This circuit was found in the July 1990 Radio Electronics magazine. It is based on the 3-digit indicator ICs CA3161 and CA3162.
Suggested by Raytheon in 1967 documentation this circuit uses a lightbulb and LDR optical coupler of the...
Found in American documentation from the 90's, this circuit consists of a solid state relay with...
Indicated to be used at the sensor input of a PC, this circuit was found in an English...