Hi,
I use some hundred Hz as it fits. I can not say why, but it works.
Imre


On Sat, 22 May 1999, Bob Russo wrote:

>         Is there any rule of thumb for the frequency one uses to
> run a (small in my case) DC motor at various speeds?  It seems
> obvious that the duty cycle determines the speed.  What's not so
> obvious is what range of frequency & why.
>   Thanks
>
> _________________
>
> Bob Russo
> Guilford, CT
> brusso@iconn.net
> _________________
>
>