector, Cables & Adapters, DIY PCB Universal Board, IC Sockets

Product Description
Wireless Bluetooth MP3 Audio Receiver Module BLT 4.2 Lossless Decoder Board Kit Low Consumption M28
Power supply: It can be directly powered by the Micro- USB Android cable 5V, or it can be connected to a 5V power supply or a 3.7V lithium battery. Note that the 5V and 3.7V power supply interfaces are different. The 5V voltage is connected to 5V and GND, and the 3.7V lithium battery is connected to VBAT and GND.
Audio output: The earphone can be directly connected to the 3.5mm audio interface, or it can be wired for the audio input of the power amplifier board (interface L/R/AGND can be directly wired).
This product is a low-power Bluetooth design solution, supports the latest Bluetooth 4.2 transmission, two-channel stereo lossless playback, and the module can be connected to Bluetooth to quickly realize Bluetooth wireless transmission, which is very convenient. In an open environment, the Bluetooth connection distance can be up to 20 meters.
Widely used in a variety of Bluetooth audio reception, a variety of audio DIY modification.
color: picture color
material: metal
size: 4.5*2cm
Package Contents:
1 * Module
Only the above package content, other products are not included.
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is /- 1-3cm.

Product Description
Onboard 8P-chip carrier, can support AT24C256 series chips;
Pin power supply, on-board power indicator;
on-board pull-up resistor for I2C communications required ;
All pins leads out and be marked, the address input and the write-protect pin direct jumper settings;
PCB board size: 36.5 (mm) x12 (mm)

Product Description
1.Switch 10Mbps network automatically
2.Half/Full duplex 10Mbps operation
3.Support full duplex flow control(IEEE 802.3X)
4.Support all USB standard commands
5.Support suspend/resume detection logic
6.Compliant to USB interface verison 1.0/1.1/2.0/3.0
7.Support 10Mbps N-way auto-negotiation operation
8.Integrated fast ethernet MAC, physical clip and transceiver in one chip
NOTE: This Network adapter IC is RD9700, it supports maximum Ethernet speed is 10Mbps,if you network speed is more than 10Mbps .

Product Description
Description of 2 series lithium battery boost charging board
The 2 series lithium battery boost charging board is a double link series lithium battery synchronous boost charging module with high integration and high reliability. The charging efficiency is 94% at the input voltage of 5V, bat voltage 8.4v and charging current of 1.2A. Charging integrates various protection functions: input overvoltage, input undervoltage, output overvoltage, output short circuit, chip over temperature, and maximum charging time of 24 hours.
Parameter function description
1. working range of input voltage: 4.6v-5.5v
2.5v/2a input synchronous boost charging
3. input adaptive charging
4. support two 4.2V batteries
5. Ed displays the charging status, and supports the display of two color lights
6. self contained trickle / constant current / constant voltage charging mode
7. 24 hour time out protection for charging
8. output over current, over voltage and short circuit protection
9. input over voltage and undervoltage protection
10. input voltage withstand voltage 13V
11. OTP over temperature protection
12. size: 28mm * 17mm

Description
HW-437 51 MCU Download Line USB AVR ISP Programmer ATMEGA8A-AU Support Win 8.1/8/7/XP Programming Module Board
Feature:
Onboard imported ATMega8A-AU chip.
With two indicator lights for power supply and programming.
Onboard 500mA overcurrent protection self-recovery fuse.
Support 5V and 3.3V power supply for the target board.
Automatic speed regulation, the downloader will automatically track the frequency of the programmed chip, and automatically change the speed to achieve automatic speed regulation.
The output port is ATMEL standard port, MOSI, MISO, RET, SCK, VCC, GND. It is convenient for users to connect to the target board as needed.
The product can be directly connected to the USB port of the computer.
It is suitable for WIN8.1/8/7/XP 32-bit/64-bit, system computer.
Specification:
Support burn chip:
51 series: AT89S51/ /AT89S52/ /AT89S53// AT89S8253//AT89S2051// AT89S8252//AT89S4051
Burning software: Progisp1.72.
Download link: (http://web2110575.w218.badudns.cc/channel.?id=21)
Product size: 42*16*8mm
Product weight: 18g
Packing size: 50*50*15mm
Package weight: 18g
Note:
Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!
Please allow 1-2cm measuring deviation due to manual measurement.

