[sdiy] Substitute for pin matrixes?

[David G. Dixon]

Here's an off-the-wall and probably totally impractical suggestion:  What
about a "binary switch matrix" which only exists as strings of 1- or 2-byte
binary numbers?  For example, 1 is an "on" and 0 is an "off", so, say,
01101101 represents a row of 8 switches in various positions.  However, this
number can be represented by a two-digit hexadecimal code (in this case, 6D,
if I'm not mistaken).  This number could be entered into a hexadecimal
keypad, and the rest is done with analog switches and a bit of digital
circuitry.  An 8x8 matrix would require 8 2-digit hex numbers.  This would
be a very compact way to create and store patches!  They could be stored in
a very small RAM.  You could even morph or randomize the patches by applying
various algorithms to the hex numbers.

That's my random thought for the day.


> Subject: [sdiy] Substitute for pin matrixes?
> 
> Any ideas around something that could be a reasonable substitute for
> matrixes? It need to be quite small, small physical space, dead cheap
> and widely easily acquired and have reasonable life time!
> 
> Guillemette matrixes cost a fortune are very small fiddly and has
> a certain level of crosstalk, pins are far from cheap etc, looks nice..
> 
> Regular things people use to come up with are arrays of 3.5mm tele or
> 2,5mm
> tele or 4mm bananas. But these are not dead cheap and quickly eats space.
> 
> Thats why i earlier asked about life of turned sockets!
> Matrix Array made of IC rims!
> 
> My next idea was about IDC connectors and gold plated pin lists!
> Low cost Cramp terminals sell sin bags of 100-250 can be had for
> 10-20 Euro, pin list's cost slightly more but it's dead cheap.
> One takes a wire solder whatever ohm one want to use, crimp tube
> over it, however  pins may stay alive quite long but the crimp
> terminal will most likely not?
> 
> Then i thought about Merklin miniature railway sockets?
> Kind of sub miniature bananas. 2mm the usual suspects sell these
> but they are far from dead cheap at least cheaper then 4mm standard
> bananas.
> 
> I then tooled around using PCB SMB connectors, but are
> there any cheap snapin SMB around? I haven't found any!
> 
> Sub Sub miniature SPDT switches are nice, however cost a fortune!
> 
> Anything electronic needs plenty of cmos muxes and latches and registers
> to hold the shit and quickly eats up space, there are complete matrixes
> in silicon but these are often HF /Video and are expensive.
> 
> Then i got this idea, latching hall sensor that latches a Cmos switch!
> Are there any latching Hall sensors? i.e toggle state whenever magnetic
> field comes close? One could glue a tiny magnet to a match used to point
> at switches!
> 
> Are there any other obscure pins, tubes, anything that could be
> used to construct a inter connection?
> 
> Reg
> KD
> 
> 
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