| 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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