1. Steps of wire break alarm circuit.
2. Steps of wireless AC line detector circuit.
3. Steps of light on timer circuit.
Product list:
Product list:
LED https://www.utsource.net/category/led-lighting-1.html
BC547 https://www.utsource.net/sch/BC547
BC548 https://www.utsource.net/sch/BC548
Capacitor https://www.utsource.net/category/passive-components/capacitors-1.html
Buzzer https://www.utsource.net/itm/p/8027239.html
Resistor https://www.utsource.net/category/passive-components/resistors-1.html
More details, pls check the video on Youtube: