Reply With QuoteIs there a voltage adjustment screw in the psu
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Bucking 13.2v
I just got a nice donation of big 13.2v power supplies, used for led floods. Do I need to bother bucking it to run resistive 12v pixels? I'm used to buck converters needing a minimum 2v drop, and I'm not used to bucking 50 amps' worth of current. Was hoping to just run 30 feet of wire and that that wouldn't wear-and-tear the pixels too quickly.
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Re: Bucking 13.2v
Is there a voltage adjustment screw in the psu
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Re: Bucking 13.2v
Not on these.
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Re: Bucking 13.2v
I suspect you would not have an issue up to 14v. However, using regulated strips would remove all risk
2022 - Not sure yet. At least two new songs.
2021 New Tune-to sign. New 40x27 matrix at the house. Retiring the Strip based matrix. Updating some of the old window frames to the new house. Adding two new songs.
2020 Full sized show reworked for the new location. Only adding (famous last words) 13 RBLs that I finally got converted to using pixels
2019 - Just moved into a new home (yet another change of plans). Will be dim but not dark. Too much to do at the new place to leave time for a show. Dim show (3000 pixels) had regular visits most nights.
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Re: Bucking 13.2v
30 feet of 18 gauge wire should be good for about 1V drop. That should work pretty well.
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Re: Bucking 13.2v
Wouldn't a couple diodes drop the voltage by 1.2v I think silicon diodes have a .6v drop. just make sure they can handle the current. I am not an electrical engineer so please get a second opinion.
Supporting Member
Re: Bucking 13.2v
0.7V drop to be precise, but a good guess! You could also use a zener diode.
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Re: Bucking 13.2v
I was thinking of using these PSU's on my 12v single-line props and switching them with NMOS fets, only switching the vdd line instead of GND. Then I don't have to worry about bucking all 55amps at once, with one converter--I need only switch one prop at a time. That might actually be a pretty sweet arrangement.
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