On Thu, 13 Jan 2005 02:12:17 GMT, golf wrote:

If there is any one here that can help me with theory of PWM,

Any searching ought to give you the basics - it's a very common
technique.

For motor control designs, then take a look at the 4QD site
http://www.4qd.co.uk/
http://www.4qdtec.com/pwm-01.html

It's a while since I looked, but these people were reckoned to be
_the_ best (better than Vantec) for DC battery-powered motor
controllers - Robotwars! They also had a detailed and useful FAQ /
explanatory section.

--
Smert' spamionam