FET VOLTMETER


Posted on Feb 4, 2014

With FET in one leg of Wheatstone bridge, meter has input impedance of over 1 megohm. With no input voltage, adjust R4 so meter reads zero. With 9-V battery, RI can be adjusted for full-scale meter reading of 8 V. With 12-V battery, meter range is 0-10 V. -F. M. Mims, `Transistor Projects, Vol. 2, ` Radio Shack, Fort Worth, TX, 1974, p 59-66.


FET VOLTMETER
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