We found this circuit in the Radio Electronics Handbook magazine special edition of 1992. The circuit uses an optocoupler as an electronic potentiometer.
Found in General Electric documentation from the 1980s, this high speed perforated tape reader...
This circuit indicates when the voltage of a 12 V battery is low. With changes, for example, the...
We found this signal generator circuit in the November 1978 issue of Radio Electronics magazine. The...