> Hi all,
>
> I have a circuit mounted on a fan, doing about 3000 rpm. This circuit h=
as
> to be powered with 5v, 30 mA. I can't use brushes because they slow dow=
n the
> fan too much.
> I tried to make an "open transformer": an open coil (not rotating) with=
 a
> smaller coil with iron core inside it (not touching the other coil, and
> rotating).
> Both coils have ~30 windings.
> Using 50 Hz 5v 500 mA at the primary side,=C2=A0only 300 mV shows up at=
 th
> secondary side with short-circuit current of 1 mA.
> Should I use a higher frequency, or just make the coils larger with mor=
e
> windings?
> (or is this never gonna work and you have a better idea?)
>
> Thanks in advance,
> Koen van Leeuwen

Do a Google search for Propeller Clock. These are PIC projects and some o=
f them do exactly
what you are attempting.

Regards,
Stephen D. Barnes

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