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 circuit appeared in the July 1969 issue of Radio Electronics magazine. The sensor is an LDR....
This circuit was found in an American medical documentation from 1970. The circuit rejects the 60 Hz...
This is a basic flip flop circuit with neon lights. We found it in a Radio Electronics magazine from...