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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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 Posted: Fri Sep 17, 2010 3:00 pm Post subject:
Guitar pickup Pitch changer
Subject description: I am looking to build a simple circuit that changes the pitch |
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Hey guys I want to figure out a way to change the pitch of my guitar, so in effect tuning it with out tuning the pegs. Any ideas?  |
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D.Miñoza
Stream Operator
Joined: Jun 15, 2009
Posts: 376
Location: CowTown, USA
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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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| Posted: Fri Sep 17, 2010 5:57 pm Post subject:
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| I am attempting to make a synth with pickups, and I want to tune 10 pickups or more, so the price on a whammy pedal x10 would not really be in my range. I am hoping I can tune it with pots and some simple circuit for each step. |
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D.Miñoza
Stream Operator
Joined: Jun 15, 2009
Posts: 376
Location: CowTown, USA
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Posted: Fri Sep 17, 2010 6:37 pm Post subject:
Re: Guitar pickup Pitch changer
Subject description: I am looking to build a simple circuit that changes the pitch |
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| Synthrotek wrote: | | I want to figure out a way to change the pitch of my guitar, so in effect tuning it with out tuning the pegs. Any ideas? |
okey-dokey 
| Synthrotek wrote: | | I am attempting to make a synth with pickups, and I want to tune 10 pickups or more, so the price on a whammy pedal x10 would not really be in my range. I am hoping I can tune it with pots and some simple circuit for each step. |
btw- guitar pickups dont have a pitch..they dont generate sound at all so...
Am I misreading you again?
Good luck with your project.
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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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D.Miñoza
Stream Operator
Joined: Jun 15, 2009
Posts: 376
Location: CowTown, USA
Audio files: 31
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| Posted: Fri Sep 17, 2010 9:38 pm Post subject:
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| Synthrotek wrote: | | I will have some spinning metal to generate a frequency, but after that I want to alter the pitch... |
ok, so the guitar pickup can't alter the pitch of the metal.
in this case you could manipulate the spinning metal to alter pitch.
or a DSP like the one i suggested is an alternative.
here's something else: http://www.guitarpitchshifter.com/index.html
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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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| Posted: Sat Sep 18, 2010 7:07 am Post subject:
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| Well if it is not practical to alter the pitch after, what about before with a RLC circuit. Or a LC circuit. Will this grew be able to be picked up by a pickup? Any schematics on how to do this? |
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StephenGiles
Joined: Apr 17, 2006
Posts: 507
Location: England
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| Posted: Sat Sep 18, 2010 7:47 am Post subject:
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blue hell
Site Admin
Joined: Apr 03, 2004
Posts: 24652
Location: The Netherlands, Enschede
Audio files: 326
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| Posted: Sat Sep 18, 2010 7:53 am Post subject:
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| Synthrotek wrote: | | I am hoping I can tune it with pots and some simple circuit for each step. |
Nope, you can't .. physically impossible. Easiest way is to tune the strings ... or alter the rotation speed of the metal bits ... only other way is a pitch shifter. L(R)C circuits will not perform pitch shifts.
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also .. could someone please turn down the thermostat a bit.
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oldschool57
Joined: Nov 15, 2006
Posts: 17
Location: Bellerose, NY
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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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| Posted: Mon Sep 20, 2010 8:20 am Post subject:
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Ok, no offense - thanks for the great posts, but I am looking for a way to alter and tune the sound at the pickup level, not by having a post processor. Obviously Neon lights, CRTs, cell phones etc. affect the induction? and make noise on the pickup by disturbing the magnetic field. checkout:
http://www.freesound.org/samplesViewSingle.php?id=27789
I am looking for a circuit that can add "hum" if you will but something that I can tune and ultimately make a keyboard out of it.
Any ideas here. Thanks again! |
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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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| Posted: Mon Sep 20, 2010 4:57 pm Post subject:
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Ok, I think I have narrowed this down... I need a circuit that will give me variable hertz. 5-100 hertz I guess, hopefully with a pot to change the frequency. Needs to be ac I believe for the pickup to pick-up.
