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dirty smps

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So attached is the diagram and scope view of the circuit. I can't work out why I'm getting all the "ringing". perhaps because it's on a breadboard ?

I actually got a very good output when I coupled the mosfet straight to the comparator output. I'm using a load of 120 ohms. I'm not after a perfect output just a rough stepdown

Quite likely - it's hard to breadboard SMPS and not have issues like this.

yes that is what I thought, there are wires all over the place, I was going to try vero boarding it to see if it improves

Hello, perhaps only an error in the drawing, but  shouldn't D1 and C? be connected to GND?

yes drawing error, will correct


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