This small 1 W amplifier uses a Motorola integrated circuit from the 1970s. The integrated circuit used is uncommon today and the power supply does not have to be symmetrical.
This circuit was suggested by Motorola in a 1969 publication. It makes use of components of the...
Using germanium transistors, this amplifier provides a 540mW output power when powered by 9V. We...
This circuit was found in a 90s Popular Electronics. It prevents the power from being switched...