On Wed, 30 Jul 2003 13:19:08 +0000 (UTC), "Dave D"
wrote:

No need for that. The cap is in _series_ with the motor, and in _parallel_
with the resistor or diodes or LM317. On startup, the cap acts as a very low
resistance shunting the resistor to apply full voltage to the fan. When it
charges up its resistance goes high and it is effectively no longer there,
so the resistor does its job. When the fan is powered off, the resistor
discharges the cap so it's ready to go again. Great idea, so simple like the
best of them!

It's the best annd it works perfect!
I use it since many years ago.

--

+ Ken +