Voltage drop over capactors

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hi guys, have problem 5v on 0.1uf cap drops 1.8v, i'm not sure if have bad batch of caps or don't understand fundamentals electronics yet.

i advised add these .1uf caps 328p vcc , avcc reduce noise, here's schematic if helps @ all.

thanks!!

c1 wrong.  1 lead needs connected ground (it doesn't matter one).


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