Hello,

    I initiated a thread some time ago about how can I make a musical
instrument tuner (guitar tuner) with a PIC. We have some ideas, but no
conclusion.

    Sometime before it, Albert Goodwill started a thread called "PIC based
frequency measurement for musical tunes".

    Well, anyone wants to talk about it again?

    I'm still trying to build it. The biggest problem is that with a
non-regular wave (lot's of harmonics), it's hard to have a meaningfull
frequency measurement. My idea is to have a variable PIC-controlled low-pass
filter (MAX291/MAX295) to filter the harmonics and have an almost perfect
sine-wave so I can make the frequency measurement.

    I think it will work, but I can't measure above 2KHz with a MAX291 (max
PWM output on PIC16F87X at 20MHz is 200KHz) and it will not be automatic.

    Ideas, please?!?!?!

    Best regards,

    Brusque

-----------------------------------
Edson Brusque
Research and Development
C.I.Tronics Lighting Designers Ltda
(47) 323-2685  /  (47) 9993-6453
Blumenau  -  SC  -  Brazil
-----------------------------------

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