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 circuit was found in a National Semiconductor manual that is now a Texas group company. The...
We found this 5-digit circuit in a 1990 publication. The displays are of a common cathode and the...
This experimental radio was obtained in an old Argentine publication. Germanium transistors are...