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'[EE]: Micrphone Noise Detection'
2000\06\01@163921 by Andre Abelian

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For TTL input you  need at list 3 volts to make it logic 1. In my project I
started with
picmaster every thing was fine when I tried real part it didn't work
later I found that picmaster is uses FET parts logic 1 is 1,5 volt. any way
I just
drew a schematic that it should work for you. you may need to amplify more
to get what you need
all deepens how high is your noise level. If you are using CMOS level input
then all you
need is 1,5 volts.

Andre Abelian




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