Packages:
1 X ISP Programming
1 X Connecting Line

Description:
The ADS1115 are precision analog-to-digital converters (ADCs) with 16 bits of resolution offered in an ultra-small, an MSOP-10 package.
Data are transferred via an I2C-compatible serial interface, four I2C slave addresses can be selected, it operate from a single power supply at 3.3V.
It can be used to detect analog signal and convert it to digital signal.
You can attach a joy stick or other analog sensor such as NTC,temperature, dust sensor and so on.

Features:
Size: 65.0mm x 30.0mm x 18.0mm
Power Supply: 3.3v
Analog Input Voltage: GND to VDD
PROGRAMMABLE DATA RATE: 8SPS to 860SPS
INTERNAL LOW-DRIFT: VOLTAGE REFERENCE
INTERNAL PGA: Available
Resolution 16-bit
I2C™ INTERFACE: Pin-Selectable Addresses
Channels Number: 4 SINGLE-ENDED OR 2 DIFFERENTIAL INPUTS
PROGRAMMABLE COMPARATOR: 2/3 ~ 16
INTERNAL NTC Support: Available

Disclaimer:
This is LilyPad - the main board consisting of an ATmega328 with the to 5V.
The latest version of the LilyPad supports automatic reset for even easier programming.
The back side of the LilyPad is now completely flat! We now use a surface mount programming connector to keep the header from
poking through.
This version of the LilyPad now uses the new ATmega328 at 8MHz. 0016 supports the Pro Mini 328/8MHz/16MHZ. Use this setting when
using this new LilyPad 328.
LilyPad is a wearable e-textile technology developed by Leah Buechley and cooperatively designed by Leah and SparkFun. Each
LilyPad was creatively designed to have large connecting pads to allow them to be sewn into clothing. Various input, output,
power, and sensor boards are available. They\'re even washable!
Buying Guide!
Note:A portion of this sale is given back to Dr. Leah Buechley for continued development and education of e-textiles and also to
LLC to help fund continued development of new tools and new IDE features.
LilyPad 328

Description:
L298P Shield DC motor driver adopts the L298P driver chip wich is exclusively made for large-power motor. It can drive 2 DC motors directly with a drive current reaching 2A. The motor output is equipped with eight high-speed schottky diode as protection. This driver carries neat circuit layout and bonded components, in addition, the multi-layer design enables it to be plugged to Arduino directly.
L298P Shield DC motor driver carries PWM and PLL modes and the mode is switchable by jumpers. The motor can be powered via Arduino VIN input or terminal input on the driver, which are switchable by jumper.
Specification:
Logic part input voltage : VD: 5V
Driving part input voltage VS: VIN input 6.5~12V, PWRIN input 4.8~24V
Logic part working current Iss: ≤36mA
Driving part working current Io: ≤ 2A
Maximum dissipation power: 25W (T=75℃)
Control signal input level: High level: 2.3V ≤ Vin ≤ 5V Low level: -0.3V ≤ Vin ≤ 1.5V
Working temperature: -25℃ -130℃
Driver form: Dual power H bridge driving
Package Included:
1 * L298P Motor Driver Shield

Specifications:
Model: ESP8266
Color: Green
Size(L*W*H):65 x 40 x 18 mm
ISM: 2.4 GHz
PA: 25 dBm
Relay voltage: 220 V
Relay Current: 10 A
Input voltage: DC 7 V~30 V
Input overvoltage protection: Yes
Input overcurrent protection: Yes
Features:
1.More safe with relays PCB pin anti-climb design.
2.With ESP8266 Wifi module,4-layers board design.
3.One output status indicator, one input status indicator.
4.220V 10A relay, one normally open, one normally closed.
5.One way optocoupler isolation input, TVS input protection.
6.Access control server via TCP CLIENT mode Via HTTP protocol control.High-current terminals.
7.Input overvoltage protection, input with TVS, when voltage exceeds 33V, automatic protection will operate.

