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.
With this circuit found in an American documentation from 1969 it is possible to vary the...
The reference voltage for this circuit can be selected digitally. The circuit is from Radio...
This circuit was found in an old factory documentation. The circuit uses single-junction...