Basic_meter_amplifier

Published:2009/7/24 3:30:00 Author:Jessie | From:SeekIC

This circuit operates from two D cells, and provides a current range as low as 100 nA full-scale. With RS set at 10 MΩ, the total current drain is 0.6 μA for a total power-supply drain of 1.8 μW. Input bias current is about 600 pA. When operated with two No. 950 D cells (Eveready), quiescent power drain is so low that no on/off switch is needed (typically, batteries last for a minimum of one year).Meter deflection is set by the value of Rf, where output voltage VO, equals If/Rf. A practical value for full-scale meter deflection is 300 mV.



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