Motor for Guitar Tuner

Discussion in 'The Projects Forum' started by The_Fleertz, Oct 17, 2012.

  1. The_Fleertz

    Thread Starter New Member

    Apr 23, 2012
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    0
    Hey all,
    I need a DC servo for an automatic guitar tuner and was wondering if anyone had suggestions for one that would have sufficient torque and be easily controlled using a PIC16f887 and an H-bridge. No RC servos though.
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    What does a servo motor got to do with a guitar tuner?
    Are you attempting to tune the guitar strings with a motor?
    I think the required torque is going to be extremely high.
     
  3. wayneh

    Expert

    Sep 9, 2010
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    Not with the mechanical advantage of the tuner mechanism. My old fingers have no problem.

    Also, I had my guitar in the shop recently and saw the technician use a motorized winder to speed up a restringing. He just slipped it over the the tuning knob and spun it like using a cordless screwdriver.
     
  4. MrChips

    Moderator

    Oct 2, 2009
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    Winding up the string is one thing, tuning to a precise musical note is another.
    I am a musician and guitar player. I know what it takes to tune a guitar.
     
  5. wayneh

    Expert

    Sep 9, 2010
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    Oh I'm not saying it's a simple idea to implement, just that it could be done. The tuning process takes a skilled hand, but I think a computer could do it as well as a human. A device that matched your guitar and could tune all 6 strings at the same time would be pretty cool. I'm sure I'd never pay for one, but I'd want one.
     
  6. MrChips

    Moderator

    Oct 2, 2009
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    A better idea would not require a perfectly tuned guitar. Play a note and a DSP plays back a perfectly tuned note, chord, chorus or whatever for any instrument of your choosing. Like a keyboard synthesizer.
     
    Last edited: Oct 17, 2012
  7. Sensacell

    Well-Known Member

    Jun 19, 2012
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    You just need a small DC motor with a large reduction ratio gearbox, super low speed, high torque.

    Backlash is always an issue, but that's another story.
     
  8. GetDeviceInfo

    Senior Member

    Jun 7, 2009
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    tuning and winding would be substantially different operations. I have a handy electronic device with three lights. I select the note and tune to the lights. Can't imagine a motor improving that simplicity. Winding maybe, but I usually don't put on more than 4 winds as an anchor. For continous fine tuning, a thermal 'motor' might be considered. Someone suggested passing current through the string to create a thermal response.

    As I see it, speed for winding is a contradiction to precision for resonance.
     
  9. wayneh

    Expert

    Sep 9, 2010
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    I can only speculate that the OP wants to automate the process, to take the "I" out of it. A minimum-wage roadie could then produce a perfectly tuned guitar without knowing jack about it.

    Hah, yes I've "enjoyed" current passing through my microphone to my lips. Certainly changed my tune!
     
  10. GetDeviceInfo

    Senior Member

    Jun 7, 2009
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    silly suggestions, I'll hold my tongue (keystrokes) next topic.
     
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