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Thread: Low-voltage switch circuit.

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    Sprinkler Guy Wet_Boots's Avatar
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    Default Low-voltage switch circuit.

    I've seen one or two homes that had wall switches without any line voltage in them. I'm not sure what history would lead to someone having a rack of relays in the basement utility room sending power to ceiling lamps.

    One set of switches I recall involved something more practical, and that's why I'm posting this. These switches were controlling lights in and around a swimming pool, but with all the power coming from the pump room in the pool cabana. I remember these switches weren't controlling relays, but were closing a secondary circuit in some sort of transformer arrangement that I can't recall. I'm pretty sure the closed switch in the secondary circuit made for an increased magnetic field that was used to close contacts, so the function was like a relay, only there was no specific coil with a voltage rating needed to operate it.

    Any of this ring a bell? I rather liked the simplicity of the concept. I saw a data sheet for these low-voltage (or nearly "no-voltage") switching devices, but I just can't remember enough to locate them again.

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    Electrical Contractor/Instructor jwelectric's Avatar
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    Low voltage switching of lights was a big thing years ago. What I have dealt with had a master control located in the master bedroom that controlled all lights.

    What you seem to be describing at the pool is X10 switches.
    http://x10pro-usa.com/

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    Sprinkler Guy Wet_Boots's Avatar
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    Definitely not X10. Much more low-tech. Strictly transformer wiring and magnetism. The control circuit wasn't labeled as having any particular voltage or current. It was a UL-listed device, and not a home-brew circuit.

    I should add that this particular device could have predated the transistor - it was that low-tech
    Last edited by Wet_Boots; 10-03-2013 at 01:39 PM.

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    Jack of all trades DonL's Avatar
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    Default Must be FM

    Quote Originally Posted by Wet_Boots View Post
    Definitely not X10. Much more low-tech. Strictly transformer wiring and magnetism. The control circuit wasn't labeled as having any particular voltage or current. It was a UL-listed device, and not a home-brew circuit.

    Was it Magnetism or Hypnotism ?


    Name:  Hypnotism.jpg
Views: 95
Size:  4.9 KB


    http://www.astrologynspiritualism.co..._hypnosis.html



    The only system that I have seen like that used SCR's and Flux capacitors.
    Last edited by DonL; 10-03-2013 at 01:51 PM.
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    Sprinkler Guy Wet_Boots's Avatar
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    I think the circuit diagram would look a bit like two transformers in a series connection, with the low-voltage switch interrupting the interconnection between transformers. I'm sure it's something more subtle, though. There might be a parallel winding involved.

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    Jack of all trades DonL's Avatar
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    Quote Originally Posted by Wet_Boots View Post
    I think the circuit diagram would look a bit like two transformers in a series connection, with the low-voltage switch interrupting the interconnection between transformers. I'm sure it's something more subtle, though. There might be a parallel winding involved.


    It may have been like these,

    http://www.douglaslightingcontrol.com/specifications

    Would be great for a Smart Home.


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