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Making your own twisted shielded pair?

Discussion in 'General Electronics Discussion' started by xTamx420, Mar 23, 2015.

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  1. xTamx420

    xTamx420

    20
    1
    Feb 16, 2015
    Hello,

    I was looking at spools on 2 conductor twisted shielded pair yesterday and it was way more expensive than I thought it would be. ~150/100' on digikey.

    So I was thinking it looks easy enough to make. If I simply twisted my own wires, wrapped them in tin foil and heat shrinked it would that be good enough? What exactly is the shielding material? Would tin foil be good enough? Does the shielding have to be wrapped in a certain way?

    Alternatively, does anyone know where to get some cheap 2 conducter twisted shielded pair cable? 18 to 20 gauge?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,820
    2,440
    Nov 17, 2011
    Your cable will be rather stiff if constructed this way. I don't think making your own cable is worth the effort, neither will you save money (did you have a look at the prize for shrink tube?)

    Digikey is not an inexpensive ressource. I couldn't help you here, but your favourite search engine surely will turn up with lots of hits.
     
  3. shrtrnd

    shrtrnd

    3,783
    499
    Jan 15, 2010
    What you're looking for is THE most common type of signal wire for industrial applications. Do you have an electrical/electronics liquidator in your area to buy some left-overs from?
    I often recommend checking local Ham Radio 'Hamfests', which are electronics parts gold mines for excessess material. Google Ham Radio clubs in your area for upcoming 'Hamfests'/swap meets.
    Surplus sale companies in your area. Anybody who would have industrail signal wire left-overs. Heck, recycle places are getting wire hand-over-fist from people trying to capitalize on scrap metal prices, you
    might find something there.
     
  4. davenn

    davenn Moderator

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    Sep 5, 2009
    you are going to have a problem in that you cannot solder to aluminium foil
    and you do need to be able to connect to the shield at each end of the cable
     
  5. Tha fios agaibh

    Tha fios agaibh

    2,115
    713
    Aug 11, 2014
    I agree, It's not worth your while.
    The foil usually has an insulating layer on the inside to insulate the small drain wire for the shield. Another thing is when you twist the wires, it will shrink about 1/3 of your original length.
    Whether or not it's good enough, depends on what your using it for.
     
  6. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    Why not just get hold of some cheap FTP or FFTP network cables and chop the connectors off. They use quite small gauge wires so not sure if they will work for you. You don't say what signal the cable is carrying. You could join the wires together to increase current handling capability.
    Adam
     
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