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phonic intermittance

i am having problems building a device to interupt a high voltage flow
of electricity.
i initialy tried to use an optocoupler, which i hoped would respond to
an audio current as input - interupting the high voltage flow as the
frequency of the audio current increeses and dwindles.

however the optocoupler did not respond with any variation. it was
simply on/of in responce to a complete cercuit on the input -
regrdless of any current in the input cercuit.

alternatively i am looking at this sound operted switch
http://www.saburchill.com/tech/electronics/elect028.html

but can not understand which components i should buy.

basicaly what i want to do is have sound (as electricity) produce
quantitive variation in light (rather than sound).

many thnks for any help anyone could give.

benjamin.
 
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