[sdiy] audio controlled light show

[KA4HJH]

>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.

I built a voltage-controlled for an abstract light sculpture using
optoisolators and triacs. Ridiculously simple once you figure it out.

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

Since there was no audio involved I don't know how much EMI the thing gave
off but I'm sure it was there. Actually, the microcontroller running the
whole thing gave off a lot of RFI by itself.

-- 

Terry Bowman, KA4HJH
"The Mac Doctor"