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Date: 10/29/03 at 10:22 AM
Posted by: John Dunn
E-mail: ambertec[AT55]ieee.org (replace [AT55] with @ to reply)

In Reply to: Need help in designing an opamp circuit posted by Peter Ng on 10/29/03 at 7:41 AM:

Hello, Peter.

For changes of 100 mV of output for each 45.9 mV of input change, consider a non-inverting stage with a feedback resistor of 16.5K and a resistor of 14K from the inverting input to a variable, low impedance bias source.

The 16.5K and 14K are standard 1% RETMA values, so you should be able to purchase them easily.

Then you will have for each 45.9 mV of input change, an output change of 45.9*(16.5+14)/14 = 99.996 mV --> 100 mV.

Good luck.

John D.

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