This good power amplifier, a few tens of watts, is part of an article in the December 1972 Radio Electronics magazine. The power supply must be symmetrical with at least 3 A.
This circuit produces a sound effect that can range from the sound of a bird to a siren. The...
This circuit is from a 1968 Motorola power circuit manual. The circuit uses transistors of the...
Found in an American 1980s documentation, this circuit generates frequencies in the range...