[sdiy] Using Opamps as INV or NON-INV amplifiers

[Tim Daugard]

>From: Dave Kendall <davekendall at ntlworld.com>

>practical differences in use. It would seem that a single NON INV amp is
>easier to implement, and yet often the INV configuration is used, with a
>second re-inverting stage ...

Actually the inverting configuration is easier to work with. The non-inverting input is tied to a reference (and is a high impediance load, so the reference is easy to set up. The inverting input iss then used to balance the feedback and input networks. 

I use a second stage to re-invert only when necessary.

Tim Daugard
<my web-site has a bit of information on this but you will have to search for the address. A search on Yahoo for "Daugard" will get you there.