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KermMartian


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Joined: 14 Mar 2005
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Posted: 10 May 2009 07:45:08 pm    Post subject: Multichord Musical Instrument



After a few months of tossing this idea around in my head I recently constructed the Multichord, a single-stringed musical instrument that uses a hard drive to vary the tension in the string. It can play a full octave of notes by applying specific tensions related to the voltage applied to the hard drive's read-write head, as produced by an array of power resistors. A musician sets the note with pairs of buttons on the end of the instruments, then plucks the string to make the note.

I have detailed the project with photos, a video, and plans and schematics below. Check out the video below and click through to the Project Page for all of the information.

Multichord Project Page


Click on any of the thumbnails below for the full-sized image
Multichord and power supply Multichord front view Multichord resistor networks Note selection buttons


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Last edited by KermMartian on 12 May 2009 03:31:32 pm; edited 1 time in total
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elfprince13


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Posted: 10 May 2009 07:53:07 pm    Post subject:

that's pretty cool! You should release some schematics. How quickly can it change the note?
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KermMartian


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Joined: 14 Mar 2005
Posts: 55736
Location: Earth, Sol, Milky Way

Posted: 10 May 2009 08:10:44 pm    Post subject:

elfprince13 wrote:
that's pretty cool! You should release some schematics. How quickly can it change the note?
If you click through to the Project Page you will see the schematics and plans. Smile It can change the note in about a quarter of a second or less, as shown in the video.
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Ultimate Dev'r


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Joined: 16 Mar 2005
Posts: 7297

Posted: 10 May 2009 08:14:21 pm    Post subject:

I must admit, that was pretty gay. Needs moar distortion.

BTW is that C4 attached on the side?
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KermMartian


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Posted: 10 May 2009 09:32:25 pm    Post subject:

Ultimate Dev'r wrote:
I must admit, that was pretty gay. Needs moar distortion.

BTW is that C4 attached on the side?
Erm no, those are the 20W power resistors. They're good for high-current or higher-voltage applications like this,
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Ultimate Dev'r


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Posted: 10 May 2009 09:45:52 pm    Post subject:

KermMartian wrote:
Ultimate Dev'r wrote:
I must admit, that was pretty gay. Needs moar distortion.

BTW is that C4 attached on the side?
Erm no, those are the 20W power resistors. They're good for high-current or higher-voltage applications like this,


You sure? Because the resemblence is uncanny:
http://www.cemetech.net/img/projects/ee/multichord/CIMG2904.JPG
http://img234.imageshack.us/img234/4639/usdetonatorc46ee.jpg
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KermMartian


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Joined: 14 Mar 2005
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Location: Earth, Sol, Milky Way

Posted: 10 May 2009 10:39:54 pm    Post subject:

Ultimate Dev'r wrote:
KermMartian wrote:
Ultimate Dev'r wrote:
I must admit, that was pretty gay. Needs moar distortion.

BTW is that C4 attached on the side?
Erm no, those are the 20W power resistors. They're good for high-current or higher-voltage applications like this,


You sure? Because the resemblence is uncanny:
http://www.cemetech.net/img/projects/ee/multichord/CIMG2904.JPG
http://img234.imageshack.us/img234/4639/usdetonatorc46ee.jpg
Quite sure, because if they were not power resistors, then I would be quite dead right now. Thanks though.
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Super Speler


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Joined: 12 Dec 2006
Posts: 248

Posted: 10 May 2009 11:07:46 pm    Post subject:

Is Multichord supposed to be ironic?
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KermMartian


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Posts: 55736
Location: Earth, Sol, Milky Way

Posted: 10 May 2009 11:39:19 pm    Post subject:

Super Speler wrote:
Is Multichord supposed to be ironic?
Not exactly. the original, non-electronic version was called the Monochord, even though technically the correct word is Monotone, so my version with the electronic tuning is called Multichord instead of Multitone.
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foamy3


Official Cemetech Fuel Transfer Engineer

Joined: 14 Dec 2005
Posts: 2190
Location: PA

Posted: 12 May 2009 03:30:19 pm    Post subject:

Your project page link gives a 404 (both here and on the frontpage).

And yeah, that is an extremely misleading name. You'd need 3 of them sitting next to each other to play a chord. :p
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KermMartian


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Posted: 12 May 2009 03:36:51 pm    Post subject:

foamy3 wrote:
Your project page link gives a 404 (both here and on the frontpage).

