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Fet voltmeter

2017-08-19 20:31  
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This FETVM replaces the function of the VTVM while at the same time ridding the instrument of the usual line cord. In addition, drift rates are far superior to vacuum tube circuits allowing a 0 volt full scale range which is impractical with most vacuum tubes.
Fet voltmeter

The low-leakage, low-noise 2N4340 is an ideal device for this application.

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