This 4-channel mixer amplifier was found in an American publication from 1947. The circuit uses counterphase output tubes and a transformer power source.
This 8-channel converter was found in a 1970s American documentation. The integrated circuits used are...
This circuit is from a 1995 documentation. Several CMOS integrated circuits are used to produce...
Found in Radio Electronics, this circuit is intended to activate the lighting system of garages...