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dirty smps

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Simon:
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

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

Simon:
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

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

Simon:
yes drawing error, will correct

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