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Charging a battery with a PC psu Answered

I am making a boom box with a car stereo, PC power supply and a 12v battery. Is there any Circuit I can make or use to safely charge the battery. My main concern is back feed and killing the psu.


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1 year ago

The backfeed can be solved with a diode in series, however you won't get the required 13.6 to 13.8V to properly charge the battery.
If you don't like messing around a lot with the PSU get an adjustable step up converter rated for the current you need.
You should be able to run the converter and stereo at the same time from the PSU.
Adding a switch to select between mains power/chargin and battery power is recommended.
Same for proper fuses.