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Noise free dimmer switch???

Discussion in 'General Electronics' started by Ron H, Nov 11, 2004.

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  1. Ron H

    Ron H Guest

    Does anyone make a trully noise free dimmer switch?

    Ron H.






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  2. M Nelson

    M Nelson Guest

    Yes. Either a old-fashioned rheostat or a Variac are pretty well noiseless
    in operation. Does take a lot of wall space, though.
     
  3. Don Taylor

    Don Taylor Guest

    Variac (tm) ?
     
  4. You're right. I never thought about it before so I looked it up
    http://www.martinos.org/~reese/VariacPage/

    Its one of those really good names. Kleenex, Jell-o, Q-tips, Scotch
    tape. Have you EVER heard ANYBODY ask for the Tuck tape? Useless
    tidbit. Videotape was a registered trademark of Ampex corp.

    gg
     
  5. N. Thornton

    N. Thornton Guest

    also dont forget mechanical shutters, useful for lights that wont
    restrike until they cool down.

    NT
     
  6. Jim Murphy

    Jim Murphy Guest

    Theatrical or architectural dimmers will do the tirck. We sell and install
    them. A little pricey for a home though. They are SCR controlled with a lot
    of control electronics including a digital control circuit. There are DJ
    versions that are not as expensive but you will have to make a heck of a
    hole in your wall if you want to install it in the Dining Room. We have a
    customer who has a whole farm of rheostats on the wall near the sound
    console. Talk about sizzle. We're pricing digital for them. Jim
     
  7. Robert Casey

    Robert Casey Guest

    A rectifier diode is reasonably quiet, but you
    get only one dim setting. You would have 3 choices:
    full on, half brightness, and off. If you have
    a pair of light bulbs both independently dimmed
    by diodes, and if one is 40W and the other 100W
    you could get 9 different brightness levels with
    the pair. Each bulb gets its own "off-half-full"
    switch, and with the pair that gives 9 possible
    light levels.
     
  8. I'm using Leviton and have no noise whatsoever and I'm a ham so am very
    conscious of the noisy devices sold today including the switch mode
    converters for low voltage halogen lamps.

    Ralph C
     
  9. N. Thornton

    N. Thornton Guest

    For most apps the best dimmer is a switchbank, one switch per light
    fitting, or with larger venues several per switch. Wont replace all
    dimmer apps but has considerable advantages where it is appropriate.

    NT
     
  10. Jim Thompson

    Jim Thompson Guest

    Stage dimmers use motorized big-ass inductors with a removable core...
    core all the way in, much inductance, much dimming; core out, no
    dimming.

    ...Jim Thompson
     
  11. Very low noise dimmers are made for theatres (the ones with live actors).
    Dimmer noise otherwise gets into the sound reinforcement system.

    Expensive - not like the $3.98 at Walmart kind:
    http://www.etdimming.com/

    A variac works very well in this application, and is the standard
    in small installations.
     
  12. sparky

    sparky Guest


    Use a saturable reactor. Virtually noise free.
     
  13. Uncle Peter

    Uncle Peter Guest

    Ditto here. The "quieter" brand name dimmers are marketed
    as such, look for something on the packaging to that effect.

    Pete
     
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