[sdiy] Substitute for pin matrixes? Probability list update 2.

[Kyle Stephens]

Hm, having had some lunch and time to think, I realize my idea here only works with one connection per axis. Well, back to square one :|


_Kyle

--- On Sun, 1/24/10, Kyle Stephens <lightburnx at yahoo.com> wrote:

> From: Kyle Stephens <lightburnx at yahoo.com>
> Subject: Re: [sdiy] Substitute for pin matrixes? Probability list update 2.
> To: synth-diy at dropmix.xs4all.nl
> Cc: "karl dalen" <dalenkarl at yahoo.se>
> Date: Sunday, January 24, 2010, 12:54 PM
> Here's a solution with only two pots
> for an 8x8 matrix:
> 
> An X pot, and a Y pot, both wired as voltage dividers, each
> running into an 8-bit ADC. Each bit address intersects with
> an AND gate (quad AND, need 4 - and one input is for the
> X-axis, the other the Y-axis), the output of which turns on
> 1/8 of a 4051 (2x of those for 16 connections), with one
> switch 'pole' connected to a point on one axis, and the
> other pole to its respective spot on the other axis. If you
> need some visual indicator, a decoder and numerical LED
> array will get you there (more simply, if taking more space,
> two rows of LEDs tapped off of each address lines works
> too).
> 
> If you need more than 8x8 connections, you can just cascade
> an ADC with a binary weighted out and op amps, needing much,
> much less than 8 bits per 'bank' (vis-a-vis a VCDO),
> depending on how many connections we're talking here. (might
> want a coarse/fine pot setup at that point).
> 
> (8x8)^2 = 4096 possibilities (that's a Hans Zimmer-class
> synth!).
> More reasonably, say (2x8)^2 = 256.
> 
> At its simplest as said, it's just two pots - if available
> real estate is an issue, this takes care of that.
> 
> You could even make the patching voltage controlled,
> putting CVs into the ADCs, ooh...just a thought.
> 
> The off-the-top-of-my-head-estimated bill for this would
> be, with surplus parts and let's say $0.50/most ICs...
> 
> 2x pot = $3
> 2x ADC = $7
> 4x AND = $2
> 2x 4051 = $1
> 2x decoder = $2 (optional)
> 2x LED array = $6 (optional)
> 
> $15-23. Cheap?
> 
> 
> _Kyle
> 
> --- On Sun, 1/24/10, karl dalen <dalenkarl at yahoo.se>
> wrote:
> 
> > From: karl dalen <dalenkarl at yahoo.se>
> > Subject: Re: [sdiy] Substitute for pin matrixes?
> Probability list update 2.
> > To: synth-diy at dropmix.xs4all.nl
> > Date: Sunday, January 24, 2010, 9:20 AM
> > Turning stones for something
> > cheaper(dead cheap)then a Gillimetti matrix:
> > 
> > 1: Aligator clips on wire mesh as array.
> > 2: Sub miniature SPDT arrays.
> > 3: Toy railway/mechano sub sub bananas arrays.
> > 4: 2.5mm tele arrays.
> > 5: 3.5mm tele arrays.
> > 6: 4mm bananas arrays.
> > 7: Upside down IDC array resistor or wire as cross
> > connects.
> > 8. Turned IC holders arrays.
> > 9:  Pin lists arrays.
> > 10: Miniature push button arrays.
> > 11: Veroboard layers as arrays, with bridge shorting
> > between.
> > 12: MT8816 and others, 4066, serial latches, MCU etc.
> > 13: Latching Hall sensor arrays, controlling muxes.
> > 14: Relay arrays, klicketi klack sound on its own.
> > 15: Buchla paper solder punch card holders pluggable
> > something.
> > 16: A gigantic array of pots.
> > 17: Fuse holder array.
> > 18: Automatic fuse array.
> > 19: Rims of plastic Lab plates arranged in arrays.
> > 20: Standing sub miniature USB connectors, can carry
> 4
> > signals each.
> > 19: Replace the analog shit with digital DSP shit for
> plain
> > convenience?
> > 20: LDR Matrix with card with holes blocking a light
> > source.
> > 21: Spark gap and other high voltage switches, watch
> out
> > for your safety.
> > 
> > At the moment im out of ideas so i just post a
> updated
> > probability
> > list as a reference for folks to know what has been
> > discussed so far!
> > Not saying you shouldn't evolve over it again, perhaps
> you
> > find
> > something this time you didn't find the first?
> > 
> > KD
> > 
> > 
> >      
> >
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> 
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