Posted on Sep 22, 2012

A Hartley oscillator is shown at the right. It uses most of the same components as the Clapp oscillator. A capacitor is necessary to block the gate bias voltage from the tuned circuit. The tuning capacitor is a 100 pF poly capacitor. L1 is a coil wound with #30 wire on a 1/2` form--I used a lucite tube. It has 210 turns, tapped at the 45th turn, and is about 3` long. The tube makes a nice handle while winding the coil, and is cut off when the winding is finished.

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