Description
1. using the NTC thermistor sensor , good sensitivity
2. the comparator output signal clean waveform is good , driving ability, than 15mA.
3. adjust the temperature distribution bit detection threshold
4. Working voltage 3.3V-5V
5. the output format : Digital switching output (0 and 1)
6. with bolt holes for easy installation
7. a small board PCB size : 3.2cm x 1.4cm
8. using a wide voltage LM393 comparator

Product Description
Size: 51 * 26.3 * 14 (L * W * H) (mm)
Operating Temperature: -40 ° to 85 °
Voltage Regulation: ± 2.5%
Load Regulation: ± 0.5%
Output ripple: 50mV (max) 20M bandwidth
Switching frequency: 300KHz
Conversion efficiency: 95% (the highest)
Output current: adjustable maximum 5A
Output voltage: 0.8V-30V
Input voltage: 5V-32V
Rectification: non-synchronous rectification
Module Properties: non-isolated constant current and voltage module.
★ The module uses imported high-quality chips, high efficiency (95% higher), and at the same time generates a small amount of heat, which can reach a current of 5A. At the same time, it cooperates with the original TI op amp to control the output current, so that the overall output is very stable.
★ This module uses the original Sanyo filter capacitor with low ESR, which can make the ripple voltage as low as 50mV!
★ This module uses machine placement and reflow soldering. At the same time, each module undergoes a two-hour aging test before shipment to ensure high reliability.
★ This module is an adjustable step-down module, and the output voltage can be changed by adjusting the blue adjustable resistor on the module. The input and output voltage difference is 1V, and the small voltage can output 0.8V.
★ The IN- (input negative), IN (input positive), OUT- (output negative), and OUT (output positive) marked on the module must be connected correctly, otherwise the module may be damaged.
★ Battery charging method of use:
1. Determine the float voltage and charging current of the rechargeable battery you need, and the input voltage of the module;
2. Adjust the constant voltage potentiometer to adjust the output voltage to about 5V.
3. Measure the output short-circuit current with the 10A current block of a multimeter, and adjust the constant current potentiometer to make the output current reach the predetermined charging current value;
4. The default shipping current of the charging lamp is 0.1 times the charging current (constant current value).
5. Adjust the constant voltage potentiometer to make the output voltage reach the float voltage;
6. Connect the battery and try charging.
(Steps 1, 2, 3, 4, and 5 are for the module input to connect to the power supply, and the output does not connect to the battery without load.)
★ LED constant current drive How to use:
1. Determine the operating current and high operating voltage you need to drive the LED;
2. Adjust the constant voltage potentiometer to adjust the output voltage to about 5V.
3. Measure the output short-circuit current with the 10A current block of a multimeter, and adjust the constant current potentiometer to make the output current reach the predetermined LED working current;
4. Adjust the constant voltage potentiometer to make the output voltage reach the LED high working voltage;
5. Connect the LED and test the machine.
(Steps 1, 2, 3, and 4 are to connect the module input to the power supply, and the output does not connect to the LED light without load.)

Product Description
1.Electrical characteristics
1). The maximum output current: 2 a
2). The input voltage: 2 v ~ 24 v
3). The maximum output voltage: 28 v
4). Efficiency: ＞93%
2.Mechanical properties
1). product size: 36 mm X 17 mm X 14 mm
3.Method of use
The module of the IN and - after 2~24v, IN adjusting the potentiometer can adjust output voltage, output voltage is greater than the input voltage
4.Matters needing attention
1). The input voltage should not exceed the maximum input voltage
2). The peak current output current is no more than TV university
When the module to adjust the output voltage may not always match the input voltage, please counterclockwise the potentiometer for more than 20 laps, and then use the module may be normal to adjust the voltage. Method of regulation: potentiometer on the front side of the chest, reverse clock amplifier!

