I'm trying to get all the kinks out of a small 250 mA 5V switch-mode supply that uses an LNK306.
It functions, but its hideously noisy. I've got 0.3 V peak-to-peak of triangular-looking garbage
maybe about 2.5 kHz on the output at load.
All the design guides for supplies make a big deal of PCB layout considerations, so I'm wondering
if its even possible to breadboard designs of this sort, and whether breadboard effects could be
responsible for what I'm seeing.
I'm following this design guide:
with occasional reference to this design for further improvements (in particular a faster diode on the input rectifier):