[sdiy] audio controlled light show

[harry]

Most SSR ARE Triacs, or inverse / parallel SCRs... with a built in
optoisolated zerp voltage switching circuit.  They cannot be used for
dimming except by dropping cycles, which will flicker the lamps badly.

Real phase controlled dimmers need some SOLID EMI suppression
to make them sort of electrically benign...

H^) harry

Theo wrote:

> Most dimmer packs for theater use triacs to switch the lamps.
> Probably a lot cheaper than using (solid-state) relays.
>
> There was a circuit for a "theater" dimmer pack in Elektor a while back
> (sorry don't have the issue handy)
> For the intended theater use it was a bit on the flimsy side, only
> 500W/channel or so.
> But for a audio disco show this Elektor circuit might give you all
> inspiration you need ;)
>
> Maybe try a search for "dimmer pack circuits" or something like that.
> There are bound to be lots of examples on the web.
>
> Hope this helps,
> Theo
>
> From: Brett, Bill <BJB at dolby.com>
>
> > Greetings,
> > I am building a light controller that responds to an audio input. I have
> > figured out how I will do the audio signal to logic part of the circuit.
> > Question... how do I turn on/off the 120 AC for the lights. I thought of
> > using relays, but this will produce a slight lag between audio beat and
> > light pulse. Of course this lag will be added to the lag of the light
> > powering up. Maybe this lag is insignificant? Does anyone now of a
> schematic
> > that uses solid state to do this?
> > Thanks
> > -Bill
> >