This high-power amplifier with only 4 integrated circuits was found in the 1990 special issue of Radio Electronics Experimenter magazine. The circuit reaches 100 W per channel.
Quadrature Generator for Transistor and SCR Testing This circuit was found in US 1980s...
This circuit, with output currents up to 500 mA, can stabilize or regulate the output voltage of a...
This circuit that uses only transistors that are still common was found in a 1995 documentation. The TIP41...