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Features:
This is a DC-DC step down converter module that convert 3.2V~35V to 1.25V~35V, maximum current is 3A.
converter module is used for voltage step-down so please make sure that input voltage is at least 1.5V higher than output voltage.
The module can be remarkably efficient (maximum 92% ), making it useful for voltage step-down.
Current of less than 2.5A is suggested for long time working; enhance heat dissipation if more than 2A(output >10W).
Widely used for low voltage system power supply 6V, 12V, 14V, 24V battery charging and regulated power supply.
Specifications:
Input Voltage: 3.2V~35V
Output Voltage: 1.25V~35V
Output Current: 3A (Max.)
Efficiency: 92% (Max.)
Output Ripple: <30mV
Switch Frequency: 65KHz
Operating Temperature: -45℃~ 85℃
Size: 43*21*14mm/1.69*0.82*0.55"
Package Includes:
2 x Modules

Features:
100% brand new and high quality
Input voltage 3.3-6V, output 3.3V (deviation -5% )
Long time maximum output current 500mA
Short time maximum output current 700mA
Mini DC DC conversion module, working frequency 1.2Mhz, conversion efficiency 80-93%
Specification:
Input voltage 3.3-6V, output 3.3V (deviation -5% )
Long time maximum output current 500mA
Short time maximum output current 700mA
Conversion efficiency : 80-93%
The maximum input voltage can not exceed 6.5V
Weight:Weight: Approx.1g/0.1oz
INPUT 3.7V/600MA; OUTPUT 3.3V/550MA
INPUT 4V/600MA; OUTPUT 3.3V/610MA
INPUT 4.2V/580MA; OUTPUT 3.3V/600MA
INPUT 4.5V/550MA; OUTPUT 3.3V/620MA
INPUT 5V/470MA; OUTPUT 3.3V/590MA
INPUT 6V/370MA; OUTPUT 3.3V/550MA
Package list:
1 x Power Supply Converter
Attention:
This is a DC-DC voltage converter module,Must be noted when using:
1. Input voltage can not be greater than the maximum input range
2. Output power can not be greater than the maximum load for a long time
3. Input power must be greater than the output power, because the power consumption of the module itself

Features:
With voltmeter display, voltmeter error ± 0.1V, range 0 ~ 40V.
the button to switch the measurement input or output voltage, and the indicator light shows which voltage is being measured, and keep the last setting, even if it is powered off and then on.
The voltmeter can be turned off by pressing and holding the switch for more than 1 second and less than 4 seconds.
With terminal block, no soldering iron can be used conveniently, and the wire bonding point is retained. The input voltage is 4.0~40V (the input voltage must be higher than the voltage to be output by more than 1v.).
Adjustable output voltage range from 1.25V to 37V continuously adjustable (input voltage must be higher than the voltage to be output by more than 1V).
The maximum output current can be as high as 3A, and the common stable operating current is 2A.
Using 150KHz internal oscillation frequency, it belongs to the second generation of switching voltage regulator, with low power consumption and high efficiency.
Specification:Material:Epoxy Resin
Voltage Meter :Error -0.1V;Measuring Range:0~40V
Input Voltage:4~40V
Adjustable Output Voltage:1.25~37V
Maximum Output Current: 3A
Stable Current: 2A
Internal Oscillation Frequency: 150KHz
Package List:1*LM2596 Module
Users Manual:Input and output voltage measurement error calibration function, long press the switch for more than 4 seconds, after entering the hand, it will enter the voltage measurement error calibration function.
At this time, the in light is on (calibration input terminal), and the digital tube flashes to display the correction value (factory parameter is 0.0) At this time, press the button to change this value (the value range is -0.5~0.5, the unit is V), the positive number means upward calibration, and the negative number means downward calibration.
After adjusting the comparison value of the input end, press and hold the button for more than 2 seconds, then release the error calibration after the release, then the out light is on (calibration output), and the calibration value of the output is displayed.
The adjustment method is the same as the input. After the comparison value at the output end, press and hold the button for more than 2 seconds. After releasing the hand, save the set value and return to the normal display voltage. The set correction value takes effect immediately and the power is not lost.
Note:
The input voltage is lower than 4V, the onboard voltmeter does not work and does not display.

