- Joined Oct 15, 2009
I'm attempting to build a voltmeter of sorts and want to be able to measure from -75VDC to 75VDC and need to scale that to a 0-5V signal into a single ADC channel on a micro.. I guess the typical way to do that is to set 2.5V as 0 volts and then -75V would be 0V and 75V would be 5volts.. Is that correct? and how would I accomplish that. or is there better ways to accomplish the task. I've done very..very little work with op amps and just don't know where to start with this because of the negative voltages too. Thanks in advance for any help you guys provide..