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Main => Main Forum => Topic started by: JudgeRob on November 24, 2015, 09:44:51 pm

Title: 2nd PSU?
Post by: JudgeRob on November 24, 2015, 09:44:51 pm

I was thinking of using a second ATX PSU to drive LEDs, etc.  It seems like extra lights and such might draw too many amps off the poor PC PSU.  Anybody have problems with PSU burnout from too much power draw of a singular PSU?

Title: Re: 2nd PSU?
Post by: mgb on November 24, 2015, 10:09:01 pm

If the PC psu can handle it, amp wise, there's no big deal but it doesn't hurt to dedicate a psu to the lights and what not.
There are many cheap psus available online in 5volt, 12volt, etc.

If you choose to use an old atx pc psu you may have around, just remember that you will need to jump the power start wire to ground. This is the green wire at pin 14

Title: Re: 2nd PSU?
Post by: JudgeRob on November 24, 2015, 10:58:19 pm

I have an extra one I might use just to prolong the life of the one in the PC.  I guess it depends if I need more than just a few LEDS.  I'm not sure yet.  One thing is, although LEDs are pretty efficient, now that they are all superbright and RGB, they suck up a bit of power.

The other thing to remember is not only to jump the wire, but there also must be a certain power draw on the PSU or it will shut off.  I had that issue on another LED project and have to use a power resistor just to keep the PSU on!

Thanks dude.  8)

Title: Re: 2nd PSU?
Post by: paigeoliver on November 24, 2015, 11:41:31 pm

You don't need two power supplies for LED lighting unless you have gone far beyond the realm of arcade game and into the realm of 1980s Vegas casino signs.

Title: Re: 2nd PSU?
Post by: ventrra on November 25, 2015, 01:07:53 pm

Quote from: paigeoliver on November 24, 2015, 11:41:31 pm

You don't need two power supplies for LED lighting unless you have gone far beyond the realm of arcade game and into the realm of 1980s Vegas  Casino sign.

Ooh. A 1980's Vegas Casino themed arcade machine sounds awesome!  ;D I wonder if anyone has had the nerve to make one? ???

Title: Re: 2nd PSU?
Post by: JudgeRob on November 25, 2015, 07:26:07 pm

I thought about it briefly, but I don't think I could pull it off.  I've got a few hundred RGB LEDs in my TV room though!  I power those with an ATX PSU.

Title: Re: 2nd PSU?
Post by: TopJimmyCooks on November 25, 2015, 10:06:21 pm

I have two in the switchcade machine- the pc has a dinky sff that came with the case, while the rotation motor and lights, etc. are on a $14 crap ATX psu. 

Title: Re: 2nd PSU?
Post by: JudgeRob on November 25, 2015, 10:53:41 pm

Yeah, I think introducing motors with torque, etc., would certainly warrant some consideration for a 2nd PSU.  Esp if one has some bad-ass video cards sucking up juice.