Description:
The main characteristics of diode is one-way electrical conductivity, which is under the action of forward voltage, conduction resistance is small; While under the effect of reverse voltage, resistance is great or infinite.Because of the above properties, diode is often used in the rectifier circuit, isolation, voltage regulator, polarity protection, coding modulation, frequency modulation and static noise control circuits in car.
Features:
Eco-friendly and unleaded, harmless
High voltage and good performance
Low forward voltage drop
Low reverse leakage current
High current capability
Specifications:
Model: 10A10
Reverse Voltage Spike: 1000V
Average Current: 10A
Total Length: 5.8cm / 2.28"
Diameter: 0.85cm / 0.33"
Quantity: 50
Weight: 89g(approx.)
Package Includes:50 x Diodes
Note:1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding.
2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.
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Feature:1. Pure copper electrical conductor has good electrical conductivity, low resistivity, electroplated to prevent oxidation.
2. The housing is made of flame retardant insulated material, long life, anti-aging, resistant to high temperature and voltage.
3. M3 screw mounting hole.
4. Easily complete wiring, just push up the lever and insert the stripped wire.
5. Compact and lightweight, can be used repeatedly.
Specification:
Item Type: Terminal Block
Material: Nylon Copper
Rated Voltage: 250V-4KV
Rated Current: 32A
Rated Power: 7KW
Applicable Wire Diameter: Soft and hard wire 0.08-4.0mm2 (AWG28-15)
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Package List:5 x Terminal Block

Features:
The MP3 decoder board is based on the VLSI VS1053B design. With this board you can insert MEGA directly without the need to connect jumpers.
Playing music is easier than with a small mp3 distributor board.
The VS1053B is a versatile MP3 codec processor capable of decoding a variety of music formats, including Ogg Vorbis / MP3 / AAC / WMA / MIDI Audio.
For the best headphone listening experience, the VS1053B includes the EarSpeaker space to accurately simulate the sound of a room with stereo speakers.
In addition to being able to decode all major formats, the VS1053B supports OGG real-time encoded recording.
Equipped with a memory card slot for storage room extension.
With serial peripheral interface,all control signal cord is lead out.
Specification:Earphone and Loudspeaker Output Interface:1
Microphone for Recording:1
Line-in Input Interface:1
Power Indication Light:Yes
Chip: -1117 3.3V/2.5V
Maximum Provided Current: 800mA
Single Power Supply: 5VDC,Capacitor Filtering
Oscillator: 12.288Mhz
Size:6 x 5.7cm / 2.36 x 2.24in
Package List:1 x MP3 Music Board

Feature:1. This set of blades is made of high-quality steel material and is durable.
2. Designed to remove glue / pry chips / cut pads, allowing you to remove the edge glue and remove the core safely.
3. This set of tool knives can be used to remove glue from the hard disk CPU.
4. The blades are soft and hard, and they feel very good, allowing you to easily operate them on the motherboard.
5. This set of blades is ultra-thin and soft, and they are not easy to deform.
Specification:
Item Type: Phone Repair Tool
Material: Steel
Blade Thickness: Approx. 0.3mm
Gross Weight: Approx. 9.00g
Packing Size: Approx. 20.00 x 11.00 x 3.00cm / 7.9 x 4.3 x 1.2 inch
Configuration: 16 Cutter Heads 1 Handle
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Package List:1 x Set of Pry Tool

Descriptions:
TLV3501 is a single-channel high-speed push-pull output comparator, delay is 4.5ns, supply voltage: 2.7V to 5.5V, has exceeded swing input common-mode range makes it ideally suited for low voltage applications. Rail-to-rail output can directly drive a CMOS or TTL logic. This module can be for a wide range of voltage signal shaping period, as the frequency, phase difference time domain measurements and other front-end conditioning module, can be used as the 2015 National Undergraduate Electronic Design Contest F digital frequency meter title front-end module.
Features:
TLV3501 is a single-channel high-speed push-pull output comparator, delay is 4.5ns, supply voltage: 2.7V to 5.5V.
This module can be for a wide range of voltage signal shaping period, as the frequency, phase difference time domain measurements and other front-end conditioning module.
Rail-to-rail output can directly drive a CMOS or TTL logic.
Without threshold setting, the sine wave, wave and triangular wave can be transformed into wave, which can be used easily without debugging.
At the same time, it has great extensibility, just change a small amount of the original.
Specifications:
Power supply voltage: 2.7-5VDC
Input voltage: 8-1000mV (effective value)
Output level: rail to rail output, can directly drive TTL/CMOS level
Input frequency: 1Hz-- 120MHz, Min.1Hz
Interface form: SMA female head (external screw hole)
Input impedance: 20K ohm
Size: 5 x2.5cm/1.96 x 0.98inch
Weight: 8g
Product Use:1. Sine wave to wave
2. The -crossing comparator
3. Universal comparator
Package Included:
1 x Frequency Meter Front Shaping Module