Product Description
1.Electrical characteristics
1). The maximum output current: 2 a
2). The input voltage: 2 v ~ 24 v
3). The maximum output voltage: 28 v
4). Efficiency: ＞93%
2.Mechanical properties
1). product size: 36 mm X 17 mm X 14 mm
3.Method of use
The module of the IN and - after 2~24v, IN adjusting the potentiometer can adjust output voltage, output voltage is greater than the input voltage
4.Matters needing attention
1). The input voltage should not exceed the maximum input voltage
2). The peak current output current is no more than TV university
When the module to adjust the output voltage may not always match the input voltage, please counterclockwise the potentiometer for more than 20 laps, and then use the module may be normal to adjust the voltage. Method of regulation: potentiometer on the front side of the chest, reverse clock amplifier!

Description
Model name DC 5A High Current Buck power supply module
Module properties Non-isolated Buck
Rectification mode Non synchronous rectifier
Input voltage 5v-32v
Output voltage 0.8v-24v
Output current Peak 5A (3.5A above work to enhance heat dissipation)
Conversion efficiency Up to 90%
Switch frequency 300KHz
Output Ripple 30mV (no-load)
Load Adjustment Rate ± 0.5%
Voltage Adjustment Rate ± 2.5%
Working temperature -40℃ to 85℃.
Peripheral dimensions 43*21*14 (long * wide * high) (mm)
The use of high-power magnetic surround inductor and large current control chip, small size, large power, high efficiency.

Product Description
2 Channel Solid State Relay 1, the use of solid state relays, output with a resistive fuse 240V 2A.
2, Size: 55 * 33 * 25 (L * W * H)
3, input power: 5V DC (160MA)
4, the input control signal voltage:
0-1.5V state low level relay
5, blue KF301 terminal access control line more convenient

Customize R/C port:
RTS: Connect R/C port to RTS, it can flash ESP8266 module(such as: ESP-01 02 ... 12F)
CTS: Connect R/C port to CTS, it can flash Arduino boards(such as: Arduino pro mini)
Operating voltage:
5V (The max current depends on your USB port, usually 500mA)
3.3V (Using LDO, 300mA MAX)
Package Included:
1 x Wemos CH340G Breakout 5V 3.3V USB To Serial Module

Product parameters:
1. Ultra-micro volume: 23*24MM weight 0.45g
2. Excellent noise suppression, when the input audio is not connected, no noise can be heard when the ear is close to the speaker
3. Two-channel stereo, 5V power supply can output 5W 5W power, can directly drive 4Ω, 8Ω small speakers, with high output power, sufficient energy, good sound quality, with left and right channel volume adjustment.
4. The unique Class D digital power amplifier board without LC filter can be directly powered by the computer's USB.
5. Double-panel wiring, properly solve the ground potential balance and crosstalk between channels caused by wiring
6. Ultra-micro design, it can be easily placed in the small internal space of various digital products, and the magnification efficiency is super high.
7. All machines are used for the whole board welding, and the welding quality is comparable to non-manual iron welding!
8. The rated working voltage is 2.5-5V, and the ultimate working voltage is 5.5V.
Note: The "negative" of the left and right channel output terminals cannot be connected together, otherwise the IC will be burned, and the speaker (load) should be connected before power on.

Product Description
1) high-accuracy voltage detection circuit;
2) terminal of the charger using high voltage device;
3) Built-in three-stage over-current detection circuit (over-current 1, over-current 2, or load short circuit);
4) MOS transistor can control the battery charge and discharge;
5) low standby current consumption
Over charge voltage:4.25-4.35v±0.05v
Over dishcarge voltage: 2.3-3.0v±0.05v
Max continuous current:3A
Max peak current:5A
Working temperature:-40--- 50
Storage Temperature:-40-- 80
Small current:less than 3uA
Life cycle :more than 50000hours
Resistance:Less than 45m
Short cut protection :Protectable,charge can repair
Size: 36*6*1.0mm

Description:
NEO-6M GPS module with antenna and build-in EEPROM .This module is compatible with APM2 and APM2.5, and EEPROM can save all your configuration data.
Feature:
Voltage: 3.3 V-5 V
Size: 36mm * 24mm
Interface: RS232 TTL
Power: 3-5V
Baud rate default: 9600bps Without battery (it's not safety by air mail) The battery Model is MS621FE,Need to welding
You can download the test program directly from official website (u-center version 6.31 download(internet connection is required for installation.

