Thanks for your valid concern. I'm guessing a couple of 9 volt batteries
would be plenty adequate for the circuit, safe enough at my thumb given
worst-case, and last a reasonably long time at 4 fifteen minute sessions as
day.
I'd have sworn I had a schematic for something along these lines in my
files, but can't lay my hand on it.
I've got electrodes, op amps, precision resistors and caps, breadboards,
and wire.
Heck, I thought a schematic for something like this was in everybody's
pocket, and the assembly would be the challenge.
Getting the insurance company to fund a commercial one is looking easier
all the time.
Thanks for the thought.
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From: fpm@[EMAIL PROTECTED]
(Frank Miles)
Newsgroups: sci.engr.biomed
Subject: Re: Req: Schematic for BASIC electromyogram (EMG) - biofeedback
type device
Date: Fri, 2 Feb 2007 18:41:55 +0000 (UTC)
Organization: University of Wa****ngton
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In article <kxqwh.17361$%N3.16996@[EMAIL PROTECTED]
>,
<Joe@[EMAIL PROTECTED]
> wrote:
>
>Seems that it could be done with a handful of off-the-shelf parts. From
browsing the group, I've seen where these are often class projects.
>
>Purpose - Determine specific muscle maximum output.
>Input- Standard skin electrodes.
>Output - LEDs preferred over sound.
>Requirement - no programmable chips.
>Application - I severed the median and ulnar nerves (and a bunch of other
stuff) just above the elbow. After a couple surgeries, I've gained some
motion in my thumb, and I'm trying to exerecise it to the max muscle
activity level.
>I've used a commercial unit in the Occupational Therapy clinic, but it
has a fancy LCD display with mmv readings, timers, etc. that I don't need.
>I visualize an output of a simple string of LEDs. If I remember
correctly, the commercial unit displayed readings of 10 to 60 mmv,
depending on pad placement and fatigue level. With luck, this will
increase, but I don't know what normal limits are, and don't expect to get
anywhere near normal levels. Changing ranges would be a nifty.
>
>Seems it could be done with a power supply, amplifier, and LED driver
chip, or maybe easier. I've got a well stocked junk box.
>Any suggestions?
I've designed such devices, but I have to say - you want to be very
careful
in hooking yourself (however indirectly) to the power line. Especially
when you talk about getting your parts from a "junk box".
I'd recommend that you keep power demands low enough that you can run on
a smallish battery.
Good luck!
-f
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