20_500_kHz_CRYSTAL

Published:2009/7/2 9:15:00 Author:May | From:SeekIC

Series-mode oscillator requires no tuned circuit, gives choice of sine or square output, and has good frequency and mode stability. Works nicely with troublesome FT241 crystals. If any crystal fails to start reliably, increase R1 to 270 ohms and R2 to 3.3K. For squire-wave operation, C1 is 1-μF nonelectrolytic. Omit C1 for sine-wave operation; harmonic output is then quite low, whh second harmonic typically -30 dB. Output is about 1.5-VRMS sine wave or 4-V square wave.-R. Harrison, Survey of Crystal Oscillators, Ham Radio, March 1976, p 10-22.



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