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Thread: Compatible Power Jack for IBM 5140?

  1. #1

    Default Compatible Power Jack for IBM 5140?

    I'm looking for a power plug for my PC Convertible and I've only seen one untested on eBay. Was wondering if there were any generic alternatives and if anyone had links to where I could purchase one. I know it's 15v, 2.7amps, center positive. I don't know barrel size or anything else. If anyone had info or maybe even a tested spare I'd be incredibly grateful for any info.

  2. #2
    Join Date
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    "5.5 x 2.5" is included at [here], which sounds like:
    Outer diameter of plug = 5.5 mm
    Diameter of hole = 2.5 mm

    Such a connector is shown at [here].

  3. #3

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    Ive been searching and have yet to find one that meets all of my specifications. I do not want to vary on voltage or amps, but would there be a safe tolerance for doing so? Alternatively, if anyone has a link to the corecct power supply, it would be much appreciated.

    So far I've found, in the correct dimensions:

    15v, 1.5 amp
    15v 2 amp
    15v 3.5 amp
    15v, 4 amp
    15v, 5 amp
    Last edited by username1; October 9th, 2017 at 06:54 PM.

  4. #4
    Join Date
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    The image above is taken from the 5140 technical reference.

    1. Play safe and get a regulated (i.e. voltage stable) power supply. 'Regulated' is further described at [here].

    2. The "40 watts maximum" in the IBM specification is the key.
    We play safe by assuming that it applies to any voltage between +10 Vdc and +16 Vdc.
    - So if +15 Vdc is supplied, the maximum current drawn by the 5140 is about 2.7 amps (40W/15V). A regulated +15 Vdc power supply rated at 2.7 amps (or more) maximum is suitable.
    - So if +12 Vdc is supplied, the maximum current drawn by the 5140 is about 3.4 amps (40W/12V). A regulated +12 Vdc power supply rated at 3.4 amps (or more) maximum is suitable.

  5. #5

    Default

    Thank you so much, I should definitely be able to find one now.

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