Based on the CA3161 and CA3162, this circuit was found in the July 1990 Radio Electronics magazine. The circuit is two digits only.
It is an electronic capacitor where the capacitance "seen" by an external circuit connected to...
We found this circuit in an American documentation from the 90s. Through an LED it indicates the...
This circuit trips, changing state, when the input voltage exceeds a value determined by R1 and...