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

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):

^{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.