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'[EE]: Micrphone Noise Detection'
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For TTL input you need at list 3 volts to make it logic 1. In my project I
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
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.
Attachment converted: creation:noise.PDF (PDF /CARO) (00016028)
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