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PAM8403 is a 3W, class-D audio amplifier.

Offers low THD+N allowing it to achieve high-quality sound reproduction.

New filterless architecture allows the device to drive the speaker directly. 

Requiring no low-pass output filters.

Saving system cost and PCB area.

Efficiency of the PAM8403 is much better than that of Class-AB cousins.

Can extend the battery life, which makes it well-suited for portable applications.


NEW NodeMCU V3 Lolin is a fast leading edge low cost WiFi technology Power your developement in the fastest way combinating with NodeMcu Firmware Modern high level mature LUA based technology.

NodeMcu Lolin V3 WIFI Internet development board based on ESP8266 NodeMCU Lolin V3 ESP-12E

-The ESP-12 is outdated.

-ESP-12E and ESP-12F today are the all days ESP.

Modern Internet development tools such as Node.js can take advantage the NodeMCU with the built-in API to put your idea on the fast track immediately.

It is an integrated unit with all available resources on board.

It is super simple to complement your existing Arduino projects or any development board that has I/O pins available.

Arduino-Like Hardware IO.

Code like Arduino, but interactively in Lua script.

Event-driven API for network applications, which facilitates developers writing code.

Integrates GPIO, PWM, IIC, 1-Wire and ADC all in one board.

10 GPIO, every GPIO can be PWM, I2C, 1-wire.

4M Flash Memory.

Built-in WiFi Antenna


#nodemculolin #lolin #esp12v3 #nodemcu #esp8266 #wifimodule #nodemcuv3 #nodemculolinv3


DC 5V-120V Digital Voltmeter Panel Gauge 2 Wires 0.56 inch LED Mini Voltage Meter Table Red Green Blue Display



This voltmeter is suitable for almost all electric vehicles with high precision and stability.

High precision

Reverse protection and then flameproof.


Technical Parameters:

Measuring range: red DC5-120.0V, green DC5-120.0V, blue DC5-120.0V

Power range: no additional power supply required, directly using the measured voltage as a power supply

Maximum input: DC132V.

Tolerance: ±1%

Input impedance: > 100K Europe

Operating current red <23mA, green <18mA, blue <13mA

Refresh rate: about 300mS once

Display: three 0.56 inch LED digital tube

Display color: red, green, blue

Lead length: 20cm

Dimensions: 48 x 29 x 22 mm (length X width x thickness)

Hole size: 46 x 27 mm

Net weight: 18g

Gross weight: 25g

Working temperature: -20 ° C ~ 65 ° C

Note: Input voltages above 132V may be permanently damaged!


Package Include : 1pc * Digital Voltmeter


#DC #5V #120V #Digital #Voltmeter #Panel #Gauge #2 #Wires #0.56 #inch #LED #Mini #Voltage #Meter #Table #Red #Green #Blue #Display


9V Battery Snap Holder Clip Connector Hard Shell 10CM Cable Lead  


100% Brand New and high Quality

Color:As picture

Cable Length:10cm

Package Included: 1 x 9V Battery Snap Holder Clip


#9V #Battery #Snap #Holder #Clip #Connector #Hard #Shell #10CM #Cable #Lead


Neutral acid-free rosin flux paste.

Superior fluxing ability.



Weight: 10G +- 2g


Package Includes: 1 * Soldering Flux Bar


#Acid-free #Rosin #Flux #Bar #936 #Soldering #Station #Solder #Gun #Iron #Handle #Holder #Tip #Tips Residuce Paste #Cleaner #Welding


Super fast reading speed

Long range detection



Input voltage: DC 10V-32V.

Output voltage: DC12V-35V(adjustable).

Output current: 10A (MAX).

Input current :16A (MAX) (more than 10A please strengthen heatsink).

Output power: natural cooling 100W (MAX), strengthening cooling 150W (MAX) real power.

Conversion efficiency: 94% (when Input 19V 2.5A Output 16V, Reference).

Output ripple: 2% (MAX).

Working temperature: industrial (- 40℃~+85℃) ( environmental temperature, more than 40 degrees, please reduce power to use, or - enhance cooling).

Full-Load temperature: 45℃.

No-load current: 25mA typical.

Voltage regulation: ± 0.5%.

Load regulation: ± 0.5%.

Dynamic response speed: 200uS 5%.

Short circuit protection: No (Please installs the fuse or protection circuit at input parts).

Input Reverse protection: No (please comply with a reverse protection or connect a diode at input parts.)

Dimension: 65mm x 35mm x 23.5mm.

Package Include: 1 x 150W DC-DC Boost Converter 10-32V to 12-35V Step Up Power Supply Module



DIY an adjustable on-board power supply, you just input DC 12V, then you can get output DC 12V-35V (adjustable), But the output voltage can not below the input voltage.

DIY a booster charger. Provide power for your electronic equipment.

Use Solar battery charging for electric accumulator.


