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Designing a linear regulated power supply

Sir, i would like u to help me designing a linear regulated power supply. its specs are as such: 12V , 300mA. the ckt diagram. moreover, hw do i decide the ratings of MOV and fuse used in the protection ckt.

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What you are doing is over **** for 300 mA, now if you will pulling some real wattage then you would need linear regulation.
just use a 10.00 ac adapter . or a zener diode .
the calculations in real time analysis is complex GE has the formula online . but a spike at 300ma will be assorbed by the transformer easilly. if you are protecting delicate circuit then a fuse will not work quickly enough , fry and blow is all they do.
a crowbar circuit is what most designers use nowdays.fast and efficient.
There are plenty of IC regulators on the market that will give these specs but I think your are over thinking your needs unless you have an exact spec for medical research.

Posted on Mar 09, 2008

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http://pcsupport.about.com/od/insidethepc/a/atx-pinout-24-pin-12v-psu.htm
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