TUNING_NULL_INDICATOR

Published:2009/7/2 23:18:00 Author:May | From:SeekIC

Uses standard left-zero meter as tuning indicator connected in basic opamp AC voltmeter configuration using IC1, with reference buffered by opamp IC2. DC output voltage of tuner is compared with nonzero reference voltage; as these voltages approach each other during tuning, meter pointer moves toward zero, and abruptly reverses direction as tuning null point is passed. Diode D1, protects meter from overload. Use any lowleakage diodes for bridge.-A. S. Holden, Sensitive Null Indicator, Wireless World, Oct. 1974, p 381.



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