Connect with us

Help with wiring a 12V 4PDT Relay

Discussion in 'Electronic Basics' started by Sam, Jan 23, 2006.

Scroll to continue with content
  1. Sam

    Sam Guest

    I am trying to follow the following schematic:

    Radioshack no longer caries the listed 12V 4PDT relay. I was able to
    get a hold of a different 12V 4PDT relay, however I don't know if I can
    use it. I know nothing about the wiring of relays. The relay that I
    found has 14 pins instead of the 12 listed in the schematic. The pins
    are in 3 rows of 4 with the 13th and 14th pins on the 4th row and it
    looks like they connect directly to the coil. (I can email you a jpg
    of the schematic of the relay if this helps).

    Any help or direction would be appreciated.

  2. Dan Hollands

    Dan Hollands Guest

    A 4pole double throw relay (4PDT) should have 14 pins. 2 for the coil and 3
    for each pole.

    Probably the 3 pins in a row go to one pole. You should be able to use an
    ohm meter to figure out which pins are which

    Dan Hollands
    1120 S Creek Dr
    Webster NY 14580
  3. Chris

    Chris Guest

    Hi, Sam. First off, I think the parts list for your circuit is in
    error. That looks like a standard pinout for a 3PDT relay (note that
    pin 8 isn't listed -- it's blank in the schematic). If you look at the
    schematic and wiring diagram, you can infer there are only 11 pins
    used, as follows:

    Relay coil -- pin 4 and 12
    Pole 1: Common 3, Normally open 2, Normally Closed 1
    Pole 2: Common 7, Normally open 6, Normally Closed 5
    Pole 3: Common 11, Normally open 10, Normally Closed 9

    That looks like a standard relay pinout.

    You should be able to determine the pinout of your relay by doing one
    of the following:

    * Look on the relay case itself. Many of them have the relay pinout
    printed there

    * Look at the relay itself, particularly if it has a clear
    polycarbonate cover. Sometimes you can actually see the mechanism
    itself (do not, however, remove the cover unless you know what you're

    * Look up the data sheet for the relay. It tells all.

    If this is over your head, let us know. Also, if you could just
    provide the manufacturer and model number of the relay, we should be
    able to look it up ourselves to help. Knowing the relay model, we
    should be able to give you a pin-to-pin equivalent for your circuit,
    which might be all you need to complete what you're doing.

    Good luck
  4. Guest

    Thank you all for your helpful answers. I was able to successfully
    follow the schematic and the buzzer system is working. Could not have
    done it without your help.

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.
Similar Threads
Electronics Point Logo
Continue to site
Quote of the day