I have access to an old power supply from a battery charging system that I’m curious if I can use to power accessories (lighting mainly). Are there any “gotcha” type things I need to be on the lookout for? The adapter says it outputs 12 volts at 3 amps. I do not believe it has any of the brains of the charging system in it as it clearly says AC adapter on the case. Go ahead and use, or more details needed?
Thanks!
If it is for lighting only. And is only a power source, I don’t see why that wouldn’t work as long as you don’t go beyond the 3 amp draw. Don’t forget fuses, and on/off switches in the circut.
that is actually a good idea for lighting. Cuts back on the wiring from a central point.
shane
absolutely reuse an old wall wart.
but if you’re looking for DC, make sure it says 12V DC
Thanks guys. It has the DC symbol on it in the output description (long line over dashed lines).
I’m assuming I don’t need to look for anything else, like filtered or regulated, or goodness knows what?
I appreciate the help.
i’m in the process or wiring up some signals. i’m tapping into a nearby 12V DC supply, measures 13+ V. but the signal LEDs are bright and the small circuit i added to control them uses a 3 terminal regulator to drop the voltage. it was easy to replace an 8V regulator with a 5V.
so even if your supply isn’t regulated, you can easily add a regulator
If you’re keeping the plug part as opposed to cutting it off, it wouldn’t hurt to confirm whether the plug is centre positive or negative before plugging it into stuff. Most are centre positive, but centre negative supplies do exist.
The picture on the power supply should tell you whether it’s centre positive or negative… Or just stick a voltmeter on it
I use these with old wall warts. I bought a bunch from China for $2.00ea, they were here in 11 days.
