This nonlinear gain circuit was found in a 1965 Electronic Design. The configuration can be used as a basis for modern designs with equivalent transistors.
This sonic relay circuit is driven by a high-pitched sound picked up by a microphone that can be a...
Found in a 1966 General Electric manual, this circuit provides a delay in starting. The motor is...
This amplifier uses an operational amplifier from the time. It was found in the February 1970...