This PA or Public Address amplifier with a few watts of power was found in the March 1986 Radio Electronics magazine. It uses two LM380 ICs in bridge mode for higher power.
This simple 10-position roulette circuit with the 4017 found a 1987 documentation. The circuit can...
This small auxiliary amplifier was found in a Radio Electronics from May 1958. Power is supplied with...
According to the article in Radio Electronics from April 1986, it would be possible to detect...