Op-Amp Help

Thread Starter

dasloth12

Joined May 26, 2008
2
Hi All,
i need some help with building an op-amp circuit to take a 0V-5V signal from a DAC and swing from -10V to +10V. Do i use a non-inverting amp config and tie the inverting input to -10V instead of ground? any help would be appreciated.

thanks
 

SgtWookie

Joined Jul 17, 2007
22,230
Have a look at the attached for a couple of different approaches.

The 2nd one looks easier, but the input offset voltage of the opamp will get amplified by the output more, introducing more error.
 

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AdrianN

Joined Apr 27, 2009
97
Or, if you want to use a non-inverting amplifier as you suggest, you need to have a 3.3V in the inverting input, as in the attached schematic. There will be a small error because, when the DAC is at 0V, the output will be 3.3V times the gain of -3 which is -9.9V not -10V. However, you can adjust the 3.3V level to give you an output of -10V.
 

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