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Single Input to Differential Input Adapter for Digital Voltm

2015-01-11 06:56  
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I some cases, a differential input is needed for voltage measurement. Using the only one operational amplifier, you can build an adapter to provide a floating input for your ground-referenced? voltmeter.

differential input adapter circuit schematic

Use 1% tolerance metal film resistor for R1 and R2.? Adjust VR1 to give zero voltage output when the input probe is shorted.? You can use voltage supply Ub and -Ub between 3 to 20V, as long as it is a symmetric supply.

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