This circuit was obtained from the 1995 Encyclopedia of Electronic Circuits Volume 5. The circuit uses a CMOS 4001 and has a transistor power stage.
This automatic control for recording signal level was found in a Radio Electronics from September...
This switched-mode circuit was found in the April 1976 issue of Radio Electronics magazine. The...
This circuit, from a 303 Circuits from the 90s, uses a telephone pickup coil as a sensor to...