DPDT relay with off postion?

dbc1218dbc1218 Posts: 33
edited February 2007 in Robotics Vote Up0Vote Down
Does anyone know where I can get a DPDT (double pole double throw) relay with an off position? I know you can get switches like this with a center off position but didn't know about a relay. I want to use it for a project, using a remote control car that has differential steering, to control one of the two motors. I don't even know if something like this is made but maybe one of you guys have seen it.
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  • 6 Comments sorted by Date Added Votes
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 19,524
    edited February 2007 Vote Up0Vote Down
    How about two DPST relays instead? You'd need two actuation signals anyway for a center-off relay. 'Might as well just use two regular relays.

    -Phil
    “Impossible is just a big word thrown around by small men who find it easier to live in the world they’ve been given than to explore the power they have to change it. Impossible is not a fact. It’s an opinion. Impossible is not a declaration. It’s a dare. Impossible is potential. Impossible is temporary. Impossible is nothing.” –Muhammad Ali
  • Bruce BatesBruce Bates Posts: 3,045
    edited February 2007 Vote Up0Vote Down
    dbc1218 -

    Such DPDT C/O relays have two coils. One coil actuates the armature in one position or direction, and the other actuates it in the opposite position or direction. If neither coil is actuated, the relay self-centers for an "OFF" position.

    More information can be provided, if you provide some specifications. The primary concerns here are voltage, amperage and mounting.

    Regards,

    Bruce Bates

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  • crgwbrcrgwbr Posts: 614
    edited February 2007 Vote Up0Vote Down
    You could also just use 4 spst relay in an H-bridge pattern.

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  • dbc1218dbc1218 Posts: 33
    edited February 2007 Vote Up0Vote Down
    You guys are right with the multiple relays and you would need the same number of control signals. I think thats going to be the easiest way to go. Thanks for the help.
  • slamerslamer Posts: 52
    edited February 2007 Vote Up0Vote Down
    If you looking for RC switches. these little guys work great. We use them in RC combat robots all of the time.. They accept standard PWM signals from a receiver or you can control them with a Basic stamp2. From what you posted you probably could use the RCE 220 to control the on/off direction of a motor. You can wire it to work as an H-bridge with a couple of jumpers.

    http://www.robotcombat.com/marketplace_teamdelta_rc.html

    These fine products are made by Team Delta...

    http://www.teamdelta.com/

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