Description:
NEO-6M GPS module with antenna and build-in EEPROM .This module is compatible with APM2 and APM2.5, and EEPROM can save all your configuration data.
Feature:
Voltage: 3.3 V-5 V
Size: 36mm * 24mm
Interface: RS232 TTL
Power: 3-5V
Baud rate default: 9600bps Without battery (it's not safety by air mail) The battery Model is MS621FE,Need to welding
You can download the test program directly from official website (u-center version 6.31 download(internet connection is required for installation.

LilyPad Coin Cell Battery Holder Module
This LilyPad Coin Cell Battery Holder has a small slide switch installed on the board, in-line with the power so you can shut off your project and save batteries. This slide switch is the same as is found on the LilyPad slide switch board, so it's not easy to accidentally turn off or on.
Just like the original Coin Cell Battery Holder, this simple board holds a 20mm coin cell battery (such as a CR2032) and gives you 4 connection points (two positive and two negative) for sewing into your project.
1×LilyPad Coin Cell Battery Holder Module

Features:
I2C interface
Power supply voltage: VM=15V max
Output current: Iout=1.2A(average) / 3.2A (peak)
Standby control to save power
CW/CCW/short brake/stop motor control modes

1. Stanby control mode
- I2Cmode: Control TB6612's STBY with I2C protocol
- IO mode:Control TB6612's STBY with "S" pin
2. Shield reset mode
- short: reset with d1 mini (reset at power on or press d1 mini's reset button)
- open: reset by "DTR" pin.
2. I2C address
- Short
x Open

Product introduction:
This product is a low-power Bluetooth design scheme, supports the latest Bluetooth 4.2 transmission, two-channel stereo lossless playback, after the module is connected to Bluetooth, Bluetooth wireless transmission can be quickly realized, which is very convenient. In an open environment, the Bluetooth connection distance can reach up to 20 meters.
It is widely used in various Bluetooth audio receivers, various audio DIY modification, etc.

Function Description:
Bluetooth V4.2 version, support Bluetooth automatic connection technology, support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo dual-channel output.
After the module is powered on, the mobile phone searches for the Bluetooth name HW-406, and it can play music after connecting to the Bluetooth;
Module blue indicator light:
When Bluetooth is not connected, the indicator light flashes quickly;
When the Bluetooth is connected, the indicator light is always on;
When Bluetooth is playing, the indicator light flashes slowly.

MH-M38:
1. 5V: power supply positive 5V
2. GND: negative pole of power supply
3. VBAT: Lithium battery anode 3.7-4.2V
4. L /L-: Left channel output (directly connected to the speaker)
5. R /R-: Right channel output (directly connected to the speaker)
1. Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can also connect to a 5V power supply or a 3.7V lithium battery. Note that the power supply interface of 5V and 3.7V is different, 5V is connected to 5V and GND, and 3.7V lithium battery is connected to VBAT and GND.
The maximum working current is 5V2A. It is recommended to use a 5V2A regulated power supply for better sound quality.
2. Support USB sound card, free drive (plug and play). Connect the module to the computer with a USB data cable, and the computer can play music and output through the module's amplifier
3. Audio output: output left and right channel stereo audio signals, which can be connected to two 2-8 ohm and 3-5W speakers respectively, and 4 ohm 5W speakers are recommended for storage.

4. This product has built-in dual 5W power amplifier circuit, and you must not use it with another power amplifier! The outputs of the two power amplifiers cannot be connected in parallel or the negative poles connected together, otherwise the power amplifier chip will be damaged.

