crosspoint

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Temat: DIY audio patchbay with digital routing....How hard?
Not so hard:  in fact I'm vaguely working towards something similar. 1.  Choose an analog crosspoint matrix IC from Analog Devices.  Whichever one suits you for the number of ins, outs, etc.  2.  Read all the documentation on that chip. 3.  Design a control surface & display. 4.  Design a PCB layout. 3.  Write a MIOS app to spit the right digital signals into the chip and respond to the control surface/display. My impression is that the
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Temat: DIY audio patchbay with digital routing....How hard?
Well, maybe this makes the Mitel chips a bit more attractive? I know the 8816 is a little odd in that it is an 8x16 (rather than an 8x8), but at $4.50 US each, you could chain quite a few together in no time for a lot less than the $40+ US each of the 16x16 chips.... I'd be happy with a 32x32 crosspoint myself.... Plenty for controlling the instruments going to the board, and switching some key in-line effects in and out.... so theoretically 4 16x16 chips would do the job, but that's still a steep request for samples from AD, no? Just thinking aloud.... ;)
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Temat: DIY audio patchbay with digital routing....How hard?
GHAH AD8113 –14– THEORY OF OPERATION The AD8113 is a gain-of-two crosspoint array with 16 outputs, each of which can be connected to any one of 16 inputs. >:( So much for that idea.  I'm going to keep hunting for a suitable IC or combination of ICs.  Sorry for the red herring.
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Temat: DIY audio patchbay with digital routing....How hard?
...the JP should be today (the date didn't get pushed out!)... It's PLCC with those J legs and you can get/should use sockets for them so no need for SMD soldering. Chip's $17 (by the 100 from AD), but again we'd need the buffers so add $5. Both crosstalk and THD is similar to the 8813, and buffers add so little distortion it's hardly worth considering. Seems like it might be a good middle-of-the-road. Upside for some of you is that it's a bare- crosspoint so there's no fixed inputs and outputs. Also there's some work been done by others from which we can plagiarise take inspiration ;) http://www.circuitce.../45-Ciarcia.pdf http://synth.stromek...tml#Matrix32x32 We're spoiled for choice I guess ;)
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Temat: DIY audio patchbay with digital routing....How hard?
OK, my brain is starting to fail me here.... IF we go with the MT8816, I'm just trying to figure exactly how many you would need to get a true 32x32 crosspoint? The diagrams I have seen seem to use both of the 8x inputs (lets call that our "X") to interconnect pairs of MT8816s, but this theoretically limits the number of connections in the matrix to 8? The 16x16 chips are easy - 4 chips and you're there.... How many MT8816s would it take to do the job PROPERLY for a 32x32
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Temat: DIY audio patchbay with digital routing....How hard?
But surely to expand a crosspoint matrix, you would parallel the chips, not chain them? Ie (using 2x4x4 for clarity) [tt]     Y1  Y2  Y3  Y4     |  |  |  | X8  -+---+---+---+-     |  |  |  | X7  -+---+---+---+-     |  |  |  | X6  -+---+---+---+-     |  |  |  | X5  -+---+---+---+-     |  |  |  |  ...
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