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modulated dimmer "switch"

Discussion in 'Misc Electronics' started by 2apart, Dec 14, 2006.

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  1. 2apart

    2apart Guest

    Do they make cheap signal modulated (verses turn with a wheel) dimmer
    switches.

    I want to control some display lights, 5 channels, about 300W per
    channel.

    Modulate with analog io board. (not an exotic pattern, maybe they even
    sell
    simple sequencing units with multiple channels .. I've seen slow
    switched
    xmas lights that do that)

    Thanks
     
  2. jasen

    jasen Guest

    they do make voltage controlled dimmers. (about 1-10V in I think.)
    dunno how cheap.

    A commercial lighting place may be able to help.

    Bye.
    Jasen
     
  3. Chris

    Chris Guest

    Hi, 2. Crydom makes a proportional control solid state relay, which
    accepts a 2-10VDC input and outputs phase control of AC (like a lamp
    dimmer). The appropriate part number is 10PCV2415, and it's available
    at Newark for about $87 USD each. That's the store-bought solution,
    and at over $430USD it sounds like it might be a little pricey for you.

    If you want something significantly cheaper, and you have "advanced"
    electronics assembly skills, I would recommended the Velleman K8064
    kit. It is rated for up to 375W control at 120VAC, and it's about $30
    each in unit quantities from their distributors. You can get more
    information about this kit from the Velleman website:

    http://www.vellemanusa.com/engine.php

    $150USD sound a little better? I don't think you're going to get much
    lower than that for 5 optoisolated AC controls.

    Good luck
    Chris
     
  4. default

    default Guest

    Roll your own - check out some "color organs" Thingees that take
    sound and modulate light - that should give you ideas how to do it.

    http://www.discovercircuits.com/C/color-org.htm

    or search google for:

    music light circuit schematic "color organ"

    Some solid state relays may work if you pulse width modulate the
    signal to the SSR.

    Another "roll your own" a SSR can be made with a "triac, LED, and CDS
    photocell" in a light proof enclosure. I used to do that in the 70's
    pre- commercially available SSRs.

    Take a container (like the little plastic thing dental floss comes in)
    put the parts in and pot in clear polyester resin or epoxy, paint with
    black spray paint. Could make them small enough to fit in switch
    boxes with lots of room to spare. With the right container and a spray
    of silicone oil the epoxy block pops out and the container can be
    reused to pot another one.

    My girlfriend at the time was a nurse who worked "on call" at the
    hospital and would have to go in at weird hours. I put a light
    detector at the end of the driveway. The headlight from her car would
    trigger a timer and send signals to light switches that would turn on
    the lights for a predetermined time so she could get to the house
    without stumbling over things - find the lock and go into a lit house.
     
  5. Here is one module:

    DC CONTROLLED DIMMER
    http://www.velleman.be/ot/en/product/view/?id=354314

    It takes DC control voltage in and dimmes light.

    I have used the previous revision of that module on
    some light ptojects. Worked well.

    Other option is to check the prices of cheap "DJ quality"
    multi channel dimmer packs. Those can be foudn nowadays
    at quite cheap price. Those are normally controlled
    either with 0-10V DC control voltage or DMX-512 digital
    bus.

    DMX-512 might be worth to check tecnology.
    You just need a suitable adapter for your PC and run
    suitable ligth control software to do whatever you need.
    No I/O card needed. Links to DMX-512 information can be
    found here:
    http://www.epanorama.net/links/lights.html#dmx512
     
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