150_500_kHz_CRYSTAL

Published:2009/7/6 0:35:00 Author:May | From:SeekIC

Circuit is series-mode if C1 is 0.01 μF. Parallel-mode crystals can be used if C1 is equal to specified load capacitance (30, 50, or 100 pF) for crystal. Harmonic output is usually better than -30 dB. Circuit is particularly good for crystals prone to oscillate undesirably at twice fundamental frequency. L1 is 800-2000 μH for 150-300 kHz, and 360-1000 μH for 300-500 kHz. Adjusting slug in L1 pulls crystal frequency. Q1 is 2N3563, 2N3564, 2N3693, BC107, BC547, or SE1010.-R. Harrison, Survey of Crystal Oscillators, Ham Radio, March 1976, p 10-22.



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