Electronics > Projects, Designs, and Technical Stuff

Bizzare op amp buffer behavior - too much gain

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StillTrying:

--- Quote from: ChristofferB on January 23, 2019, 11:47:39 pm ---I'll order some pin-compatible rail-to-rail op amps.
--- End quote ---

You need only single supply op amps, because your input and output is well less than the 24V.
I nearly always start with a CA3140.  :)

ChristofferB:
Roger, makes sense, i'll look into it. Thanks!

Zero999:
The LM358 will probably do but is a buffer needed? The impedance of the AD8226 reference is 100k with a bias current of 7μA and your potentiometer has a maximum impedance of 10k.

ChristofferB:
The data sheet is very adamant about buffering.  I just tried to belt-and-braces it.  I think I have some 358s somewhere.. right now my taped-on AA battery works a treat as reference!

SiliconWizard:
Do you really need to be able to trim the reference? If not, a fixed reference could be just made out of a small LDO instead.

Note that you could still trim it using an adjustable LDO. It's another way of doing it.

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