Tuesday, December 01, 2009

Adjustable-Gain Difference Amplifier Circuit Measures Hundreds of Volts, Rejects Large Common-Mode Signals

A diff-amp in a feedback loop with an inverting op amp is useful for measuring differential signals up to 500 V. This circuit also rejects large common-mode voltages, and allows the differential gain to be set by a ratio of resistors, enabling the user to select the level of attenuation.


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