With this circuit, signals in the range of 10 kHz to 150 kHz can be received at close to 4 MHz from a shortwave receiver. The circuit is from a 303 Circuits from the 90s.
This simple receiver of two transistors for the 80-meter range was found in an American...
This power stage with transistors is stabilized by two lamps. The circuit was published in Radio...
This circuit was found in a 90s Popular Electronics. The circuit uses several relays in order to...