2_20_MHz_VXO

Published:2009/7/6 0:40:00 Author:May | From:SeekIC

Variable-frequency crystal oscillator plus buffer, using Signetics N7404A hex inverter or equivalent, covers 2-20 MHz. Only three inverters are used, two forming oscillator and one as output buffer. VCC is +5 V. Crystals can operate at fundamental, third, or fifth over-tone. Frequency-limiting capacitor Cp can be 15 pF. Only higher-frequency crystals can be moved useful amounts without creating instability problems. Article gives design equations and tables showing frequencies obtained with various crystals for various values of frequency controls CV (0-100 pF) and LV (0-17 μH).-B. King, Hex Inverter VXO Circuit, Ham Radio, April 1975, p 50-55.



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