HARTLEY_JFET_OSCILLATOR

Published:2009/7/21 2:19:00 Author:Jessie | From:SeekIC

This simple Hartley JFET oscillator has a built-in zener-diode regulator to condition the power-supply voltage down to 9.1 V. L1 depends on the desired frequency. Typical values are C1=5 to 50pF variable, C2=100 pF plus a 3-to 30-pF trimmer, and L1=14μH (for 3.5 MHz). L1 should be mechanically rigid, should have an air core (do not use ferrite cores because of drift effects), and should have Q ≥ 200 for best stability. The tap will be typically 10 to 25 percent of the total turns.



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