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Dose anyone know haw to make a good 12v U,P,S (Uninterruptible power supply)? Answered

Hi i am trying to make a UPS for a 12v project
I'm using a relay diode & capacitors
and my idea work but at the switchover it drops from 12v to 7v then back
to 12v so has anyone got a good design


Computer PSU+car battery

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