Electronics > Beginners

Compact power supply

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KrudyZ:
Since this is the beginner's section and you declared yourself to be a noob, maybe it should be mentioned that working on circuits directly connected to mains can easily kill you.
Even if the final product is completely (double) insulated, you would still need to test it while you bring it up.
Without the right knowledge, experience and equipment, you put yourself in danger.

That being said, your requirements are very close to what USB or phone chargers provide.
It is extremely unlikely that you will be able to do better than that, considering they are being designed by specialist and being produced by the billions every year.
I would recommend that you find yourself the smallest USB adapter and take it apart. Remove the AC plug and USB connector and see what's left. If that doesn't fit, get another one. If none of them fit, change your size requirement so that it does.

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