Found in a 90s Radio Electrconics, this circuit is an operational one with a power stage using two transistors. The output current can reach several amps.
This circuit is from a Popular Electronics from the 90s. The circuit has a tone frequency...
This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose...
This circuit is based on a common cathode 7-segment display. The circuit is based on CMOS...