Fig. 2 shows the circuit diagram of the sound alternator, which is built using the ESP32 board, BC547 transistor, two red LEDs, a speaker, and other components. Fig. 2: Sound Alternator with ESP32 ...

This project demonstrates the construction of a 4-bit adder using BC547 transistors, resistors, LEDs, and other components on breadboards. The adder takes two 4-bit binary numbers as input and ...

When working around mains voltages ... 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 ...