Found in old American documentation, this circuit is intended for the control of heating elements. The SCR must have current according to the controlled load. Transistors are from the time.
This amplifier with a few watts of power was found in a Japanese technical documentation from the...
This high impedance headphone amplifier was found in American documentation from the 1990s. Any...
This small audio amplifier was found in the May 1994 issue of Electronics Now magazine. The power...