Found in American documentation from the 90s, this circuit can be used as a shield with the replacement of the output optical coupler. The operational also admits equivalent.
This sensitive 5-band circuit was found in a September 1995 issue of Electronics Now magazine. The...
This circuit with the ICL8068 was taken from an article in the February 1981 Radio Electronics magazine....
Capacitor C and resistor R in this circuit determine the time the output remains at the high level...