Nomical

DIY audio patchbay with digital routing....How hard?

216 posts in this topic

It's alive, it's just poor. We've some had good news on funds (almost there!), and discussions have occurred regarding mass production... Just trying to get something useful done while we tread water waiting on cash....

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will this only be developed on the new stm32 module or on the old core too now ??

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Both :)

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The project itself is not so intensive that it needs the STM32 to run, but running it on an STM affords all the usual advantages of a faster, higher density processor. (in this case, more matrix crosspoint chips can be updated in a given time, and more chips can be addressed (easily) in the first place)

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Is this still on anyone's bench?

Can I get the existing schematics or boards and try putting some together?

Chuck

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I scored 3 Analog Devices AD8113JSTZ for only 5 dollars!!!!! on ebay.US, shipping 4 dollars. :D

....but looking down the chip i am getting eye cancer when thinking of solder those tiny IC. There aren´t any sockets for LQFP am i right??:-/

I have been reading the whole data sheet and on the last pages there are suggestions for layouts and finally the AD evaluation board for the AD8113 in every detail, layer. The board is listet for 300 dollars, so i thing the won´t give it away that easy when asking for a free sample board:-/ Doing the board by myself by scanning the layout won´t be practicable  as the PCB has 4 Layers and i am only able to do double sides PCB!! It is stated on 2 pages that the board will have to have a proper and clever grounding plane so that the crosstalk can held down to a minimum

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Heheh yeh they're kinda small huh? ;)

I know that there's a lot there but... read through this thread, as we have discussed the board design in some length already, including such matters as how to possibly avoid the need for 4layer fabrication. I think the info will be helpful to you.

Remember to do your layouts in kicad (not eagle). That step was a 'must' for this project as the boards required are too large for free eagle.

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I am optimistic I can fit them within the freeware-eagle size limit ;) (this is me kidding btw, I haven't even seen the schem)

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Ye, I bet you could too!  >:(

*mutters something under his breath about those damned German engineers*

*drives away in his AMG*

:D

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Yeah...bloody damn german ingineers, getting lots of cash, driving big cars for don´t even getting their "Blaumänner" (german for working clothes, blue working pants) dirty :D... ;)

I ordered some free samples from National Semiconductor, only cheap op-amps...so to fill up my sample cart i couldn´t resist to clicked on the following:

http://www.national.com/pf/LM/LMH6583.html#Availability

The price is about 40 us dollras and in the same league like the ad8113, but the national  is clearly for video usage.

Hmm...now i got 10 of that damn expensive chip lying here on my desk and can´t even open the package:-D

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The problem with relay based matrices is that they are huge, and expensive.

TK:  :o What's THAT?! :D

but sound remain clean...............

hi guys

i'm looking to get a device similar (as concept) to the monster "matrix"

but much little then you done ,

nobody know how drive relay like this

http://images.google.com/imgres?imgurl=http://www.allspectrum.com/store/images/G5V1f.jpg&imgrefurl=http://www.allspectrum.com/store/product_info.php%3Fproducts_id%3D512&usg=__KnL0GTsc3uUFNSzhzYc3lAUyNbg=&h=300&w=300&sz=38&hl=it&start=1&um=1&tbnid=ggPnBVKpYGJWzM:&tbnh=116&tbnw=116&prev=/images%3Fq%3Drelay%2B5v%26hl%3Dit%26client%3Dsafari%26rls%3Dit-it%26sa%3DX%26um%3D1

or similar with gold plated contacts,

thanks in advance

in case you post some info about

regards

ww

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Are you feeding actual audio through this patching system? If so, I have a large quantity of 1/4 inch professional jack sockets which are surplus to requirements.  (Might also have 16 100mm log faders, but not sure as yet.) If you are looking for audio-mixer bits I might be able to help, perhaps a swap in payment?

regards and best of luck with your patch-bay.

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hello

thanks for post ,for now no  need trs etc...

i'm looking for build a "100% discrete" audio in out "switcher"

for my hi fi setup

kind regards

8)

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hi , you have to use relays or you get crosstalk. The best DMOS FET switch is like -107 crosstalk, thats clearly enough for a lot of things tho : ))

Several sellers are in bizness @ ebay for input selector, what else you wan in hifi?

These crosspoint switches have builtin opamps i dont lik those either.

http://electronics.shop.ebay.com/Home-Audio-/14969/i.html?_nkw=input+selector&_catref=1&_fln=1&_sac=1&_trksid=p3286.c0.m282

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