On Wed, 1 May 2002, Eoin Ross wrote:

>Any ideas on how to add a speed controller to my heat gun? It looks like a
>regular ac motor driving the fan, but I haven't taken it apart yet. I'm worried
>that if I reduce the flow rate too much the coils with overheat, so maybe I need
>to regulate those too. Maybe if I add a thermocouple and use a PIC to regulate
>the fan speed and coil heating...

Switching a simple diode in series with it will reduce the power a little
(30% or so). Otherwise use a controller meant for drill speed control or
even a light dimmer. The motor is a PM dc motor and is in series with the
heater so its speed will change with the power and there will be no
overheating. However you need to check this for your fan.

Peter

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