Re: Analog Input Board Recommendations

Hi Tim,




On Wed, 13 Nov 2002,
Tim Holy wrote:

> Hi Calin,
>
> I bought a 64-channel amplifier from Multichannel Systems
> (http://www.multichannelsystems.com/). You can pick the gains and cutoff
> frequencies over a fairly large range. My amplifier is not
> software-adjustable (though they do sell one that is), as I find that a

Thanks a lot for this info.  I forgot to look at that vendor.  I think
this signal-conditioner-in-a-box is _really_ appealing to me.

I am _strongly_ thinking of going this route, Tim.  I was also thinking of
building a panel box or somesuch.  Printed cirtuit board huh?


> single set of parameters works well for me. It was something like $4500 and
> is so small it almost fits inside your shirt pocket (not including external
> power supply). I've built single-channel amplifiers that were bigger than
> that...

Heh yes definitely.  We have done that in the past.. all on 1
bread -- it was bulky and only did 1 channel! :)

>
> On input & output this amplifier uses 68-pin SCSI-3 connectors. You do have to
> do a little work to route the signals into the 100-pin connector of the NI
> board. I built a panel box that provides easy access to the digital channels,
> analog output channels, triggers, etc., as well as the 68-pin connector for
> the analog input channels. NI sells a breakout box (SCB100 or some such) that
> I used for this purpose, but if I were to do it again I would design a
> printed circuit board, so that I could build 2 or 3 setups with little extra
> effort. If you decide to go this route, let me know and maybe we can
> collaborate on a design.
>
> Best,
> --Tim

Yes I would definitely like to collaborate and/or hear your ideas. :)

We are going to be doing in-vivo recordings on cardiac myocites in a
mapping-type configuration.  Basically this is going to be an 8x8 grid of
electrodes which will record voltages off the myocites.  We already built
the software for this (RTlab -- www.rtlab.org), and we are collaborating
with a lab in cornell ithaca for the part of the system that mounts the
electrodes onto the living tissue (it turns out its quite hard to get the
electrodes to gently caress the tissue without piercing it..)-- but we
still need to figure out the best appraoch for getting those wires into an
amplifier (and possibly some sort of low-pass filter?) and getting that
signal to a DAQ board.


A printed circuit board huh?  I, unfortunately, am not an EE or a hardware
guy. My degree is in Computer Science, of all things, and I am not sure
what you mean by that.  So you would ideally envision one board that
splits the 100-pin NI connector up and yields 3 different ports -- one for
the 68-pin SCSI-3, one for the DIO stuff, etc?

Best regards,

-Calin

Received on 2002-11-13Z21:06:07