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

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
Thanks

Sandisk1duo7 years ago
Computer PSU+car battery



lemonie7 years ago
If you've got one in construction you need to tell us more about what you've got.

L