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Building a guitar tuner.. need some help!

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ans to ur question

when the string of the giutar is toughen up.. then sunsunidal waves increases as and when the frequency increases
 
Dunno, but it'd be based on a frequency to voltage chip(commonplace), going into an ADC(analogue to digital converter) , then the digital output would go into a 'binary word- to - musical note' encoder (you'll need to make that yourself) , going into 7-segment display driver for the output.
 
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