On Mon, 26 Mar 2001, David VanHorn wrote:
> >http://www.bobblick.com/bob/projects/yamm/
>
>
> Nice design! :)

Thanks.

> Did you try multifilar winding to reduce the energy that ends up in the
> snubber?

Yes, the input and +5 out are wound together. There's not much energy
wasted in the snubber, if I had to guess it'd be under 1/4 watt judging by
the resistor not showing any heat. It'll run without the snubber, but a
little bit of zenering happens on the mosfet.

The only drawback is that I used the LM3524 instead of something like the
UC3843 that is meant to drive a mosfet, so there's a little extra waste
with the pinch-off resistors. Of course the UC3843 has drawbacks too.

BTW this mp3 player has been running more than 2 years under the seat of
my car, from winter in eastern Oregon to summer in Phoenix. It powers the
computer down to 8 volts input, so you can start the car while it's
running.

Cheers,

Bob

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