[sdiy] Analog crossbars and backplanes

Paul Anderson wackyvorlon at me.com
Sat Nov 9 19:20:57 CET 2013


How about using a Cypress PSoC mixed-signal controller?

Sent from my iPhone

> On Nov 9, 2013, at 11:56 AM, Michael Bachman <bachmanm50 at gmail.com> wrote:
> 
> I use Microchip MCP42XXX 256 step digital pots for waveform mixing.
> And it works great there.  Seems like it work work well in a matrix.
> 
> Mike
> 
>> On Sat, Nov 9, 2013 at 11:45 AM,  <blacet at blacet.com> wrote:
>> 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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>> 
>> 
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