Connect with us

NC CONTACTS

Discussion in 'General Electronics Discussion' started by kwame, Apr 28, 2011.

Scroll to continue with content
  1. kwame

    kwame

    4
    0
    Apr 28, 2011
    Hi
    i have ordered 1 channel opto-isolated IO relay board for a project work.I want install a siren that will be backed up with a 12 VDC car battery(battery backed) so that the siren will sound in the even of power failure.
    I Have read that it possible to achieve this by extending the alarm leads to the N/C contacts as there is continuity in NC contacts when the coil is de-energized
    .Is it possible to achieve this end?
    This anyone have hands on experience in this field?Please help!
     
  2. shrtrnd

    shrtrnd

    3,826
    520
    Jan 15, 2010
    For an exact answer, we need to know the manufacturer & part number of your relay
    board. If you don't know: N/C is normally closed contacts (N/O normally open).
    You buy the relay for the type of circuit you want. Most relays have both normally
    closed and normally open contacts on the relay, you just need to wire it for the job
    you're doing. It helps a lot, when you identify the relay part number (or board), so
    we can look it up, and give a more precise answer.
     
  3. kwame

    kwame

    4
    0
    Apr 28, 2011
  4. kwame

    kwame

    4
    0
    Apr 28, 2011
    Hi
    the whole circuit is going to look like maintained emergency lighting system.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-