D_C_PREAMP_FOR_VTVM

Published:2009/7/24 1:55:00 Author:Jessie | From:SeekIC

Prevents damage to transistors when making measurements with 1.5-v or 3-v range in semiconductor circuits. Feedback from Q3 to Q2 gives stability and linearity. Circuit can extend range of 1.5-v vtvm down to 500 or 150 mv full scale, but is sensitive to supply voltage variations and has open-circuit gain of only about 50.-A. K. Scidmore, Low-Cost Emitter-Follower Extends Voltmeter's Range, Electronics, 39:3, p 87.



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