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Wrong PSU - Please help?

Discussion in 'Electronic Basics' started by [email protected], Apr 8, 2007.

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  1. Guest

    I want to learn a little about PSUs transfomers can anyone point me to
    some links which could prove useful. The reason I ask is that I have
    purchased a ADSL router on eBay recently and I think that the PSU may
    be not be suitable/not the original one. It is a Netopia 3341,if
    anyone is familiar with it. I have seen and fitted a number of these
    routers and they usually are supplied with laptop type power brick PSU
    - this one is not. This is not what concerns me. The router has an
    input of 12VDC, 1.0A (labelled on the underside of the device) and the
    PSU is labelled as:full label is Input 230V ~50Hz 140mA, Output

    Is this correct and safe to use or could I damage the router. Do you
    think that this was indeed the PSU which was supplied by the
    manufacturer. I would have expected output to be 10V. Please advise
    and explain so that I may learn something and put my fears to rest.

    Any help and advice greatly appreciated.

    Best regards,

  2. What country? What is your local voltage?
  3. Eeyore

    Eeyore Guest

    In all probability (99.99% or so) your router doesn't actually require 12V. It's
    likely that the manufacturer specified 12V because it was convenient to obtain
    power bricks of that voltage.

    I can't see any way you can harm it by using the 10V brick to be honest. It's
    likely to run cooler in fact which is no bad thing.

  4. Guest

    Thanks for the advice Graham

    Actually, I had noticed it ran cool - both the PSU and router - it is
    working i just want to make sure this is okay.
  5. Guest

    UK = 240V :)
  6. It's probably close enough and will work in that case.
  7. Pete D

    Pete D Guest

    As said earlie it will probably be fine, there is likely to be a voltage
    regulator inside the router which will convert the 12V or 10V DC to what
    it actually needs, most logic runs on 5V or less.
    Re the 1A on the router that will ba the maximum it will require so
    having a 1.2A supply which actually means that is the maximum it will
    supply, will have no effect. The reason it will run cooler is because it
    is having to lose less volts at the required current hence it dissipates
    less power. The only wat it may fall over is if parts of the circuit
    need a higher voltage than 5V, such as say 9V, if this is the case the
    voltage regulator may drop more than the needed 1V in which case it wont
    So if it is working then the only effect will be that it takes less
    power and therefore runs cooler.

    Hope this helps you out.

    pete d
  8. Lionel

    Lionel Guest

    If it's working reliably, but cooler, it may well be a deliberate
    improvement by the manufacturer. I've seen many similar devices
    that've had reliablility problems from running too hot.
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