This circuit is from National Semiconductor using an LM11, which is uncommon nowadays. The circuit can be implemented with other operational ones.
One touch on S1 and the circuit turns on. With a tap on S2 it turns off. This is the purpose of...
This circuit was found in an English technical documentation from 1976. The supply can be done...
This water level control circuit was found in a 1980s documentation. The circuit uses a capacity...