This circuit has tone control, and its power depends on the supply voltage. The circuit is from the Philips integrated circuits manual from 1990.
In the figure we have an improved method of varying the voltage of a 7812 regulator. The circuit is...
This amplifier operates with a current amplifier for audio distribution lines. The power MOSFET can...
This circuit was found in Popular Electronics from 1992. The circuit has steps determined by...