This circuit was obtained from an 80's Electronic Engineering. The circuit detects ice formation by triggering a warning light. The operational amplifier is of the time.
This circuit was obtained in an Electronics World of 1968. The operational amplifiers ones are...
This circuit works in the opposite form to the previous one and drives a relay as a load. The...
Found in a 1970 American publication, this circuit uses transistors of the time. These transistors...