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well, can anybody tell me basically what we need..i mean what factor should we consider b4 build a power supply (DC) besides current requirement, etc.
tq
Do you want to construct a variable power supply? i.e 6v, 9v, 12v?
You could use a transformer say: 240(mains)/15v and regulate this to 12, 9, and 6 volts using the appropriate regulatros i.e 7812, 7809 and 7806.
What's the current rating? I know of transformers capable of a maximum of 0.5A, 1A, 3A etc. I believe these should be available. To make a variable PS you might need a sort of switch to switch the transformer output to the desired regulator (just my own idea).
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