can i use a 12 volt battery on a 9 volt device ?
And why the 200µF capacitor?
Why not 10?
Too small to absorb the variations
Why not 1000?
Way too big for the voltage.
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With a 78xx, you don't need 200µF on the output. 10 is more then adequate -
that is what the regulator is for. Be sure to put a 100nF or so cap in
parallel with it.
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