(Second request - edited)
Seems that a VERY basic EMG device could be constructed with a handful of off-the-shelf parts. From browsing the group, I've seen where these are often class projects.
Thanks to the group, I've been given some links to block diagrams, but I need more detail - parts values and a wiring diagram.
Purpose - Determine specific muscle maximum output. Input- Standard skin electrode pair. Output - LEDs preferred over sound. I visualize a simple string of LEDs. 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, yet stop before the muscle is over-fatigued.
I've used a commercial unit in the Occupational Therapy clinic, but with many bells and whistles that I don't need - LCD display with mmv readings, timers, sound options, etc. 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 - 100 mmv max should be adequate. Changing ranges would be a nifty.
Unit must be cheap - crude, if need be. A simple gazinta / comesouta is fine. Lights or meter for indication. On the lines of a science fair project would be adequate.
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. Working definition of 'junk box' - 'Term used by electronics hobbyists describing that assortment of parts, usually acquired over an extended amount of time from numerous sources, with condition ranging from new and still in original packaging to new or used and mounted on boards or sub-assemblies.' We're not talking about a shoe box here. You should ask my wife. :)
As far as skills, that's changed a tad, which leads to my request. I've breadboarded a lot, and made enough basic one-sided circuit boards to be comfortable with the process. Now, I call whatever I do 'therapy', and often recruit family to hold things for a second. :)
Thanks for the help, and if it can't be done I'll quit bothering the group.
Any suggestions?