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 the July 1992 issue of Radio Electronics magazine. The circuit is based...
The circuit illustrated in Figure allows external loads (8) to be driven from parallel port...
The sensor of this circuit is a thermistor of the same value as the adjustment circuit formed by...