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corner cv's with a joystick
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ambi-J



Joined: Apr 12, 2007
Posts: 17
Location: belgium

PostPosted: Sun Mar 09, 2008 12:03 pm    Post subject: corner cv's with a joystick Reply with quote  Mark this post and the followings unread

normally the use of a joystick in an analog synth is restricted to 2 cv's: a pot for the horizontal and a pot for the vertical axis.
here is an 'analog' calculator with opamps witch calculates the 4corner cv's of it.
each axis has to work between the same positive and negative voltages, with 0 volt in the middle of the joystick.
with a set of opamp inverters and summers we can now calculate the corner cv's.
where is it good for? : driving 4 vca's you can use it as a morphing controller or for quadrophonic effects.

I have implemented it on my 'muze' modular an started to draw a pcb for it.
If there are enough people interested, I will finish the pcb drawing an publish it (eventually sell pcb's)


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ambi-J



Joined: Apr 12, 2007
Posts: 17
Location: belgium

PostPosted: Sun Mar 09, 2008 12:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

the schematic is in dutch: sorry for that.
translations:
LB: left up
RB: right up
LO: left down
RO: right down
optelschakeling: summer

on the left of the drawing you will see two pots between + and -: it's a stereo pot witch give the range.
the H and the V pots are actually the joystick.
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neandrewthal



Joined: May 11, 2007
Posts: 672
Location: Canada

PostPosted: Fri Mar 14, 2008 11:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Very cool. I'm definitely interested.
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Danno Gee Ray



Joined: Sep 25, 2005
Posts: 1343
Location: Telford, PA USA

PostPosted: Fri Mar 14, 2008 2:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm interested.
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6079smith



Joined: Jan 18, 2007
Posts: 95
Location: Mark of the Dane
Audio files: 4

PostPosted: Sat Mar 15, 2008 3:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, pretty cool idea. I finished (what I thought was) a fairly comprehensive joystick controller recently; now I've got a whole lot of other things to think about... nice one.
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macumbista



Joined: Sep 12, 2007
Posts: 364
Location: berlin
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PostPosted: Sun Jun 21, 2009 1:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Also interested. Ditto + bump! Wink
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macumbista



Joined: Sep 12, 2007
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Location: berlin
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PostPosted: Sun Jun 21, 2009 1:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm assuming all the resistors in the inverters or summers are equal, and matched to the values of the joysticks, right?
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kenl666



Joined: May 12, 2004
Posts: 66
Location: Pacific Northwest

PostPosted: Tue Jun 23, 2009 2:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

I also would be interested in a PCB or two!
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