Linksys WRT54GS Power Supply Question

Discussion in 'Cisco/Linksys Wireless Routers' started by links, Aug 4, 2006.

  1. links

    links LI Guru Member


    I have just got a WRT54GS v1 off ebay (I also have a WRT54GS v4).

    However, the power supply doesn't have linksys on it and is rated at 7.5v 1000mA. I guessing they guy has given me the wrong one as my other WRT54GS has a 12v power supply with the linksys logo on it, and the documentation for both mentions a 12v supply.

    Can anyone confirm what power supply the WRT54GS v1 should have?
  2. foxwalker

    foxwalker Guest

    As far as I know you just have to be sure that the voltage, amper and hz are the same as supposed for this type of equipment. You should be able to see that in the manual that goes with the router.
    I myself have a WRT54g from USA - it came with a 110V of course, I got a new power supply with 220V and it works fine. I jjust checked the above mentioned points..... :thumbup:

  3. asterger

    asterger Network Guru Member

    Have a G and an SL. Both of those came with AC adaptors rated 12v @ 1A.


    -- Alan
  4. u3gyxap

    u3gyxap Network Guru Member

    WRT54GS v1 comes with a Linksys branded power supply, 12v 1000mA.
  5. shadowmasterPL

    shadowmasterPL LI Guru Member

    Internally, WRT54 routers are using two voltages - 5V and 3,3V. There are two switching voltage regulators on the router's mainboard (you can see two coils on the left side of the board, and two Anachip's AP1513 step-down DC-DC converter chips - WRT54G v5).
    Router should work with voltages as low as 6V and as high as 17V (maximum input voltage for the regulators is 18V).

    Linksys branded power supply is not stabilised one, and without a load outputs about 16V - nothing is burning ;)

    So, if it works then just don't worry.
  6. links

    links LI Guru Member

    Thanks all. :thumbup: I did try the power supply before I saw your reply, and it seemed ok.
  7. u3gyxap

    u3gyxap Network Guru Member

    Not sure if 1000mA of 7.5V is enough. 6V 1000mA was not enough for me and the power supply got melted down (literaly) after about 24hrs of use.
    Get a generic 12V 1000mA power supply if you get a chance, just to be safe.
  8. gaogi

    gaogi Network Guru Member

    Original power supply is 12V 1A, which translates to 12 watts of power. your 7.5V 1A adapter only supplies 7.5 watts of power. I would try to find a power adapter that puts out at least as much power (in watts) as the original power supply.
  9. shadowmasterPL

    shadowmasterPL LI Guru Member

    ... or if you own a multimeter, you can measure how much current does the router need in practice (when using the 7,5V PSU).
  10. HennieM

    HennieM Network Guru Member

    Somewhere on the net it's posted that the WRT54 routers draw about 0.46A from the stock supply, with some 0.02A jumps as wired clients are connected. That makes it about 6W. So, a 6V 1A supply would be running full blast to keep up, while a 7.5V supply (which probably supplies 9V or so unloaded if a transformer type) should run at about 80%. It might do, but will most likely get very warm. The suggestion of a 12V/1A generic supply is your best bet IMHO.
  11. WhiteFox_c

    WhiteFox_c Guest

    12VDC 1A (Positive center) confirmed with WRT54GS V2.0
  12. HennieM

    HennieM Network Guru Member

    I tested the power requirements of a WRT54GSv5.1 and a WRT54GLv1.1 recently. Both routers had just AP+WDS at 84mW, and only wireless clients, so everything I did not need at the time was disabled.

    Both routers draw about 220 - 250mA at 12.6V = about 3W
  13. links

    links LI Guru Member

  14. u3gyxap

    u3gyxap Network Guru Member

    IT, that will be suitable.
  15. HennieM

    HennieM Network Guru Member

    The WRTs do not require a regulated supply, but a semi-regulated one, as far as I can tell, as it has voltage regulators on-board. This means the supply must have at least some smoothing capacitors, as the WRTs don't have smoothing caps on-board. Smoothing caps makes rectified AC a little "smoother" (just like the name says...)

    Looking at questions/answers/comments on the Maplin page, it is not clear whether this supply contains smoothing caps. Maplin also seems to suggest a different supply (VN10L) on a question for driving a router at 800mA.

    Some of the Nokia power supplies (different game but I'm just trying to make a point) contain just a transformer and a rectifier - no smoothing. For a "smart" phone that does its own charging regulation this is OK, but it would not work for a device requiring smoothish DC (to make regulated DC on-board).

    I would think that an adapter sold as an "AC/DC adapter" would do a little smoothing though, but maybe you can ask them.

    Also, be sure to run it at 12V, positive center.
  16. afishe2000

    afishe2000 Network Guru Member

    I have my routers running on IBM Thinkpad power supplies so the are multi-voltage. Plenty to be found on eBay.

    Copied from Digg:

    by tievolu on 4/05/06
    [comment buried, show commenthide comment] + 0 diggs That's odd.

    The power supply that ships with the WRT54G is 12V, and the unit can accept a very wide range of input voltage (between 4V and 27V for a regulated power supply). Have a look at this site:

    which specifically recommends using laptop power supplies to power your WRT54G (speicifically, IBM Thinkpad power supplies are known to work well).
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