MS20. Now PSU design

[Martin Czech]

> Whilst on this topic, is anyone in favour of putting 100n caps across
> the rectifiers to reduce reverse recovery spikes? It does work, but is
> it worth it? 

Seems to be. E.g. the elektor  MC Preamp used such caps in the psu.


> put smaller caps in parallel with big smoothers as it can create a
> parallel LCR with the smoother's inductance. Not sure about this one
> either.

As far as the R component is large enough, this LRC should be damped.
Some ceramic and other caps show very bad resonator behaviour on their
own.  We had trouble with this at some of our Audio-DAC. So, a lot of
different manufacturers caps where measured, and the results where very
different also. 


Good idea to measure this again, if I have the time...

m.c.