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Normally closed glass reed switches

Discussion in 'Hobby Electronics' started by Heywood Jablome, Apr 17, 2006.

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  1. Just looked at RS, Jaycar and Dick Smiths,

    I'm looking for a glass reed switch that is normally closed. Can't seem to
    find a supplier that has any for a decent price.

    I need 50 of them and while most people dont stock them, RS wants over $4
    each. Im too tight to pay that much as I can see that Electus has the
    normally open variety well under a dollar. (but no normally closed ones)

    Anyone have any other suppliers they care to share?
     
  2. atec77

    atec77 Guest

    They come in the elcheapo DS alarm it so they must be available . I
    sourced some a while back from direct alarm supplies at a very
    reasonable price .
     
  3. Kevin Martin

    Kevin Martin Guest

    Well if I look at DSE page and do a search for reed switches. The top of
    the list is a N/C one for $1.50 (P7856). What's the matter with you? I'm
    sure they will do a better price for 50.

    Kevin Martin
     

  4. Thanks Kevin but the search continues. The Dick Smith reed switch is
    normally closed in the presence of a magnet. To me this means that it is
    normally open in its normal state (form A). Some may disagree with my
    terminology.

    In any case I need one that stays closed when not in the presence of a
    magnetic field, and opens when a magnet is brought towards it. This is a
    little harder to find but its not impossible. I purchased a Form C reed
    today from RS components. At over $6 it was OK for one prototype but not
    good enough for quantities of 50 plus. (they only give you a dollar off at
    25 units)


    So the question remains where I can get a normally closed glass reed switch
    at a decent quantity price sub $1.
     
  5. I think you are talking about the plastic box ones. I'm after the glass reed
    insert that is inside them. Just the insert, not the casing. I don't think
    DAS would have them.
     
  6. I think you are talking about the plastic box ones. I'm after the glass reed
    insert that is inside them. Just the insert, not the casing. I don't think
    DAS would have them.
     
  7. sam

    sam Guest

    If worst came to worst, could your application use a transistor inverter circuit with a normally
    open switch?

    Cheers,
    Sam
     
  8. atec77

    atec77 Guest

    no , ring them and ask
    I'm after the glass reed
    ring them and ask
    Just the insert, not the casing.


    I don't think
    I believe you
     

  9. No worries. I'll call them, thanks.
     
  10. John Dunkley

    John Dunkley Guest

    It is possible to 'bias' a NO reed switch with a small magnet to make it NC,
    and then use your main magnet to bias it off.

    I know this works because I have done it.

    Just need a supply of small magnets and position it to bias the reed switch
    on.

    JD
     

  11. Nope. They are normally open.
     
  12. two bob

    two bob Guest

    Just looked at RS, Jaycar and Dick Smiths,
    SM1002 is a N/O switch.
    It may be easier to find a changeover than a N/C
     
  13. two bob

    two bob Guest

  14. I like your lateral thinking Jasen, it would be interesting to know if that
    arrangement would make a reed switch last longer or shorter.

    Mark K.
     
  15. two bob

    two bob Guest

    Thanks Kevin but the search continues. The Dick Smith reed switch is
    Sounds very hit and miss to me, and very unreliable.
     
  16. Aussie Medic

    Aussie Medic Guest

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