go > 20KHz. Above the human hearing range. Below that, you
may hear some motors making noises.


----- Original Message -----
From: Bob Russo <brusso@MAILHOST.ICONN.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, May 23, 1999 11:09 AM
Subject: DC Motor PWM frequency


>    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
> _________________
>