This circuit is tuned to reject stations of different wave bands that may be interfering with the reception of short waves.
This circuit can use the LM148 and its more modern equivalents, generating a sinusoidal signal whose...
This circuit was obtained in a 1980s publication, but it can be easily assembled today, as all...
This amplifier circuit was found in a Radio Electronics from April 1959. The circuit needs only 20 mV...