[sdiy] Analog crossbars and backplanes

[blacet at blacet.com]

Digital pot ICs?

Last time I looked, seemed to be 128 steps so not so good for frequency
control but might make a good modulation matrix?

http://www.maximintegrated.com/products/data_converters/digi-pot/

> On 9 Nov 2013, at 15:15, "cheater00 ." <cheater00 at gmail.com> wrote:
>
>> On Sat, Nov 9, 2013 at 3:50 PM, Rainer Buchty <rainer at buchty.net> wrote:
>>> I think that an programmable analog crossbar is the better
>>> solution in your case. Saves you all the hassles of dealing with
>>> high-speed
>>> buses and you don't even need tons of ADC/DAC. Plus, scalability is
>>> rather
>>> easy to achieve.
>>
>> Dunno. Is it?
>>
>> Let's have a 16-voice modular, with a module that has 6 connections.
>> Don't you think this is a mite huge? That's 96 connections per module.
>> A reasonably sized modular will have on the order of 100-200 signal
>> sources and destinations. So you'd need 16 completely separate analog
>> systems that can each manage 100 inputs and outputs and route between
>> them. Are there any analog crossbar solutions that do anything on this
>> order of magnitude?
>> Then, each connection to the main hub must have additional line
>> drivers, because we're talking about distances on the order of a meter
>> or two.
>>
>> If you find something nice, let me know, but the last time we've
>> visited this topic on the list, there wasn't anything affordable or
>> interesting.
>
> Can we keep it realistic, please?
>
> No-one has ever built a modular with a patch panel with 100 inputs and 100
> outputs, let alone such a thing with 16 voices. If we're looking for
> solutions to such a crazy problem, it's no surprise that there aren't any
> answers.
>
> But there *are* good 16x16 and 32x32 crosspoint switches out there that
> are easily ganged together to build larger arrays. You could easily build
> something that would give you more options than the largest Ghielmetti
> patch pin panel you've ever seen, and has memories to boot. That's not
> bad, even if it isn't wish-fulfillment.
>
> T.
>
> http://www.ghielmetti.ch
> http://www.analog.com/en/switchesmultiplexers/analog-crosspoint-switches/ad8113/products/product.html
>
>
>
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