#DIYMORE #150W #DC-DC #Boost #Converter #Step #Up #Charger #Power #Module



Rated Load: DC12V 0.1A

Contact Resistance: ≤ 0.03Ω

Withstand Voltage: AC250 V (50Hz) /min

Actuation Force: 1.3+-0.5N

Insulation Resistance: ≥100MΩ

Dimension: 6 x 6 x 5 mm

​Package includes: - 1 x 4-Pin Tactile Push Button Tact Switch (6x6x5mm)


#button #pushbutton #Tactile #Tactilebutton

  • Can use on both Apple and Android phone
  • Better grip when using phone
  • More fashion!


Setting 3.3V and 5.0V output (this is the power to the microcontroller, the need to upgrade the machine) Please pull out the small plate from the computer, set the jumper to take, do not charge it to avoid damage to the device.


Pin connection and description:

Connector pin assignments before you must find, especially GND must not be connected to the voltage pin, and RX and TX side do not connected to the VCC pin, the (actual measurement had some VCC pin voltage up to 14V.) Wrong shall be burnt chip adapter cable, be sure to note, do not take their own small board to do the experiment, otherwise we are not responsible for any burn. We must find a good pin definitions in the access. Connection method: Again Brush only need three lines, generally used only RX TX GND three signal lines, VCC no connection. The above is 4,5 needles friends, not to VCC and BT needle. Please use the RXD and target board TX phase, TXD and target board RX phase, GND connection GND, if not, were reversed RX and TX.


RX for TX;

TX to RX;

Ground-ground (GND to GND)


USB to serial platelet function:

1 simple serial communication.

2 or ADSL router firmware upgrade.

3 GPS serial communication.

4 hard drive firmware upgrade.

5 easy to use, RX received the MCU TX; TX RX received at the MCU connected to ground. Without the need for conversion MAX232.

6 Super Terminal in use; common serial debugging tools.

7 upgrade with a variety of satellite machine.


#PL2303HX #TTL #RS232 #PL2303 #raspberrypi #arduino #microbit



A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.Carbon film resistors are a fixed form type resistor. They are constructed out of a ceramic carrier with a thin pure carbon film around it, that functions as restive material.Resistors act to reduce current flow, and, at the same time, act to lower voltage levels within circuits. In electronic circuits, resistors are used to limit current flow, to adjust signal levels bias active elements, and terminate transmission lines among other uses.



Resistance: 1K / 2K / 2.2K / 3.3K / 4.7K / 5.1K / 6.8K / 10K / 20K / 47K / 51K / 68K / 100K / 220K / 300K / 470K / 680K / 1M Ω

Film: Carbon Film

Power rating: 0.5Watt

Package Included: 1pc * resistor



+ Nominal voltage: 3V to 6V

+ Maximum Speed: 12800 RPM

+ Torque: 5.9 g / cm

+ Motor Body Size: 25mm x 21mm x 15mm

+ Shaft Size: 9mm x 2mm diameter


Brand new and high quality.

Ideal for high frequency and low noise circuit. 

Special designed spring clip over 5000 insertion cycles.

Nickel plated, silver plated and gold plated available.

Solderless breadboard (MB-102).

Wire size: Suitabe for 20-29 AWG wires.


#MB102 #MB-102 #830 #400 #Tie #Points #Holes #Universal #Solderless #PCB #Breadboard #Mini #Test #Protoboard #DIY #Bread #Board #Bus #Test #Circuit #Board



1. A simple mechanical structure, very convenient to install.

2. By four deceleration DC motor turning flexible, good direction. The four-drive horsepower chronological. The Arduino robot 4WD smart car chassis large stability is very easy to extend.

3. Arduino robot 4WD smart car chassis Kits comes velocimetry code disc with OUR guns photoelectric quickly formed a tachometer system. Velocimetry, ranging form a closed-loop system.

4. Arduino robot 4WD smart car chassis Kits can equipped L298P four motor drive module, four tracking module, as well as the 51 seamless connection of the control unit, left red obstacle avoidance expansion hole.

5. The composition of the system is simple and nice


Package included: 1* 4WD 2 Layer Smart Car Robot Chassis Kit Base Set Arduino

#4WD #smart #car #robot #chassis #arduino




XTW6009 is a high-performance 400KHz 4A switch currency step-up (BOOST) module.

This module XL6009 is coming with the 3rd generation high-frequency switch technology as the core chip, The performance is much higher than LM2577.

Wide input voltage: 3V~32V.

Optimum operating voltage range: 5~32V.

Wide output voltage: 5V~40V.

With 4A high efficiency MOSFET switches, so the efficiency can be up to 94%, (LM2577current is 3A only).

With ultra high switch frequency 400KHz , even if small capacity filtering capacitors can achieve very good results, ripple is smaller (Compare to LM2577 frequency 50KHz).

#Arduino #XL6009 $DC-DC #Adjustable #Step-up #Voltage #Booster #Module #4A #Solar #Voltage #Board