"Sam Goldwasser" wrote in message
...
"Dave D" writes:

A series resistor generates heat, diodes drop voltage and run cooler..
They
can be soldered into the fan leads then covered with heatshrink
sleeving. A
6V supply will speed these fans up.

Not quite. If you have a voltage drop and current flow, you have IV=P
generates the same heat. Doesn't matter if it is a diode or a resistor.
The difference is that the power dissipation is roughly proportional to
current rather than a square function because the voltage drop is more or
less constant.


Exactly, so the diode will run cooler, like I said :-) Naturally, the losses
are to heat, I didn't mean that diodes magically dump the energy into a
black hole!

Dave