Tuesday, 29 April 2014

operational amplifier - How to offset an input voltage of 0V ~ 10V to -400mv ~ +400mv?



enter image description here


I have a circuit input which provides a voltage range of 0v to +10v DC. How do I change this output to -400mv ~ +400mv DC ?



Answer



You could use this circuit (differential amplifier):


schematic


simulate this circuit – Schematic created using CircuitLab


The output voltage is: Vout = R2 / R1 * (V2 - V1)


If you use:



  • V2 = your input voltage (0V to +10V)


  • V1 = 5V (reference)

  • R2/R1 = 8/100


You will obtain +400mV output when Vin is 10V and -400mV when Vin is 0V. I leave to you the consideration about choosing the exact resistance values, the appropriate Op Amp and its power supply.


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