Features:
Electrical parameter measurement function (voltage, current, active power, energy).
Overload alarm function (over power alarm threshold, backlight and power flashing to alarm).
Power alarm threshold preset function (can set power alarm threshold).
The reset function of energy key.
Store data when power off.
Backlight function, short press the key to turn on or off the backlight, the backlight has memory function, it can store the on or off state when power off.
Display interface is large-screen LCD, it can display voltage, current, power, energy parameters at the same time.
Specifications:
Brand: PEACEFAIR
Model: PZEM-021
Working Voltage: 80~260VAC
Test Voltage: 80~260VAC
Rated Power: 20A/4500W
Operating Frequency: 45-65Hz
Measurement Accuracy: 1.0 grade
Power Test Range: 0~4.5kW (within 1KW, the display format is 0.0~999.9W; 1KW and above, the display format is 1000~4500W.)
Energy Test Range: 0~9999kWh (within 10KWh, the display format is 0~9999Wh; 10kWh and above, the display format is 10~9999kWh.)
Voltage Test Range: 80~260V
Display Format: 80~260V
Current Test Range: 0~20A
Display Format: 0.00~20.00
Weight: 84g(approx.)
Package Includes:
1 x Meter

Special pyramid shape: Not only beautiful; can effectively absorb high school low frequency sound; remove reverberation; make the sound become more energetic. for control rooms; mixing rooms; listening rooms; home theaters.
Features:
1. Color can be selected by yourself; splicing is simple; utility knife portable cutting; style.
2. Multiple functions: Sound absorption; noise reduction; sound quality improvement; acoustic diffusion; decoration.
3. Good for recording studios, booths, home theaters
4. Light weight soundproof foam easy can be applied on ceilings. Soft / flexible - great for sound proof .
5. Our foam is very easy to , just use a hand vacuum on a low setting to remove any dust accumulation.
6. Can help increase sound clarity in a room or space. Great use for media content.
7. High density, fireproof, non-flammable.
Specification:
Condition: 100% brand new
Material:Polyurethane
Weight: Approx.70g
Size:(approx)
50*50*5cm/19.6*19.6*1.96inch
Color:Yellow,red,black(optional)
Package include:
6*soundproof foam
Note:
1. Please allow slight error due to manual measurement. Thanks for your understanding.
2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.

Torch Melting Kit Gold & Silver Crucible Tong Rod Graphite Ingot Mold Accessory
Features:
Choice the fused silica as the main material, made using modern ceramic processing technology.
Mainly used in dental alloys, platinum, gold,silver, copper brass and other high temperature melting alloys.
High temperature over 2800 degrees.
High purity and high strength, durable in use.
High heat resistant, high shock resistance and corrosion resistance.
Specifications:
Crucible Tongs
Material: stainless steel
Overall Length: 25cm/10inch
Color: silver
Net Weight: 310g
Cylindrical Graphite
Outer Dia.:40 mm/1.57inch
Inner Dia.:30 mm/1.18inch
Total Height:40 mm/1.57inch
Inner Height:35 mm/1.38inch
Square Graphite
Bulk density ≥1.82 g/cm3
Electric resistivity ≥9 μ Ω m
Bending strength ≥45 Mpa
resist compression ≥65 Mpa
Ash ≤0.1 %
particle ≤43 um（0.043 mm）
Size: 7.2 x 5.7 x 1.2cm/0.28 x 0.22 x 0.05inch
Quartz Melting Crucible
Capacity: 150g
Material: Quartz
Outer Diameter: 57 mm/2.24inch
Inner diameter: 43 mm/1.69inch
Height: 20mm/0.79inch
Depth: 15mm/0.59inch
Net weight: approx. 40g
Package Included:
1 x Quartz Melting Crucible
1 x Tongs
1 x Square Graphite
1 x Cylindrical Graphite
Note:Manual measuring, please allow 1 ~ 3 cm error, thank you.

