JFET_VFO

Published:2009/7/22 3:47:00 Author:Jessie | From:SeekIC

This circuit is a simple JFET-based, variable-frequency oscillator that can be used in receiver or transmitter circuits. The circuit is very stable; hence, if good-quality components and appropriate construction techniques are used, there will be very little drift in frequency. The component values listed in the table will give you a starting point to set up the oscillator to cover a desired frequency range. Inductor L1 is wound on a T50-6 toroidal core using #26 or #28 enamel-coated copper wire. The oscillator's frequency can be increased a small amount by removing a turn from the coil's winding; by the same token, the frequency can be decreased by adding a turn or two. After you have achieved the desired frequency range, cover the coil with a clear plastic coating or coil dope to keep the coil wires from moving around and causing the oscillator's frequency to shift.



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