This circuit is from Motorola's Linear Databook from 1990. The integrated circuit and transistors are uncommon, but the circuit can be assembled with equivalents.
This light-controlled circuit uses a 6 V or 12 V relay depending on the supply. The transistor can be the...
This circuit was found in an American publication from 1965. The circuit uses components from that...
This powerful inverter provides a high-quality sine wave signal. I found it in a Radio Electronics issue...