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 pulse width-tuned circuit was found in the March 1996 issue of Electronics Now magazine. The...
Using power transistors of the time, this source was published in Radio Electronics magazine in...
This circuit was found in a Hands On Electronics with the suggested application an optical link for...