On Fri, 23 Feb 2018 18:48:24 -0000 "David C. Partridge" <david.partri...@perdrix.co.uk> wrote:
> Looking your schematic, I see that you are using LT1225 for both U2 (U111) > and U3 (U112) > > Why did you use those rather than LM6361 and AD848? Was it just because > LTSpice didn't have models for them? It can make a difference ... Yes. LTSpice doesn't have an LM6361 or AD848. Linear lists the LT1225 as replacement for LM6361, so I thought this was safe. I deemed the AD848 to be close enough. But as Bruce mentioned, the LT1225 is not unity gain stable, while the LM6361 is. That might explain the oscillations. > BTW LM6361 is 550V/mv not .55V (I assume that was a mistake in your post) ... > Slew rates seem a bit different at +/- 15V supply as well. The datasheet I have found (Natsemi Sept 1995) lists 550 V/V = 0.55 V/mV. Which I think is a bit low, but then, the opamp is old. Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson _______________________________________________ volt-nuts mailing list -- firstname.lastname@example.org To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.