DPDT On-Off-On to On-On-On?

Discussion in 'General Electronics Chat' started by djex, Mar 17, 2011.

  1. djex

    Thread Starter New Member

    Feb 26, 2011
    15
    0
    I have a DPDT switch that is On-Off-On and I want to use it as a On-On-On (3 position selection switch). I've had a few ideas on how to wire it but I think there might be an easier way than my idea of using a NOR gate to turn the middle off to an on which I still don't think it would work like I want it to.

    So how would I go about wiring this? I know I should use a proper selection switch but I don't have one and would like to use what I have at the moment.
     
  2. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    The only way I can think of to do what you want is to use relay logic. By interlocking the relay contacts between themselves, LEFT ON picks up relay #1 whose contacts would disable relays #2 and #3. RIGHT ON would pick up relay #2 whose contacts would disable relays #1 and #3. The CENTER OFF position would insure that relays #1 and #2 were both off and their NC contacts in series would pick up relay #3. Relay contacts would then be tied to the loads. You should start by sketching out a Ladder Logic diagram to check it out.
     
  3. billbehen

    Active Member

    May 10, 2006
    39
    1
    sounds OK if you have the right DC available for the NOR gate, assuming the result only has to be logic level i.e. you're not actually switching some signal or a power level with lots of mA
     
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