| Electronics > Beginners |
| Understanding op amp circuit |
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| d4n13l:
Hi, I'm starting with op amps, from the schematic, I get 0-1V from voltage divider, and I would expect to see the same voltage in the output of the op amp due to the negative feedback but it stays frozen at 1.9V no matter the +IN voltage. Could someone help me figure out why isn't it working? |
| rstofer:
Check the data sheet. The op amp probably can’t work within a couple of volts of the rails. |
| Ultron81:
Yeah, what he rstofer said. If you want the input to drop to 0, you either need to supply a negative supply voltage to the op amp, or use a single-supply op amp that can go to 0V like a LM358. |
| d4n13l:
It worked with the LM358, I didn't know that not all op-amps can be used like that. Thanks :) |
| nigelwright7557:
--- Quote from: rstofer on July 24, 2019, 12:19:26 am ---Check the data sheet. The op amp probably can’t work within a couple of volts of the rails. --- End quote --- Try a rail to rail op amp. Not all op amps work close to the rails. In fact some invert the output if close to the rails. |
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