At 19.27 2012.02.19, you wrote:
>It's any inductance in the system that isn't coupled to the output.

Thanks.


>Can you use a higher voltage transistor, and/or use a zener snubber?

I don't think the problem is there, as the oscilloscope shows that the inte=
rference
comes when the transistor switches ON and when it switches OFF, i.e. it loo=
ks it's
radiated EMI, intense because I have take a great care to make the transist=
or switch
quickly, and this works but is biting me from behind.

If I slow the turn ON and OFF, the problem almost disappears, but of course=
 I lose
energy in the snubber, which even becomes quite warm.

I am now investigating in snubbers that then put the energy back into the s=
ystem:

http://www.vanner.com/wp-content/uploads/2010/05/Passive-Soft-01.pdf

Maybe it's of interest to anyone!

Cheers,
Mario

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