This circuit shows how to make an adaptation on an AM receiver to receive CW and SSB signals. The circuit is from an 80's documentation. The diode is commonly used.
Audio signals can be produced by this circuit. Frequency range is determined by C1 and adjusted by...
This Colpitts crystal oscillator was found in an American publication for amateurs in the 1980s....
This configuration presents a negative resistance caracteristic such as the one found in...