Found in an Electronic Design from the 90's, this circuit simulates a 100 W resistor. The power transistor must match the desired current in the load under test.
This circuit with bass and treble control and 10 W of power per channel is from the SGS manual of...
This circuit can be used to produce the sound of bongo drums. Damping is adjusted by P1. The...
The circuit shown timing the drive of a motor using an optical coupler. The diode bridge can be...