Precautions
Signal interference: Bluetooth antennas are extremely susceptible to interference from high-frequency or strong electromagnetic signals, so please place them as far away as possible from wireless devices. And the board can not be close to metal objects, keep a certain distance.

If there is current noise on the power amplifier board, the cause is caused by ground wire interference. It is recommended that you do not use plug-in wires at the output of the Bluetooth module, but must be soldered, especially the ground wire, and the wire should not be too long, the shorter the better, and try Thicker. If the audio ground is at the grounding point of the power amplifier board, it needs to be connected to the ground of the audio input end of the power amplifier. This grounding point can be welded in different positions to achieve the lowest current sound. It is recommended that the Bluetooth and the power amplifier board be powered separately, and the Bluetooth ground and the power amplifier ground are isolated.

Since this product is a bare board design, try not to touch the components on the board with your hands, which will easily cause static electricity to kill the chip and cause burnout.

Product description:
Product Name: Digital audio amplifier board
Product Type: XH-M312
Power amplifier chip: TPA3118D2 * 1
Input voltage: DC12-28V, recommended DC24V
Power supply interface: DC socket (5.5 * 2.1)
Input current:> 3A
Output power: 45W * 2
Output impedance: 4-8ohm
Input impedance: 1KΩ
Signal to noise ratio: 100db
Magnification: 30TSP
Number of channels: two channels
Audio input: 3.5mm socket / xH2.54-3P
Size: 66 * 53MM
Product parameters:
Board power supply maximum range DC12-28V, recommended DC24V power supply. 12V power supply is the output power of 20W per channel, 24V power supply is the output power up to 45W per channel.
The new original IC chip with overvoltage protection, overcurrent protection, overheating protection, short circuit protection, audio output 5mm pitch 2P terminal, can be connected to double 30W speakers.

Description
ATTINY85-20PU DIP-8 feet in-line pluggable
Development Programming Board ATtiny13A / ATtiny25 / ATtiny45 / ATtiny85 Pluggable Development Programming Board

Factory direct sales convenient and quick programming

Development board support chip ATtiny13A / ATtiny25 / ATtiny45 / ATtiny85 and so on

Note: shipped without ATtiny microcontroller chip, need a chip please ask yourself to buy.

Note: There is no technical support for the empty board adapter

Component list
Ceramic capacitor 0.1uf (104) 2pcs: C1, C2
1/8W resistor 1K 4pcs: R1, R2, R5, R6
1/8W resistor 1M 2pcs: R3, R4
NPN transistor 9013 2pcs: Q1, Q2
Battery holder CR2032 2PCS: BT1, BT2
Screw M2*10 1pcs
Knurled copper pillar M3*4 1pcs
Knurled copper pillar M*24 1pcs
PCB diameter 52mm
Features
1.The circuit consists of a triode multivibrator driving two groups of LEDs to flash alternately. When the LED gyro is rotated, the vibration switch is turned on and the circuit works. Due to the phenomenon of visual retention, the pattern is left.
2.The working principle of the circuit: when the battery is installed, the vibration switch S1 is turned off. When the gyro is rotated, due to the centrifugal effect, the vibration switch S1 is turned on and the circuit works.
3.The working principle of the multivibrator is that when the power is turned on, the transistors Q1 and Q2 should be turned on first. Due to the difference of components, only one is turned on first, and then the two transistors in the circuit are turned on and off in turn, and the cycle Glow, so there will be multiple dashed patterns.
4.It can not only develop skills for welding learning, but also complete a funning LED flashing light toy to bring fun to life.
5.Required tools: electric iron: 30W, solder wire: 0.8mm, tweezers, oblique pliers, multimeter.

Describe
After the power is turned on, it will automatically enter the pairing mode, search and display the device name: SANWU Audio (customized device name can be provided for bulk demand)
Power supply: 2.1 interface DC 8~25V power supply (input with reverse polarity protection)
Audio input: various versions of Bluetooth connection stereo input, using CSR8635 Bluetooth chip, Bluetooth V4.0, extremely high software compatibility
Output impedance: 8 ohms (can drive 4, 6, 8, 16 ohm impedance speakers)
Output power: Join the pre-stage 5532 output power is 25W 25W
The DIP switch can be more convenient to directly adjust the gain of the power amplifier of the later stage, and better promote the loudspeaker with larger damping.

