FET_DIP_OSCILLATOR

Published:2009/7/1 21:10:00 Author:May | From:SeekIC

High input impedance of FET makes performance comparable to that of tube-type grid-dip oscillator. Six plug-in coils are wound on Millen 45004 1-inch 4-pin forms or equivalent. Use 150 turns No. 32 enamelfor 1.1-2.5 MHz, 77 turns No. 28 for 2.5-5 MHz, 35 turns No. 22 for 5-11 MHz, 17 turns No. 22 spaced to 1 inch for 10-25 MHz, 8.5 turns No. 22 spaced to 1 inch for 20-45 MHz and 4.5 tums No. 22 spaced to 1 inch for 40-95 MHz. Adjust R1 to set meter pointer to desired portion of scale before tuning for dip. R1 provides some control of volume when using headphones.-R.P. Turner, FET Circuits, Howard W. Sams, Indianapolis, IN, 1977, 2nd Ed., p 134-136.



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