Ideas? |
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Taylor
Joined: Jul 13, 2006
Posts: 170
Location: us
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| Posted: Mon Sep 20, 2010 11:00 pm Post subject:
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| The pitch of something like this is defined by the speed of the motor. If you use a DC motor running on a 9v battery, you can change the speed by changing the voltage going to the motor. |
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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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| Posted: Tue Sep 21, 2010 1:25 am Post subject:
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| Taylor, thx but I don't want to use a motor. |
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Taylor
Joined: Jul 13, 2006
Posts: 170
Location: us
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| Posted: Tue Sep 21, 2010 1:39 am Post subject:
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Well then how do you plan to make this thing? Have you read up at all on how it actually works? |
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slacker
Joined: Nov 18, 2007
Posts: 301
Location: England
Audio files: 11
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| Posted: Tue Sep 21, 2010 4:28 am Post subject:
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Sounds like what he wants is a circuit that will spray out RF that the pickup can then dedect.
You can possibly just build a simple CMOS based oscillator, if you wave the pickup round that you should pick something up. I've done something similar just using a metal plate as a "pickup".
Have a look in the Lunetta forum here for examples. |
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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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| Posted: Tue Sep 21, 2010 9:14 am Post subject:
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| Slacker- thx. Do you have a schematic for any of the projects that you worked on? Also, I can't see that link, do you mind re posting that? Thx |
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slacker
Joined: Nov 18, 2007
Posts: 301
Location: England
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| Posted: Tue Sep 21, 2010 11:05 am Post subject:
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There wasn't a link I meant the Lunetta forum further up the page.
Here's a link to a simple oscillator http://www.electro-music.com/forum/topic-23878.html first post in that thread. All you need is the bits round round IC1A, where is says Osc1 is the output, if you just connect a length of wire to the output that will make a transmitter and holding your pickup near it will hopefully pick up the signal. |
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Taylor
Joined: Jul 13, 2006
Posts: 170
Location: us
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| Posted: Tue Sep 21, 2010 11:14 am Post subject:
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| slacker wrote: | Sounds like what he wants is a circuit that will spray out RF that the pickup can then dedect.
You can possibly just build a simple CMOS based oscillator, if you wave the pickup round that you should pick something up. I've done something similar just using a metal plate as a "pickup".
Have a look in the Lunetta forum here for examples. |
But he says above:
| Quote: | | I will have some spinning metal to generate a frequency, but after that I want to alter the pitch... |
So the pitch is created by how fast the metal spins, as in the video he posted, so in this case the pitch is, as I said above, determined by how fasts the metal spins, which is controlled by the motor. Am I crazy or missing a piece of the puzzle here? |
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slacker
Joined: Nov 18, 2007
Posts: 301
Location: England
Audio files: 11
G2 patch files: 1
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| Posted: Tue Sep 21, 2010 11:33 am Post subject:
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I don't know mate, maybe I've completely misunderstood, I was just going by what he wrote here.
| Synthrotek wrote: | Obviously Neon lights, CRTs, cell phones etc. affect the induction? and make noise on the pickup by disturbing the magnetic field.
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| Quote: |
I am looking for a circuit that can add "hum" if you will but something that I can tune and ultimately make a keyboard out of it.
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Which I took to mean he didn't actually want spinning bits of metal, just something that would generate noise a pickup could detect. |
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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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| Posted: Tue Sep 21, 2010 11:38 am Post subject:
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| Sorry for the miscommunication, I dont really want to use spinning metal |
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Taylor
Joined: Jul 13, 2006
Posts: 170
Location: us
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| Posted: Tue Sep 21, 2010 12:19 pm Post subject:
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Ah, well then I guess Slacker's got you covered.
So what function does the metal pickup serve when the sound generation is electronic? |
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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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| Posted: Tue Sep 21, 2010 1:54 pm Post subject:
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| I believe if it is an ac oscillation I should be able to pick it up with a pickup. I don't think a timer by itself will do it. |
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Synthrotek
Joined: Sep 04, 2010
Posts: 18
Location: Oregon
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ian-s
Joined: Apr 01, 2004
Posts: 2672
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 626
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| Posted: Tue Sep 21, 2010 6:43 pm Post subject:
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That circuit generates high voltage AC, I suggest you not build it.
Perhaps you could explain why you want to generate an electrical signal, then make that signal produce a signal in a pickup, which then produces an electrical signal at the output of the pickup.
The signal at the output of the pickup will just be a very low voltage copy (perhaps phase shifted) of your original signal. Do you imagine this will be useful somehow? |
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