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 MW radio was found in a 1975 publication, but it can be mounted with BC548...
This control for bass, midrange, and treble was found in the March 1995 issue of Electronics Now...
This circuit from a 1967 documentation generates 2.5 Hz signals depending on the capacitors used,...