And yeah, that is an extremely misleading name. You'd need 3 of them sitting next to each other to play a chord. :p
Fixed. Whoa, I can't believe no one called me on the 404. I agree that it's misleading, but surely my justification is logical...?
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Eeems


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Joined: 22 Jan 2009
Posts: 832
Location: Edmonton, Alberta

Posted: 12 May 2009 03:53:53 pm    Post subject:

I didn't get a 404 when I clicked it yesterday.
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elfprince13


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Posted: 13 May 2009 10:03:08 am    Post subject:

Kerm, to correct the name, all you really have to do is tack a paper plate to the center of the instrument (below the wire), but about 1/4 of the way out from the center of the plate. Then rotate the plate as desired. multichord ftw
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KermMartian


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Joined: 14 Mar 2005
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Posted: 13 May 2009 11:21:08 am    Post subject:

elfprince13 wrote:
Kerm, to correct the name, all you really have to do is tack a paper plate to the center of the instrument (below the wire), but about 1/4 of the way out from the center of the plate. Then rotate the plate as desired. multichord ftw
*facepalm* OK, you have a bit of a point there, but the pun is killing me. Sad
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foamy3


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Posted: 13 May 2009 11:48:03 am    Post subject:

This reminds me of the Gibson Robot Guitars.

http://www.gibson.com/robotguitar/index.html
You select a tuning, then strum it once, and all of the strings get tuned. And there are multiple strings, so you can play chords. Smile
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KermMartian


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Joined: 14 Mar 2005
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Posted: 13 May 2009 11:52:24 am    Post subject:

foamy3 wrote:
This reminds me of the Gibson Robot Guitars.

http://www.gibson.com/robotguitar/index.html
You select a tuning, then strum it once, and all of the strings get tuned. And there are multiple strings, so you can play chords. Smile
Wow, and a complete bargain at only #3600! I should get one for all my friends.
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Super Speler


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Joined: 12 Dec 2006
Posts: 248

Posted: 13 May 2009 12:05:36 pm    Post subject:

KermMartian wrote:
foamy3 wrote:
This reminds me of the Gibson Robot Guitars.

http://www.gibson.com/robotguitar/index.html
You select a tuning, then strum it once, and all of the strings get tuned. And there are multiple strings, so you can play chords. Smile
Wow, and a complete bargain at only #3600! I should get one for all my friends.

You totally should.
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Ultimate Dev'r


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Joined: 16 Mar 2005
Posts: 7297

Posted: 13 May 2009 12:56:02 pm    Post subject:

foamy3 wrote:
This reminds me of the Gibson Robot Guitars.

http://www.gibson.com/robotguitar/index.html
You select a tuning, then strum it once, and all of the strings get tuned. And there are multiple strings, so you can play chords. Smile


I remember hearing the announcement when it was released thinking "why would you spend $3600 just to have an auto-tuner?"
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foamy3


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Joined: 14 Dec 2005
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Location: PA

Posted: 13 May 2009 08:41:47 pm    Post subject:

Ultimate Dev'r wrote:
foamy3 wrote:
This reminds me of the Gibson Robot Guitars.

http://www.gibson.com/robotguitar/index.html
You select a tuning, then strum it once, and all of the strings get tuned. And there are multiple strings, so you can play chords. Smile


I remember hearing the announcement when it was released thinking "why would you spend $3600 just to have an auto-tuner?"


Why would anyone buy a Gibson to begin with? I've played Gibson's before and I really didn't think it was significantly better than my Epiphone. And my roommate has the Epiphone version of a Hummingbird with one of the fullest sounds I've ever heard out of an acoustic. I've never heard a bad Gibson, but they certainly don't stand apart enough to warrant a $2000 axe.
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Ultimate Dev'r


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Posted: 13 May 2009 08:54:43 pm    Post subject:

foamy3 wrote:
Ultimate Dev'r wrote:
foamy3 wrote:
This reminds me of the Gibson Robot Guitars.

http://www.gibson.com/robotguitar/index.html
You select a tuning, then strum it once, and all of the strings get tuned. And there are multiple strings, so you can play chords. Smile


I remember hearing the announcement when it was released thinking "why would you spend $3600 just to have an auto-tuner?"


Why would anyone buy a Gibson to begin with? I've played Gibson's before and I really didn't think it was significantly better than my Epiphone. And my roommate has the Epiphone version of a Hummingbird with one of the fullest sounds I've ever heard out of an acoustic. I've never heard a bad Gibson, but they certainly don't stand apart enough to warrant a $2000 axe.


Because they have more hand detailing than Epiphone guitars.
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