Dwayne Reid wrote: > At 11:19 AM 5/10/2010, Olin Lathrop wrote: > >> Also just removing R9 won't make a unit gain stage, but a >> oscillator. TL072 are not unity gain stable, despite what some >> sources claim. > > Hmm - this looks wrong. I've been using TL07x as unity gain buffers > for decades now. > > Just looking now: TI's data sheet > says that the chips > are unity-gain stable. See page 9 of the PDF file I referenced above. Yes, that's why I say "despite what some sources claim". I have seen these things oscillate in some cases. Maybe those weren't genuine TI parts. If you specify genuine TI parts then you should be able to use them as unity gain buffers. However, there are various second sources out there. If you allow your purchasing people to pick where they get these amps from and who makes them, you'd be better off not relying on unity gain stability. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist