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

[Kyle Stephens]

Ug, it was my misremembering here. I had an idea of 8 individual electronic SPST switches, each turned on by a third input pulse. They're actually ganged together in various ways (via the control inputs), depending on the model (4051,52, 53).

http://www.fairchildsemi.com/ds/CD%2FCD4052BC.pdf


_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, 4:00 PM
> 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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> >> >>
> >> >
> >> >
> >> >
> >> >
> >> >
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