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3 components?

Discussion in 'General Electronics Chat' started by hantto, Dec 28, 2002.

  1. hantto

    hantto Member

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    Hi all!
    I found this old 300bytes external modem, and i took it to get some free parts. When i opened the box i found 3 components that i dont know what they do... heres a pic of them:

    [​IMG]

    On the first one there reads someting like "~Pm 230 32"
    On the second "480F-X205"
    And on the third "501028" wich i think is the manufacturing date... it looks like some cind of transformer...

    BUT if you know what they are plz tell me!

    Greets!
     
  2. kinjalgp

    kinjalgp Active Member

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    The third one seems like isolation transformer. No idea about 1st and 2nd.
     
  3. bogdanfirst

    bogdanfirst New Member

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    i think the first is a diode, an old type of, or it might be small soil..try mesure its resistance.....
    about the second, i dont know what it is....i also bought an old ISDN controller and it has 2 things that loog just like it, i searched the net, but couldnt find anything about it.....
    the third i'm sure it is a transformer, old modems uesd thme for insulation, most like a telephone uses them, new ones have other type of separation methods and protection....
    ill search the net and c what i can find.....
     
  4. dave

    Dave New Member

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  5. mechie

    mechie New Member

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    Telephone Line Protection

    I am sure the first component is a Varistor - it will seem open-circuit until it sees some high voltage across it (maybe 100v ?) when it becomes a near short.

    It will be directly across the incoming telephone lines and provides lightning protection to the equipment. These things are now built into (UK) telephone master sockets so plug-in gear no longer requires them as the socket does the protection.

    The second might be a low-pass filter but could be more line protection.

    The third, I agree, is a line transformer.
     
  6. hantto

    hantto Member

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    Thanks for the help!
     

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