Elektronikus alkatrészek és félvezetők

1pcs Acoustic Loudspeaker 4R 3W 40MM Speaker 36MM External Magnetic Black Hat PU Edge

DIY mobile power/power bank circuit board
 
Product Features:
1.4 LED lights display power, intelligent automatic shutdown in non-working state;
2. Built-in lithium battery protection IC, with over-current, over-voltage, and under-voltage protection;
3. Dual USB output;
4. Motherboard size: thickness 8mm*width 32mm*length 69mm.
Basic product parameters:
Input port: MicroUSB (Android port)
Input requirements: 5V constant voltage power supply can be used as charging input power supply, the most matching charger is above 5V1A
Output port: USB
Output parameters: 5V1A/5V2A
 
Requirements for rechargeable batteries:
Usable battery: 18650 battery, mobile phone battery, tablet battery, MP3 battery, etc. 3.7V-4.2V polymer lithium battery, which can be powered by a single cell (slice) or multiple cells (slices) in parallel (series connection is not supported, not in series) ). (Note: Parallel connection increases capacity, series connection increases voltage, so it can only be used in parallel!)
You can connect 2-6 18650 batteries in parallel! ! !
Unusable batteries: dry batteries, accumulators, 1.2V rechargeable batteries, nickel-hydrogen batteries, 3.2V iron-lithium polymer lithium batteries, etc.
 
Pay attention to the following points when installing the product:
1. The batteries must be connected in parallel, and the voltage must be between 3.2-4.2V to work. Both 18650 flat-head and polymer batteries can work;
2. The battery is positively connected to the motherboard B and negatively connected to B-, the motherboard will burn if installed;
3. New and old batteries, batteries with different models and brands cannot be mixed.

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The board is 1.5mm thick, 65mm long and 27mm wide. The pads are large, the wires are thick, and the components are beautifully laid out. The circuit uses sound to control 11 LEDs to illuminate water, suitable for assembly, skill training, assembly competition, etc.
This kit is a very intuitive display of the functions of the CD4017 and is a suite for learning counters, crossovers, and lantern controllers. At the same time, the kit has great effects, is very interesting and practical, and is also the preferred material for beginners to get started.
The circuit board is a glass fiber tin plate
Circuit function: 10 LEDs emit light with the sound size and high and low circulating water circulation. The louder the sound, the faster the water flow speed. The L11 flashes once every cycle, which can display the function of 4017 visually.
Working voltage: 4V--12V can be, the higher the voltage, the brighter the LED will be.

Function: Use one ADC to collect 16 analog signals.
16-channel analog signal switch using CD74HC4067
Analog signal input: C0-C15 16 channels
Analog output: DIG
Channel control: S0-S3
 
Description: This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. This chip is like a rotary switch - it internally routes the common pin (COM in the schematic, SIG on the board) to one of 16 channel pins (CHANxx). It works with both digital and analog signals (the voltage can’t be higher than VCC), and the connections function in either direction. To control it, connect 4 digital outputs to the chip’s address select pins (S0-S3), and send it the binary address of the channel you want (see the datasheet for details). This allows you to connect up to 16 sensors to your system using only 5 pins!
Since the mux/demux also works with digital signals, you can use it to pipe TTL-level serial data to or from multiple devices. For example, you could use it to connect the TX pins of 16 devices to one RX pin on your microcontroller. You can then select any one of those 16 devices to listen to. If you want two-way communications, you can add a second board to route your microcontroller’s TX line to 16 device’s RX lines. By using multiple boards, you can create similar arrangements for I2C, SPI, etc.
The internal switches are bidirectional, support voltages between ground and VCC, have low “on” resistance and low “off” leakage, and to prevent crosstalk, perform “break-before-make” switching. The board also breaks out the chip’s “enable” pin, which when driven high, will completely disconnect the common pin (all switches “off”).
 
Features:
2V to 6V operation
“On” resistance: 70 Ohms @ 4.5V
6ns break-before-make @ 4.5V
Wide operating temperature range: -55C to 125C

1, product description
The Keyes BH1750FVI Digital Illumination Sensor Module is a digital light intensity sensor IC for a two-wire serial bus interface. The brightness of the LCD and keyboard backlights can be adjusted using the light intensity data collected by the module. The module resolution can detect a wide range of light intensity changes.
2, parameters
1, outer diameter 26mm, large diameter 28.5mm, high 26MM (plus light ball)
2, working voltage: DC5V
3. Communication interface: I2C
4, input light range: 1-65535lx
5, spectral sensitivity characteristics: peak sensitivity wavelength typical value: 560nm
6. Light source dependence is weak: incandescent lamp, fluorescent lamp, halogen lamp, white LED, fluorescent lamp

If you've ever tried to connect a 3.3V device to a 5V system, you know what a challenge it can be. bi-directional logic level converter is a small device that safely steps down 5V signals to 3.3V AND steps up 3.3V to 5V at the same time. This level converter also works with 2.8V and 1.8V devices. What really separates this Logic level converter from our previous versions is that you can successfully set your high and low voltages and step up and down between them safely on the same channel. Each level converter has the capability of converting 4 pins on the high side to 4 pins on the low side with two inputs and two outputs provided for each side.
 
