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Suppose if you connect the output of the
PWM to a relay circuit and the other side of the
relay is connected to fan, then if you vary variable
resistance then the speed of the fan will change. You have seen
blinking lights at Christmas, you can make this
using a 555 astable by connecting the output to a
relay.
Another one is this
http://www.nomad.ee/micros/pwm555.html
Here i have explained PWM not in much detail(compared to
communication side). So more explanation can be obtained from
http://www.powerdesigners.com/InfoWeb/design_center/articles/PW
M/pwm.shtm
http://www.bobblick.com/techref/projects/sv2pwm/sv2pwm.html
http://homepages.which.net/~paul.hills/Circuits/PwmGenerators/Pwm
Generators.html
http://www.embedded.com/story/OEG20010821S0096
http://www.solorb.com/elect/solarcirc/pwm1/
http://www.4qdtec.com/pwm-01.html
http://www.netrino.com/Publications/Glossary/PWM.html
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