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Simple Differential input adapter Using CA3140

2015-01-08 09:36  
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In some cases, we often encountered a differential input voltage required for measurement. Using only one operational amplifier, you can build an adapter to give your input for floating-ground reference voltage. In the circuit diagram is one example and you should try. Circuit diagram is very simple in using IC-OP Amp CA3140.  Here is a schematic picture:


Differential input adapter Simple Differential input adapter Using CA3140

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

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