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Single power supply for multiple peripherals

Discussion in 'Modding Forum' started by psychowood, Jun 2, 2009.

  1. psychowood

    psychowood LI Guru Member

    Preface: I know this post probably isn't "real" modding, I just thought that it could fit this section a bit more than the General Discussion one.

    Today I noticed for the first time how many 12V peripherals I have (6 to be precise, being a modem, a router, a DVB-T decoder, a low-power server, a NMT and a NAS, probably destined to grow in number), all on the same shelf, every one using relatively small power supplies (3A max, mostly 1A).

    I was wondering, would it be dangerous (I can't trust my scholastic knowledge in electronic anymore :D ) to buy a single hi-powered AC-DC converter (say, 10A or more) and connect every peripheral on its single output using a parallel connection?

    I don't want to blow up my Linksys stack... :rolleyes:
  2. MAS3

    MAS3 LI Guru Member

    You might experience some strange effects because of this.
    Right now, most items might be connected on signal level.
    But they are galvanic isolated, meaning their power supplies are not connected.
    I have no idea if changing this might serve you trouble.

    But if you decide to do this, you'd better put a fuse in each powerline to the separate peripherals.
    That way you might prevent fried peripherals.
  3. OldTimeCoder

    OldTimeCoder Addicted to LI Member

    We never did hear what you did. But I did try something like that one time....

    I dunno about stuff now-a-days, but about 10 years back, I had a sweet set of powered speakers plugged into my then current desktop, multi-range Logitech's, with tweeter, mid-range and woofer with ports. With wear and tear and so forth, the power adapter block finally quit working. Now being a pack rat on "things that still work even though the rest of the parts went into electronics recycling" kind of guy, I had the honking BIG adapter from another salvaged Logitech surround system's sub-woofer. I remembered it had the same voltage spec as the bad block. The bad block was cubish, about 1.5 inches on a side. The Big adapter (about 6" on each side) had a much higher power rating (over 10X as I remember) and was massive enough to have aluminum fins on the housing. I checked the connectors, and by George, polarity, pin and barrel size were all the same on both. However, the Sub-woofer block had a much heavier wire. (I should have known....)

    Plugged it in, and fired up the sound system on a FP Shooter game. Went in, put the cheat code in for all weapons and went crazy testing the effects. It seemed like that the sound really was louder now.... And about two and a half minutes later there was a loud Boom - Screech - Pop as the speaker with the electronics and controls blew out spectacularly. My son swears he saw it jump.

    Scratch one set of nice speakers, (separate bass/treble controls, balance and volume dials, with a nice on/off button). Just lucky I didn't blow out my sound card too! Don't know if it was indeed over powered for the speakers or if there was an electrical fault that finally manifested itself.

    Not something I want to repeat.

    That's my story and I'm sticking to it! . . . . /s/ BezantSoft
  4. uridium64

    uridium64 Connected Client Member

    I had the same idea a while ago, but I didn't realise it until know. Probably a good idea to check for risks first by asking an electronic technician I do know personally.

    Delock sells 2.1mm barrel-plug splitters, which could be handy for this issue:





    The original idea was to use it with something like this:


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