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

[Kyle Stephens]

D,

No, you got it. It was my bad thinking only in a one-for-one sense, though the idea could be applied to some interesting modulation routing - say 4 sound sources, 4 modulators, hopping between each other. Call it a stepped scanner.


_Kyle

--- On Sun, 1/24/10, cheater cheater <cheater00 at gmail.com> wrote:

> From: cheater cheater <cheater00 at gmail.com>
> Subject: Re: [sdiy] Substitute for pin matrixes? Probability list update 2.
> To: "Kyle Stephens" <lightburnx at yahoo.com>
> Cc: synth-diy at dropmix.xs4all.nl
> Date: Sunday, January 24, 2010, 1:48 PM
> Kyle,
> a 4051 is an 8 channel multiplexer which means it can can
> only make 4
> connections (with 8 ends) - correct me if I'm wrong?
> 
> Thanks
> D.
> 
> On Sun, Jan 24, 2010 at 21:54, Kyle Stephens <lightburnx at yahoo.com>
> wrote:
> > 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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