The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the HV' pin, low voltage (3.3V for example) to LV', and ground from the system to the GND' pin.
Dimensions:0.63 x 0.52" (16.05 x 13.33mm)
Documents:
Schematic
Eagle Files
Datasheet (BSS138)
Hookup Guide
GitHub
Product Video
Package Include

product details
✅Plug and play-Our upgraded DC power plug saves time and makes cable connections more secure. This is a perfect solution for those who want to make custom power cords.
✅PUSH BUTTON DESIGN-Our DC power jack connector is innovatively designed, no screwdriver is needed, and the wire can be inserted just by pressing the button with your finger, and has efficient and stable transmission.
✅High quality-We use high-end materials to provide the best polarity connection and insulation to ensure excellent connection performance. Each item is tested before shipment and is 100% working properly.
✅Application equipment-Our 5.5 X 2.1mm cylindrical DC plug is generally suitable for CCTV surveillance cameras, LED light bars and other 2.1 X 5.5mm DC power supply equipment. Very versatile.

product details
✅Plug and play-Our upgraded DC power plug saves time and makes cable connections more secure. This is a perfect solution for those who want to make custom power cords.
✅PUSH BUTTON DESIGN-Our DC power jack connector is innovatively designed, no screwdriver is needed, and the wire can be inserted just by pressing the button with your finger, and has efficient and stable transmission.
✅High quality-We use high-end materials to provide the best polarity connection and insulation to ensure excellent connection performance. Each item is tested before shipment and is 100% working properly.
✅Application equipment-Our 5.5 X 2.1mm cylindrical DC plug is generally suitable for CCTV surveillance cameras, LED light bars and other 2.1 X 5.5mm DC power supply equipment. Very versatile.

product details
✅Plug and play-Our upgraded DC power plug saves time and makes cable connections more secure. This is a perfect solution for those who want to make custom power cords.
✅PUSH BUTTON DESIGN-Our DC power jack connector is innovatively designed, no screwdriver is needed, and the wire can be inserted just by pressing the button with your finger, and has efficient and stable transmission.
✅High quality-We use high-end materials to provide the best polarity connection and insulation to ensure excellent connection performance. Each item is tested before shipment and is 100% working properly.
✅Application equipment-Our 5.5 X 2.1mm cylindrical DC plug is generally suitable for CCTV surveillance cameras, LED light bars and other 2.1 X 5.5mm DC power supply equipment. Very versatile.

product details
✅Plug and play-Our upgraded DC power plug saves time and makes cable connections more secure. This is a perfect solution for those who want to make custom power cords.
✅PUSH BUTTON DESIGN-Our DC power jack connector is innovatively designed, no screwdriver is needed, and the wire can be inserted just by pressing the button with your finger, and has efficient and stable transmission.
✅High quality-We use high-end materials to provide the best polarity connection and insulation to ensure excellent connection performance. Each item is tested before shipment and is 100% working properly.
✅Application equipment-Our 5.5 X 2.1mm cylindrical DC plug is generally suitable for CCTV surveillance cameras, LED light bars and other 2.1 X 5.5mm DC power supply equipment. Very versatile.

product details
✅Plug and play-Our upgraded DC power plug saves time and makes cable connections more secure. This is a perfect solution for those who want to make custom power cords.
✅PUSH BUTTON DESIGN-Our DC power jack connector is innovatively designed, no screwdriver is needed, and the wire can be inserted just by pressing the button with your finger, and has efficient and stable transmission.
✅High quality-We use high-end materials to provide the best polarity connection and insulation to ensure excellent connection performance. Each item is tested before shipment and is 100% working properly.
✅Application equipment-Our 5.5 X 2.1mm cylindrical DC plug is generally suitable for CCTV surveillance cameras, LED light bars and other 2.1 X 5.5mm DC power supply equipment. Very versatile.

product details
✅Plug and play-Our upgraded DC power plug saves time and makes cable connections more secure. This is a perfect solution for those who want to make custom power cords.
✅PUSH BUTTON DESIGN-Our DC power jack connector is innovatively designed, no screwdriver is needed, and the wire can be inserted just by pressing the button with your finger, and has efficient and stable transmission.
✅High quality-We use high-end materials to provide the best polarity connection and insulation to ensure excellent connection performance. Each item is tested before shipment and is 100% working properly.
✅Application equipment-Our 5.5 X 2.1mm cylindrical DC plug is generally suitable for CCTV surveillance cameras, LED light bars and other 2.1 X 5.5mm DC power supply equipment. Very versatile.