Sound sensor - based on ZX-Sound

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hi!
i made sound sensor based on zx-sound inex.
i dont know put here is..

http://www.youtube.com/watch?v=vyeb6oiebtw

awesome project! looking similar detect whether or not hairdryer on or off. think design or zxsound inex able achieve this? why did decide modify original schematic , not use board? thanks!


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