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Subject: Re: Zero Shift of Analog Voltage

Date: 07/17/02 at 6:04 AM
Posted by: David Ashby
E-mail: dashby@quin.co.uk
Message Posted:

In Reply to: Zero Shift of Analog Voltage posted by Bill on 07/16/02 at 2:49 PM:

Hi Bill,

Here's a link to a page showing the op-amp circuit Russ mentioned:

http://ourworld.compuserve.com/homepages/Bill_Bowden/opamp.htm#opamp.gif

Scroll down the first page a bit, and you'll see a diagram for an 'Inverting Amplifier'. To get a gain of 1, make both resistors the same value, e.g. 10K. In the diagram, the '+' input is tied to 0V (shown by the earth symbol) - you need to tie this to +0.25V rather than 0V. One way to get 0.25V is to derive it from the positive supply rail using two resistors as a potential divider.

David Ashby


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