SL Screwdriver Bit Durable PH Screwdriver Bit Practical for Industry Furniture
Features:1. Made of high quality steel, high hardness, better wear resistance.
2. The product is heat treated and has a longer service life.
3. Exquisite workmanship, each edge can lock screws accurately , no damage to the screw.
4. The use of the most advanced technology, the design of waist which can enhance the durability of the screwdriver bits.
5. 108pcs screwdriver bits with various models, can meet different using needs.
Specification:Condition: 100% Brand New
Item Type: Screwdriver Bit
Material: -V Steel
Specifications: 1/4 inch 6.35MM hex handle
Model: PZ1 / PZ2 / PZ3 / / H5 / H6 / TX10 / TX15 / TX20 / TX25 / TX30 / TX40 / PH1 / PH2 / PH3 / SL4,5 / SL6 / SL7
Quantity: 108PCS
Package List:108 * Screwdriver Bit

Feature:1. It reduces mechanical wear, ensures stable engine operation and improves reliability.
2. Its role is to filter out moisture in the fuel system of the engine to protect various accessories.
3. The of water can rust, wear, jam, and even worsen the combustion process of , which is extremely harmful to the fueling system.
4. Easy to install and reliable performance, the model number is 7023589 SN 40754.
5. Based on the original factory specifications, a direct replacement for the old or broken one.
Specification:
Condition: 100% Brand New
Item Type: Fuel Filter
Material: ABS
Color: As Pictures Shown
Model: 7023589 SN 40754
Application: Construction Machinery
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Package List:1 x Filter
Note:
1. Please double check the part number of your item, matching information is for reference only.
2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!

Features:
With voltmeter display and voltmeter self-calibrating. A more advanced voltage microprocessor is used, the voltmeter error is ±0.05V, and the range is 0-40V(To the accuracy of the voltmeter, please that the input voltage is above 4.5V).
Touch the button to switch the measurement input or output voltage, and indicator light will show which channel voltage is being measured, and save the settings, even if it is powered off and then on.
When you are not using the voltmeter, you can touch the left button to turn off the voltmeter.
Input voltage 4.0-40V, 1.25V-37V output voltage range is continuously adjustable (input voltage must be 1.5V higher than the output voltage).
Output power 20W, output current 3A, it is recommended to use within 2.0A, high current or more than 15W need to strengthen heat dissipation.
High conversion efficiency, averaging 88% (efficiency related to input, output voltage, current, voltage difference).
It has overheat protection and short circuit protection, with reverse connection protection, will not burn the motherboard.
Specification:Material:
Size: Approx. 6.1x3.4x1.2cm/2.40x1.34x0.47inch
Weight: Approx. 22g
Application Range:This module can be applied to the step-down field where the input voltage is higher than the output voltage, such as battery, power transformer, DIY adjustable power supply, 24V car laptop power supply, industrial equipment step-down, 12V to 3.3V, 12V to 5V, 24V to 5V, 24V to 12V, 36V to 24V, etc.
Onboard Voltmeter Self-Calibration Method:When the on-board voltmeter displays the output voltage, press and hold the right button for 2 seconds to release, and the voltmeter and output voltage indicator OUT flash synchronously0, at this time, the output voltage adjustment mode is entered. Similarly, when the voltmeter displays the input voltage, long press the right button for 2 seconds and then release, the voltmeter and the input voltage indicator IN flash synchronously, then enter the input voltage adjustment mode.
Lightly touched the right button, the voltage rises by one unit, lightly touched the left button, the voltage is reduced by one unit. Since the voltage value of one unit is less than 0.1V, you need to press 1-5 times continuously to see the voltmeter change 0.1V, the number of consecutive key presses depends on the currently displayed voltage value. The higher the current display voltage, the less the number of presses.
After the voltage adjustment is completed, long press the right button for 2 seconds and then release, then the voltage calibration mode can be exited, and all parameter settings are automatically powered down.
Package List:1 x Module
Note:This adjustment method allows you to obtain accurate voltage values over the entire voltage range with only one calibration. This feature is designed to meet your higher accuracy requirements.

Feature:
Type: Solder Type Socket
Use: DIP IC Socket
8 Value Total: 66pcs
Product includes:
18 x 6 pins-DIP IC Sockets
12 x 8 pins-DIP IC Sockets
6 x 14 pins-DIP IC Sockets
6 x 16 pins-DIP IC Sockets
6 x 18 pins-DIP IC Sockets
6 x 20 pins-DIP IC Sockets
6 x 24 pins-DIP IC Sockets
6 x 28 pins-DIP IC Sockets
Package contains:1 X 66pcs DIP IC Sockets Adaptor Solder Type Socket Kit