[Stoves] Variable Speed Stove Fan

[steve]

> But well worth it!!!!!   I turn the knob-stem and the
> 12-volt blower  that I have
> goes from stand-still to full speed.  But it does have a
> modest humming noise all the time that the current is
> connected.

Thats why the operating frequency is important. Its nice to
get them into the ultrasonic.
> I have not heard
> it called "type D",

Type D applies to signal amplifiers - like an audio
amplifier, not to motor control.

Like I said, I'm happy to put a kit of bits together, or
build working units in moderate quantities. We have a pile
of (expensive, idle) kit at work for such things.

Steve