Features:
Adopts two high quality TPA3116D2 digital amplifier chips.
Sound quality is very good, high efficiency and amplifying power.
50W*2 100W 2.1 channels(left/right channel and subwoofer channel), high efficiency and low-heat.
Powered by DC 12-24V, wide input voltage.
User can adjust the volume by themselves easily.
Applicable speaker impedance: 4-8 ohm.
Just connect the power supply and loudspeaker box, enjoy the pure digital music!

Notice:
This amplifier board must be powered by DC power(DC12-24V), it's better to use high-performance switch power. Don't use transformer!

Specifications:
Supply Voltage: DC 12-24V
Chip: TPA3116*2
Channel Type: 3 Channels(Left Channel, Right Channel, Subwoofer)
Output Power: 50W*2 100W*1 Subwoofer
Output Match: 4-8 ohm
Audio Output: Terminals
Frequency Response Range: 14-100KHz
SNR: 100dB
Switching Frequency: 1.2MHz
PCB Board Size: 100 * 70 * 30mm / 3.94 * 2.75 * 1.18in (L * W * H)
Package Size: 13.5 * 11 * 5cm / 5.31 * 4.33 * 1.97in (L * W * H)

Package List:
1 * 2.1 Channel Audio Amplifier Board

Product Introduction
DY-40 is developed by 2.4G technology, with a distance of 120 meters. It uses serial communication interface, which is simple and quick to use. You can apply JDY-40 to products only needs to know the knowledge of serial port.
Technical Parameter
Application Scene
2.4G panel switch
2.4G remote controller
2.4G transparent transmission
Mobile phone one-to-many control
IO switching control
2.4Gtoys
Application of intelligent home control
JDY-40 Pin Definition

Dimensional Drawing
Default Configuration
AT Instruction Set
AT instruction instructions
In particular, the JDY-40 module sends the AT instruction need to end the symbol \r\n

JDY-40 Application Wiring Diagram
Serial port transparent transmission application circuit diagram
It can be applied to MCU and MCU wireless serial port transparent transmission, instrument and electronic toys.
Mobile phone one-to-many control
It can be applied to mobile phone one-to-many control, mobile phone one-to-many transparent transmission, mobile phone one-to-many application of intelligent furniture control.
Switching control 1
It can be applied to: the 2.4G remote controller with 8 IO can be applied to the remote control key and support the low function, two 7th batteries can be used for at least one year, application of low power consumption switch panel in intelligent home, and 2.4G toy application.
Switching control 2
It can be applied to: the 2.4G remote controller with 7 IO can be applied to the remote control key and support the low function, two 7th batteries can be used for at least one year, application of low power consumption switch panel in intelligent home, and 2.4G toy application.
Switching control 3
It can be applied to: the 2.4G remote controller with 8 IO can be applied to the remote control key and support the low function, two 7th batteries can be used for at least one year, application of low power consumption switch panel in intelligent home, and 2.4G toy application.

Product Features
· Input voltage range: 6V-32V
· Output voltage: default 5V, automatically adjust between 3-12V after triggering fast charge
· Output power: up to 24W (5V/3.4A, 9V/2.5A, 12V/2A, etc.)
· Output voltage cable compensation function
· Conversion efficiency: 90% -97%
· Support multiple fast charging protocols
· Input overvoltage and undervoltage protection
· Input overcurrent protection
· Output overcurrent, short circuit protection
· Machine over temperature protection
Support fast charge agreement
· Support DCP protocol, BC1.2, Apple, Samsung protocol
· Support Huawei Fast Charge Protocol FCP/SCP
· Support Huawei Fast Charge Protocol AFC
· Support Spreadtrum Fast Charge Protocol SFCP
· Support Qualcomm QC2.0 and 3.0
· Support MTK PE1.1/PE2.0
Applications
· Solar panel to mobile phone charging
· Car charging retrofit
· Driving recorder power supply
· Home power supply, smart plug modification
· Fast charge adapter
Dual-port independent output, support protocol: QC2.0, QC3.0, MTK PE1.1/2.0, FOR Apple, FOR Samsung AFC,FOR Huawei FCP, FOR Spreadtrum SFCP
Input voltage: DC 6~30V
Output voltage: default 5V, adjust range 3~12V according to fast charging protocol
Output capacity: single-port rated current 2.4A, rated power 24W
Protection measures: Output overvoltage protection, limit the output voltage does not exceed 13V (in the case of chip failure); input with a fuse.

