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 egg timer has been found in an English magazine that no longer exists in 1982. The...
This circuit was published in an 80's American documentation, but it is still current. The power...
Suggested by an American publication of 1964 this circuit is intended for the capture of signals...