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.
We found this circuit in a Radio Electronics from the 90s. Transistors admit current equivalents,...
Found in an EEE from 1970, this circuit supplies a voltage of 12 V DC x 10 mA current from the...
This circuit, found in a publication of the year 1968, uses a transformer to drive two power...