tl072

[newperson]

Hi,
What is the smallest circuit that could be build to use as a test circuit for a TL072 IC?

[gregwbush]

The simplest circuit i have built with a tl072 (dual op amp) uses just one of the op amps and is the AMZ op amp buffer

http://www.muzique.com/news/opamp-buffer-layout/

That'll tell you if it works... (assuming that's what you mean by test circuit... if not, please elaborate!)

[newperson]

Thanks for the reply.  I think I would need something using both sides of the amp to make sure the ICs fully work.  And yes this is what I am looking for in a 'test circuit.'

[LucifersTrip]

can't you just hook up the same circuit separately for both sides of the opamp?

[gregwbush]

It would be very unlikely that if the chip works, one half of it doesn't, but i understand you want peace of mind 

You could do as LucifersTrip suggests and build a dual buffer

As it happens, i did a vero (strip-board) layout some time ago for one... I'm just labeling components better for you now, and i'll post it....

Ok here it is

[jk-fm]

Triangle oscillator! 3 resistors, 1 cap, + 2 resistors for vref

[gregwbush]

you can plug a guitar into mine