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driving a relay with 24vdc low current IO

Discussion in 'Electronic Basics' started by CptDondo, Feb 14, 2007.

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  1. CptDondo

    CptDondo Guest

    I have a board with a bunch of TTL-level IO. It can handle a few
    milliamps (about 10) per IO.

    I would like to be able to control 120VAC loads with this board. The
    relay bank I have needs 50 ma to drive each relay; too much for my
    little board.

    Does anyone know of a ready-made inexpensive relay that can switch 10A @
    120 VAC and uses < 10ma to do so?

    On a related note, does anyone know of a ready-made solution for
    connecting a typical ribbon cable to a screw-down termblock? I have a
    16x2 0.1" header and I would like to take that to a screwdown termblock.


  2. JeffM

    JeffM Guest

  3. jasen

    jasen Guest

    solid-state relays, or add some transistors to boost the power of your
    strip the ends ans screw them down?

  4. Guest

    you could use a reed relay direct off your ttl circuit to drive a
    bigger relay through the contacts on the reed relay
  5. CptDondo

    CptDondo Guest


    I was hoping for a more professional looking solution....

    I have a header on the inside of a box, and want to take it out. This
    is in a production environment, so paying someone to split, strip, and
    screw (that sounds pretty good, actually - all depends on what they look
    like) down 36 fine wires would pay for a ready-made connector, with
    fewer problems.

  6. Rich Grise

    Rich Grise Guest

    Google "IDC Connector" - I got 149,000 hits even _with_ the quotes!

    With those, you can continue to use the header, assuming you're talking
    about one of these:

    Good Luck!
  7. jasen

    jasen Guest

    you want this connector to interface with the screw end of your termblock?

    which sort of termblock is it?
    what sort of ribbon cable are you using?

    maybe you could terminate to a PCB using a solder-in idc termination and the
    pcb also have a soldered in straight or right-angle pin-header that matches
    your terminal block.

  8. jasen

    jasen Guest

    if you can avoid using the screwblock do so,
    why noy use a DIL pin header, they make ones with locking clips
  9. CptDondo

    CptDondo Guest

    Actually, I am looking to *buy* an IDC-to-termblock cable. Something
    with a DIL IDC female on one end, and a screw-down on the other end, so
    we don't have to fabricate it. I guess I was expecting that to be
    fairly common, but since I can't find one, maybe no one else needs one. :-(

    Why a screw-down? Because our market expects it. Our customers want
    screw downs. (Yeah, I'd rather have modular connectors, but they would
    be a hard sell.)

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