Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "designer_craig" <cs6061@...> wrote:
>
> Baxter,
> Not sure what RPM the motor is running but its fairly fast.  I control the speed by modulating the power button with my finger. Guess I need to figure out how to measure it. 
> 
>


The DC fan motors can be controlled with a simple PWM circuit, 555 driving a mosfet or transistor will do the job.

The shaded pole motors in AC powered fans will usually work on a light dimmer to vary the speed.

Either way the actual RPM is not really important, you can just experiment with speed until the results are satisfactory.