Product Features
· Input voltage range: 6V-32V
· Output voltage: default 5V, automatically adjust between 3-12V after triggering fast charge
· Output power: up to 24W (5V/3.4A, 9V/2.5A, 12V/2A, etc.)
· Output voltage cable compensation function
· Conversion efficiency: 90% -97%
· Support multiple fast charging protocols
· Input overvoltage and undervoltage protection
· Input overcurrent protection
· Output overcurrent, short circuit protection
· Machine over temperature protection
Support fast charge agreement
· Support DCP protocol, BC1.2, Apple, Samsung protocol
· Support Huawei Fast Charge Protocol FCP/SCP
· Support Huawei Fast Charge Protocol AFC
· Support Spreadtrum Fast Charge Protocol SFCP
· Support Qualcomm QC2.0 and 3.0
· Support MTK PE1.1/PE2.0
Applications
· Solar panel to mobile phone charging
· Car charging retrofit
· Driving recorder power supply
· Home power supply, smart plug modification
· Fast charge adapter
Dual-port independent output, support protocol: QC2.0, QC3.0, MTK PE1.1/2.0, FOR Apple, FOR Samsung AFC,FOR Huawei FCP, FOR Spreadtrum SFCP
Input voltage: DC 6~30V
Output voltage: default 5V, adjust range 3~12V according to fast charging protocol
Output capacity: single-port rated current 2.4A, rated power 24W
Protection measures: Output overvoltage protection, limit the output voltage does not exceed 13V (in the case of chip failure); input with a fuse.

Product Features
· Input voltage range: 6V-32V
· Output voltage: default 5V, automatically adjust between 3-12V after triggering fast charge
· Output power: up to 24W (5V/3.4A, 9V/2.5A, 12V/2A, etc.)
· Output voltage cable compensation function
· Conversion efficiency: 90% -97%
· Support multiple fast charging protocols
· Input overvoltage and undervoltage protection
· Input overcurrent protection
· Output overcurrent, short circuit protection
· Machine over temperature protection
Support fast charge agreement
· Support DCP protocol, BC1.2, Apple, Samsung protocol
· Support Huawei Fast Charge Protocol FCP/SCP
· Support Huawei Fast Charge Protocol AFC
· Support Spreadtrum Fast Charge Protocol SFCP
· Support Qualcomm QC2.0 and 3.0
· Support MTK PE1.1/PE2.0
Applications
· Solar panel to mobile phone charging
· Car charging retrofit
· Driving recorder power supply
· Home power supply, smart plug modification
· Fast charge adapter
Dual-port independent output, support protocol: QC2.0, QC3.0, MTK PE1.1/2.0, FOR Apple, FOR Samsung AFC,FOR Huawei FCP, FOR Spreadtrum SFCP
Input voltage: DC 6~30V
Output voltage: default 5V, adjust range 3~12V according to fast charging protocol
Output capacity: single-port rated current 2.4A, rated power 24W
Protection measures: Output overvoltage protection, limit the output voltage does not exceed 13V (in the case of chip failure); input with a fuse.

Features:
Amplifier is 30--4000MHz (40dB
Amplifier parameters indicators:
Operating Frequency: 30-4000MHz
Amplifier Gain: 40dB
Maximum output power: 20dBm (100mW) @ 1dB compression point
Operating Current: 135mA (5V)
Supply voltage: 5VDC
System Impedance: 50 ohms