How PWM works ?

DCPreamp

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PWM = http://en.wikipedia.org/wiki/Pulse-width_modulation
MOSFETs = http://en.wikipedia.org/wiki/Mosfet
SMPS (for high-frequency transformers) = http://en.wikipedia.org/wiki/Smps

Google is your friend! The above links should give you some really good insight into SMPS, PWM, and power supplies in general. I would have written up an explanation, but Wiki has done such a good job, I figured I'd let the pro's start you out! You can also Google for images of the same topics you asked about and see a great variety of power supplies, parts, circuit boards, etc.

Thanks for your interest and I hope you gain some valuable insight you can use ; )
 
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