100_K_MEGOHM_DC_PROBE

Published:2009/6/25 4:10:00 Author:Jessie | From:SeekIC

A 741 op amp is used with t00% ac and dc feedback to provide a typical input impedance of 1011 ohm and unity gain. To avoid hum and rf pickup the input leads should be kept as short as possible and the circuit should be mounted in a small grounded case. Output leads may belong since the output impedance of the circuit is a fraction of an ohm. With no input the output level is indeterminate. Including RI in the cir-cuit through lowers the input impedance to 22 M.



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