[sdiy] Mod wheel/other stuff. meant for list

[Jaco Sloof]

I think this is also meant to be on the list


--- ethan tripp <ethan at monsoonmicro.com> wrote:
> Date: Wed, 10 Sep 2003 10:24:10 -0400
> Subject: Re: [sdiy] Mod wheel/other stuff.
> From: ethan tripp <ethan at monsoonmicro.com>
> To: Jaco Sloof <jacosloof at yahoo.com>
> 
> interesting ideas. i was thinking of it yesterday for a while. i could  
> certainly rig it. lord knows i do a lot of rigging. but i was actually  
> looking for replacement pitch wheels (thank you). btw, what does the  
> mod wheel do? remember, i'm new to this, i don't own a synth, and have  
> never worked on one. hopefully we'll change all of that.

>From what i know, a Mod wheel changes various things:
I have for instance a synth that allows the mod wheel to be set for
cutoff,Attack,Decay, Tremolo, Vibrato,Aftertouch Sensitivity, Scaling, et
others

> so anyway, i did find a site that said it had a replacement for 7 usd.  
> no pix though, and i don't like buying things sight unseen. i was just  
> wondering b/c there is a popular bend you can do on casios (and just

Reed Ghazala's site on bending?

i think the url is: http://www.oddmusic.com/illogic

but i'm sure a google on circuitbending would turn up some more usefull sites.

> about anything else, to get a good pitch up/pitch down. people who i've  
> been talking to about modifying things have been asking about pitch  
> wheels that return to true pitch position automatically. so i thought  
> i'd ask.
> 

it never hurts to ask!

> other stuff:
> i have noticed in a lot of toy's that i've bent, that certain  
> connections on the board produce non sample based tones. meaning they  
> squeal like a pig if you touch them (naughty) in the right place. if  
> you connect the bend to a pot, you can get a huge range.
> my question is, is it a sort of accidental tone producing circuit that  
> can be reproduced? we talk a lot about oscillators and tubes and

maybe you're coupling the clock generating circuits to the tone producing ones

Will samples be played at altered pitch too when using this bend?

> whatnot, but this thing is making tones with just resistors and caps  
> etc. can this be replicated? anyone know of any simple sound generating  
> circuits?

or indeed it could be an RC oscillator

> by simple, i mean 12 or so parts, and no chips.
> 
> other other stuff:
> i'm looking to build a vco. my first. cost, unfortunately is an issue.
> so, what do you guys think of this?  
> http://www.ele4music.com/vco4d/vco4d.html
> or are there any other inexpensive solutions that you guys have built  
> or can recommend. bear (is that right?) in mind that i've never done  
> this before. i'd really like to start a box o' modules. something i can  
> work on over time, adding modules as i can afford them.
> 
> thanks,
> -et-
> 
> 
> On Wednesday, September 10, 2003, at 05:35 AM, Jaco Sloof wrote:
> 
> > How about the playstation Analog Joysticks?
> >
> > Then you've got two of them!
> >
> > actually, it wouldnt be so hard (for you guys ofcourse)
> > to fix up an interface that allows usage of the joystick
> > as a whole (including buttons and all)
> >
> > just rambling...
> >
> > Greets, Jaco Sloof
> >
> > --- Gene Stopp <gene at ixiacom.com> wrote:
> >> Things that can be cannibalized to provide return-to-center  
> >> potentiometers:
> >>
> >> * Cheap radio control transmitters for cars (steering wheel thing)
> >>
> >> * Old pool motor timers (steal the mechanical bits and add a pot)
> >>
> >> * Scrapped OB-X's and DX-7's (but we already knew that one)
> >>
> >> Take a look at the insides of any of the above and you can see how  
> >> they do
> >> it. One thing I like to do is take possession of reel-to-reel tape  
> >> decks
> >> that are hopeless (i.e. heads too worn, bent/broken turntables, etc.)  
> >> and
> >> scavenge them for springs and linkage bits. I've built a few  
> >> spring-loaded
> >> pots this way.
> >>
> >> - Gene
> >>
> >>
> >> -----Original Message-----
> >> From: Tim Parkhurst [mailto:tparkhurst at siliconbandwidth.com]
> >> Sent: Tuesday, September 09, 2003 2:04 PM
> >> To: 'ethan tripp'; SDIY
> >> Subject: RE: [sdiy] Mod wheel
> >>
> >>
> >> Hey Ethan,
> >>
> >> From what I've seen, the potentiometer itself is not spring loaded.  
> >> The
> >> wheel has springs that mount between the body of the wheel and part  
> >> of the
> >> chassis to pull the wheel back to center. I'm assuming you're actually
> >> talking about a pitch bend wheel rather than a mod wheel. I have seen
> >> joysticks that have springs built in to return to center, but again,  
> >> those
> >> springs are in the body of the stick rather than in the pot itself.
> >>
> >> Also, the usual trick to get a small center 'dead band' in the pitch  
> >> bend
> >> pot is to put a couple of diodes in series with the pot. The 0.6V drop
> >> across the diode means that the voltage coming off the pot doesn't  
> >> change
> >> until it swings higher than 0.6V or lower than -0.6V.
> >>
> >>
> >> Tim Servo
> >>
> >> "Imagination is more important than knowledge." - Albert Einstein
> >>
> >>
> >>
> >>
> >>> -----Original Message-----
> >>> From: ethan tripp [mailto:ethan at monsoonmicro.com]
> >>> Sent: Tuesday, September 09, 2003 12:55 PM
> >>> To: synth-diy at dropmix.xs4all.nl
> >>> Subject: [sdiy] Mod wheel
> >>>
> >>> does anyone know where i could get a mod wheel potentiometer.
> >>> the spring loaded type that rest at center (true pitch) and swing up
> >>> and down?
> >>>
> >>> -et-
> >>
> >>
> >>
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