On 21 Jun 2011 at 18:02, Barry Gershenfeld wrote:
> I have, what was to be a simple controller, that suddenly got an addition=
al
> job of controlling an LED backlight.  Dimming is done via PWM, and the sp=
ec
> states a max frequency around 250 Hz.

Wondering what factor(s) dictate the max spec of 250Hz? A minimum spec woul=
d=20
be important to minimise flicker. Even so LED flicker can be noticeable wel=
l above=20
250Hz in some conditions. If there is no good reason why not then higher fr=
eq=20
would be better and your problem goes away.

--=20
Brent Brown, Electronic Design Solutions
16 English Street, St Andrews,
Hamilton 3200, New Zealand
Ph: +64 7 849 0069
Fax: +64 7 849 0071
Cell: +64 27 433 4069
eMail:  brent.brown@clear.net.nz


--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.