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 circuit indicates the logic level of a TTL output. The resistors can be 1k and the...
This circuit was found in an old documentation and can be implemented with BC549 transistors. The...
This circuit was found in a 1964 Electronic Design to indicate when a headlight or flashlight bulb is...