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.
Motors of up to 3 or 4 A can be controlled with this PWM circuit. The circuit can be used with 5 to...
The current of this source is 200 mA at the most, and the output depends on the zener that may...
The integrated circuit used in this regulator is quite old. Its 1970s casing is still made of...