Suggested by Fairchild in a 1980s publication, this multiplier uses operational amplifiers from that time. The power supply must be symmetrical.
This circuit, from an 80's publication, detects the SCA (Announcer Eliminator) signal from FM...
Found in a 1963 documentation, this circuit employs germanium transistors of the time. Transformer and...
This circuit, which has a strong didactic appeal, simulates logical functions, and can be used in...