Found in July 1975, Radio Electronics magazine this circuit can use any operating circuit, including the 741. The circuit must use a symmetrical power source.
The circuit is from 1968, but we can use a modern one like the 741. The symmetrical power supply...
This circuit was found in a 90s Hands On Electronics. It monitors the presence of voltage in a...
This circuit with a few watts of power was found in the April 1995 issue of Electronics Now...