CRYSTAL_OVEN

Published:2009/7/8 3:26:00 Author:May | From:SeekIC

All components for pioportional temperature control circuit are mounted on crystal, so total power of 2 W maximum serves for maintaining crystal temperature.Thermistor is about 1K at room emperature.Transistor types are not critical butshould have low leakage currents. Thermistor current of about 1-mA should be much more than O.1-mA base current of Q1. If Q2 is silicon, increase 150-on resistor to 680 ohms.-P. H. Mathieson, Simple Crystal Oven, Ham Radio, April1976, p 66.



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