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

[cheater cheater]

actually no, I think it's a 1 to 8 or 8 to 1 mux. My bad. So you take
8 of those and have an 8x8 matrix. Does anyone smarter with that stuff
want to clarify how a 4051 REALLY works? :)

D.

On Sun, Jan 24, 2010 at 23:41, Kyle Stephens <lightburnx at yahoo.com> wrote:
> 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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