This circuit was found in a Motorola documentation from the 70s. The integrated circuit is from the time, an operational power amplifier according to the controlled motor.
This alarm with NO and NC sensors was found in the January 1975 Radio Electronics magazine. The...
Found in a 90s Popular Electronics, this circuit checks if a remote-control transmitter is...
This small experimental transmitter can send its signals to distances up to 100 meters. L is...