OP Amp weird output

Question

Can anyone explain why the output is so distorted and weird?

Circuit

Waveform

How is the op amp powered? – Leon Heller Oct 29 '16 at 16:21 — Leon Heller, Oct 29 '16 at 16:21
What were you expecting the output to look like? – The Photon Oct 29 '16 at 16:23 — The Photon, Oct 29 '16 at 16:23

score 3 · Answer 1 · answered Oct 29 '16 at 16:24

You have the op-amp connected a comparator, with the (+)input as the feedback node. In other words, you are using positive feedback.

If you want a linear amplifier, then you must use the (-)input as the feedback node. Swap the (+) and (-)inputs in your circuit.

score 1 · Answer 2 · answered Oct 29 '16 at 16:26

1

It's pretty much what I'd expect to see for an opamp configured as a comparator with a small amount of positive feedback.

If you we're trying to create a high gain linear amplifier swap the input pins to get negative feedback and a gain of about twenty.

answered Oct 29 '16 at 16:26

Andy aka

2 Answers2