Koa Choi

Get Pyroelectric Infrared Sensor Anti-theft Circuit DIY Kit Soldering Practice Board Circuit composition and function: The circuit consists of pyroelectric infrared sensor PIR to detect infrared, triodes VT1 and IC2A to amplify signals, IC2B and IC3 as comparators, triodes VT2 and buzzer HA to form an alarm circuit, VT3 and peripheral components to form a startup delay circuit. The circuit is equipped with rectification filter and battery E, in order to continue to supply power preventing of power failure. This circuit can be used as home anti-theft. When family leaves the room, switch S2 is closed and the circuit works. As soon as someone enters the room for a while, they will sound an alarm. The monitoring range is 7m and 86 °. Note: did not have assemble manual. Package included: 1 x Pyroelectric Infrared Sensor Anti-theft Circuit DIY Kit Pyroelectric Infrared Sensor Anti-theft Circuit DIY Kit Soldering Practice Board See detail

Get Super Capacitor Group 16V66F Automotive Electronic Rectifier Battery Protection Rectifier Description: Capacity: 66F Voltage: 0-16V Volume: 275x75x48mm Weight: 1000g Extend battery life: After the car rectifier effectively stabilizes the current flowing into and out of the battery, the battery's life is naturally longer, otherwise the high and low currents before the installation will damage the battery. (Usually can extend 1-3 years) module life 5-10 years),      1. Increase engine power, make the throttle response more brisk and sensitive 2. Improves the phenomenon of picking up cars at low gears, making shifting smoother 3. Improve ignition efficiency and make fuel burn more fully 4. Spark plugs that evenly supply power to each cylinder make the engine work more smoothly 5. Reduce the phenomenon of idling jitter to make it more stable 6. Reduce clutter interference and improve sound quality of car audio system 7. Protect the battery and the original car electrical circuit sy

Get 88*110*38mm/88*70*38mm Aluminum Alloy Box Aluminum Profile Shell Electronic Project Case PCB Shell Description: Size: 88*70*38mm (Type 1) Size: 88*110*38mm (Type 2) Color: Black Package included: 1 x Aluminum Alloy Box 88*110*38mm/88*70*38mm Aluminum Alloy Box Aluminum Profile Shell Electronic Project Case PCB Shell See detail

Get TK627 2.4G Wireless Laser Pointer Presenter Airmouse Air Mouse for PPT TV Box Smart TV Speech Meeting Presentation Features: 2.4G Wireless connection up to 10 meters Can be used as a normal airmouse for TV box, PC and laptop Can be used as a laser pointer for PPT presentation Campatible with Windows, for Mac OS, Linux, Android Package Included: 1 x TK627 Airmouse 1 x USB Dongle TK627 2.4G Wireless Laser Pointer Presenter Airmouse Air Mouse for PPT TV Box Smart TV Speech Meeting Presentation See detail

Get 5V 9V 12V 24V 1 Way Relay DIY Kit Control Board Expansion Board Kit Features: (1) Board size: 51MM * 23MM (2) Supply voltage: 5V, 9V, 12V, 24V(depending on the relay voltage) Interface definition: VCC: positive power of relay module GND: negative power of relay module Signal: Control signal. When the input is high, the relay will be closed and the indicator light will be on. Supports 3.3V single chip or 5V single chip. Use reminder: VCC and GND input the same voltage as the relay. When the signal terminal input is greater than or equal to 3.3V (high level), the relay is pulled in. When 0V is input, the relay is reset. During the test, VCC and the signal terminal can be short-circuited, the relay is closed, and the indicator light is on, indicating that there is no problem. Package included: 1 x 1 Way Relay DIY Kit 5V 9V 12V 24V 1 Way Relay DIY Kit Control Board Expansion Board See detail