This circuit is from an Electronics World of 1968. The transistors are of the time and the power is supplied with a voltage of 40 V. The circuit is high fidelity.
This circuit is from a Radio Electronics from August 1992. The transistor used allows the control of...
This circuit can be used with 3 receivers and is intended for low frequencies (medium wave range). We...
This useful benchtop power supply uses a single LM350 integrated circuit as a regulator. The...