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This Guitar Tuner and Preamp project built by Rob uses a PIC microcontroller and an old stereo to allow visual tuning of a guitar. LEDs indicate how well tuned each string is. I started by extricating the entire CD changer mechanism, including the spindle drive and laser unit, and the board with the DAC circuits. It was a simple matter to find where the audio inputs on the main board where that the CD audio signal was fed into. I would use these to feed the guitar signal into the stereo amplifiers (so I can still use the tuner and tape decks normally. When I want the guitar on, I just select “CD” for the input source) The guitar’s input is buffered by an Analog Devices AD620 instrumentation amplifier. This chip is definitely overkill for this application ( I think each 8 pin DIP retails for $12) but I happened to have a few lying around my bench so what the hell. It has a great CMRR and an external output reference which can be used to virtually eliminate ground loops and hum. ”
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March 17th, 2007
Now why haven’t more guitar amplifier makers put tuners into the amp?
This seems like a brilliant idea!
March 17th, 2007
I just wonder why they used so much perf board for so few components
March 17th, 2007
this is a really cool Idea, I dont even play the guitar But I think this is awesome.
March 17th, 2007
uhm, Your stereo probably has an ‘aux in’ (auxiliary in) jack which you could have plugged into without ripping out the cd thing.
March 18th, 2007
[…] guitar tuner, instrumentation amplifier, pic microcontroller Posted March 17th 2007 Permalink | Email this | Comments(0) […]
April 10th, 2007
My little brother is a huge guitar freak, I think I may have to make him once of these for a b-day present or something along those lines.
February 10th, 2008
please send me details about pic16f73 , pic 16877a microcontroller
February 10th, 2008
Hi Vinoth,
Please go here for chip details
http://microchip.com