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 telegraphy circuit generates an audio tone from a pure RF carrier. We found it in a...
Found in Popular Electronics from the 90's, this circuit uses 555 integrated and common...
This circuit was obtained in a 1982 English magazine. It is a regulator for outputs between 1 and...