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Subject: Re: op amp scaling circuits design

Date: 05/14/03 at 4:42 PM
Posted by: Russ Kincaid
E-mail: russlk@netzero.com
Message Posted:

In Reply to: op amp scaling circuits design posted by Bea on 05/14/03 at 11:29 AM:

1. The ratio of Deg F to Deg C is 9/5, so the feedback resistor is 9K and the input resistor is 5K. There needs to be offset at the + input of the op amp to set the output to a particular voltage,for example: 2.12 volts at 100 deg C.

2. The ratio of Kelvin degrees to Centigrade is 1/1 but there is a difference of 273 degrees. To get 10 mV from 1 uA, the resistance is: R=E/I = 1K.


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