Hi, Edson

>     Also, I'm re-reading the PicList thread about low power step-down
> switching, but I can't make the circuits proposed to work according either
> simulated or in real-word.

    The circuit proposed by Roman Black works beutifully ! I am using a very
similar version of it both for 72 volts input and for 24v input and it is
fast and cheap. It is noisy and regulation is poor but it is a great option
for microprocessor circuits that use very little power. If you search the
archives you will find the mod's I made for making it work with up to 100
volts input.

    Does anyone knows where is Roman ? I miss his posts. Is he still
subscribed or gave up on us ?

Best regards,
Alexandre Guimaraes

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