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adapter question

Discussion in 'General Electronics Discussion' started by VXtanyaXV, Jan 15, 2010.

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  1. VXtanyaXV

    VXtanyaXV

    37
    0
    Jan 14, 2010
    Hello,
    I realize this is an extremely basic question but perhaps someone could at least point me in the right direction.
    My router (wired) came with an adapter with the following numbers:
    INPUT: 100-120V-0.5A 50-60Hz LF
    OUTPUT: +5.0V -- 2A - == +

    It stopped working (for unknown reasons).
    The router works with another identical adapter but the original adapter does not provide power.

    Can I use an adapter that has the following specs?
    INPUT 100-240 V AC 50-60Hz
    OUTPUT: 5V ------ 2A

    Specifically: Would the 100-120V for input on the original be covered by the 100-240V?

    Where can I find out what the numbers written on the adapters refer to?

    Thanks
     
  2. Neal

    Neal

    23
    12
    Dec 23, 2009
    Assuming you are located where the line voltage is 120 volts, then the replacement is fine.
    The 50-60 hz in line frequency and the output is 5volts @ 2 amps.
     
  3. VXtanyaXV

    VXtanyaXV

    37
    0
    Jan 14, 2010
    Thank you!
     
  4. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Power in & out is ok, but:
    Observe the polarity (symbol +C*- means center is negative, -C*+ means center is positive).
    (the * is actually a dot in the center of the C, representing the physical layout of the plug)
    Most power adapters have the center as the negative pole. Chargers usually have a positive center post.
     
  5. VXtanyaXV

    VXtanyaXV

    37
    0
    Jan 14, 2010
    Hi and thank you.
    What I can read are the following:
    The Original adapter:
    INPUT: 100-120V-0.5A 50-60Hz LF
    OUTPUT: +5.0V -- 2A - == +
    - C* +

    The potential replacement adapter:
    INPUT 100-240 V AC 50-60Hz
    OUTPUT: 5V ------ 2A
    - C* +

    So this would mean both adapters have the center as Positive?
    Thanks again
     
  6. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Yes it does, so you're good to go on all electrical aspects, but I forgot to ask if the center pin fits in the center hole. They are usually 2.1mm but can also be bigger (2.3mm). If the pin is 2.1 and the hole 2.3 it will still work but feels wobbly. It won't fit the other way around of course.
     
  7. VXtanyaXV

    VXtanyaXV

    37
    0
    Jan 14, 2010
    Thanks for pointing this out! The original (broken) adapter's pin is significantly larger. It appears to have a yellow tip. So the potential replacement would wobble. Is there something to wrap around the narrow tip so it won't wobble? (BTW I have not tried it yet)

    I found another adapter with a pin which would fit (It is "class 2" though)
    Input AC 120V 60Hz 6.5 watts
    Output 6VDC 200mA
    -C*+
    (It is for a land - line telephone)

    I Found 1 more adapter for a scanner:
    AC Input: 100V-120VAC 50/60Hz 25VA
    DC Output: +12V === 1.25 A
    V- O* V+ (I guess the circle replaces C? So this would have a positive center as well?)
    Thanks again for your help!
     
  8. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Neither of the last ones will work at all. You'll just have to try put in the replacement. If the outer was larger then the center pin may be large too. If it doesn't fit I'm not quite sure what to recommend. Plugs/ leads may be swapped but it requires tools & solder skills.
    Last polarity makes no sense btw., could be a misprint, maybe a magnifying glass can reveal some more details.
     
  9. VXtanyaXV

    VXtanyaXV

    37
    0
    Jan 14, 2010
    Hi,
    Thanks for replying.
    The potential replacement will not fit - as you mention the center pin is too large.
    In the mean time, the original "broken" adapter works now. (Maybe carrying it around did something?)

    I don't see any more with a magnifying glass re: the polarity.
    (AC Input: 100V-120VAC 50/60Hz 25VA
    DC Output: +12V === 1.25 A
    V- O* V+)

    V - O V+
    The center of the diagram (the bolded O) is like a donut with an outer ring and an inner ring:
    The V – has a line ending on the outer (larger) ring; the V+ has a line ending on the inner ring.
    It is a Bestec
    Model number: BPA-201S-12
    I.T.E. power supply
    Level 3
    Thanks very much!
     
  10. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Ok! Maybe it has a fracture inside, or a break in the wire, that has shifted and is now in connection. Hold it there, don't move, don't breathe! ;)

    Quote: "The V – has a line ending on the outer (larger) ring; the V+ has a line ending on the inner ring."
    Ah, there's the giveaway; center positive. Sometimes they don't open the outer ring into a C, making it difficult to see where the center connection passes through..
     
  11. alex88

    alex88

    8
    0
    Jan 20, 2010
    Maybe just some liquid(water?) inside before, and now get dry. This happed to me before.
     
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