----- Original Message ----- From: "Joe Smalley" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, September 10, 2002 8:55 PM Subject: Re: PWM speed controller frequency?
> That is like asking a musician for his favorite note on the scale. > > My car sounds about middle C but it annoys an awful lot of people. > > If I were doing it, I would put it above 22 kHz so it only annoys the dogs. 25kHz, otherwise it will annoy the dogs and the Sheers. The trick is to balance switching losses against noise. However, for a scooter, it probably doesn't really matter that much. S.
