Welcome!

[OpenBiomedicalImaging]

Hi all, 

Thanks for your interest and signing up to the discussion list after the low cost non-invasive biomedical imaging talk at 34C3. 

A few of us met up at a self-organized session and discussed pathways forward a couple of days after the talk. We discussed different strategies you could try to get better resolution including the idea of using a water bath instead of individually mounted electrodes, and rotating the electrodes around the object. Another conversation that came up was using something like this Pin Art style toy( https://en.wikipedia.org/wiki/Pin_Art ) to mold to the body part of interest. 

A couple of papers which were requested are linked here: 

1. Magneto Acousto Electrical Tomography(sound and current combined). http://www.mindseyebiomedical.com/MAET.pdf

2. Nir Grossman paper on current beam forming for focused write abilities. http://www.mindseyebiomedical.com/NonInvasiveDBS.pdf

There is a plan for a new hardware revision that'll be ready in a few months with more electrodes and differential referencing. A few people have requested the current BOM. The parts list is checked into the hardware repository inside the Gerbers folder: https://github.com/OpenEIT/EIT_PCB into an excel spreadsheet and you can upload it to your parts vender of choice(i.e. digikey) to get up to date numbers. Keep in mind that the current board design has extra test points, power strategies and things that could be removed as it's a development board, so it has more options than are strictly needed on it. 

Happy chatting. 

Jean

[Alvaro G. [Andor]]

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Hi everyone!

Regarding the BOM, I recommend all of you checking the free tool "Octopart". Simplifying a lot, it's a search engine for parts, where you load your BOM, and it will search all the parts in a several different distributors, compare prices, check availability, MOQ (minimum order quantity...)

As a test, so you can take a look,  I've loaded the BOM excel file into Octopart, and substituted one of the resistors, which wasn't available anymore:

https://octopart.com/bom-tool/wOlOEOZS

Happy new year!

On 01/02/2018 05:01 AM, OpenBiomedicalImaging wrote:
> Hi all, > Thanks for your interest and signing up to the discussion list after the low cost non-invasive biomedical imaging talk at 34C3. > > A few of us met up at a self-organized session and discussed pathways forward a couple of days after the talk. We discussed different strategies you could try to get better resolution including the idea of using a water bath instead of individually mounted electrodes, and rotating the electrodes around the object. Another conversation that came up was using something like this Pin Art style toy( https://en.wikipedia.org/wiki/Pin_Art ) to mold to the body part of interest. > > A couple of papers which were requested are linked here: > 1. Magneto Acousto Electrical Tomography(sound and current combined). http://www.mindseyebiomedical.com/MAET.pdf > 2. Nir Grossman paper on current beam forming for focused write abilities. http://www.mindseyebiomedical.com/NonInvasiveDBS.pdf > > There is a plan for a new hardware revision that'll be ready in a few months with more electrodes and differential referencing. A few people have requested the current BOM. The parts list is checked into the hardware repository inside the Gerbers folder: https://github.com/OpenEIT/EIT_PCB into an excel spreadsheet and you can upload it to your parts vender of choice(i.e. digikey) to get up to date numbers. Keep in mind that the current board design has extra test points, power strategies and things that could be removed as it's a development board, so it has more options than are strictly needed on it. > > Happy chatting. > > Jean > -- > You received this message because you are subscribed to the Google Groups "OpenBiomedicalImaging" group. > To unsubscribe from this group and stop receiving emails from it, send an email to openbiomedicalim...@googlegroups.com <mailto:openbiomedicalim...@googlegroups.com>. > To post to this group, send email to openbiomed...@googlegroups.com <mailto:openbiomed...@googlegroups.com>. > To view this discussion on the web visit https://groups.google.com/d/msgid/openbiomedicalimaging/1622962a-9c4c-43ca-b58a-6b080a318996%40googlegroups.com <https://groups.google.com/d/msgid/openbiomedicalimaging/1622962a-9c4c-43ca-b58a-6b080a318996%40googlegroups.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout.
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[Bionerd42]

Happy New Year, 
and thanks, Alvaro, for the import of the BOM into Octopart.

A few questions:
Is the PCB immediately available, or are you planning a collective order of the PCB, preferrably in Europe?
Do you know how to include European distributors (e.g., Reichelt) into Octopart?

thanks
42

Sent with ProtonMail Secure Email.

[Alvaro G. [Andor]]

Hi there,

I'd like to make a PCB order in January or February, probably at Seeed [1] or Elecrow [2], 5 to 20 units depending on the price and minimum order, so I have some spares just in case I break something, and also, if any of you wants some. Also, I'll need at least one stencil, and it will be my first time ordering one, so lets see if I don't screw it up :)

About Octopart, on the right of the "Preferred Distributors" column, there's an 'edit' button. There you can choose your preferred distributors. Can't see Reichelt but you can find other european distributors I've used before as Farnell/Element14, Mouser or RS. Also, some tweaking might be needed on the BOM, so more common versions of the products are listed, and then, more distributors can be chosen to buy that options.

PS: If you use Eurocircuits to create your PCBs, just remember the name is kind of a trick: some of the PCB fabrication facilities are out of europe, and depending on the process you choose, it'll be fabricated in India, Germany, Hungary or other places I cannot remember now. [3]

Cheers!

[1] - https://www.seeedstudio.com/fusion_pcb.html

[2] - https://www.elecrow.com/pcb-manufacturing.html

[3] - https://www.eurocircuits.com/eurocircuits-production-units-quality-labels/

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