How does this oscillator work?

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DFR123

Joined Aug 22, 2011
4
Hi I would like to know how the circuit in the attached picture works.

I don't get it.

Thank you very much
 

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SgtWookie

Joined Jul 17, 2007
22,201
That circuit is a poor design, as there is too much hysteresis feedback.

I've re-drawn the schematic so that it is easier to understand, corrected the hysteresis, and added plots of the +, -, and output so that you can see how it works.

[eta]
The circuit that Bertus linked to uses a dual supply for the opamp, so the resistor divider like I used (R2, R4) can be simplified by removing R2.
 

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