What makes it rather special is that it relies on only one type of device, every one of its transistors is a BC547. In design terms, it follows the lead set by other simple amateur transmitters ...

The circuit is a simple one, and a classic. The spring from a ballpoint pen is soldered to the base of a BC547 transistor, and when held close enough to a conductor carrying AC power, a current is ...

This project demonstrates an automatic street light system using basic electronic components, including an LDR (Light Dependent Resistor), LED, BC547 transistors, and a 9V battery. The circuit ...

2 shows the circuit diagram of the sound alternator, which is built using the ESP32 board, BC547 transistor, two red LEDs ... The capacitor’s negative terminal is connected to the base of the ...