This variable frequency oscillator for radio transmission covers the range from 1.6 MHz to 20 MHz, depending only on the coil used. The circuit is very stable and can be used in amateur equipment.
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...