Interest in Muscle Stimulators
TLDR: I have designed a working muscle stimulator system, the schematics are available at the below link. I will be printing it soon. Pictures and links below.
Much of the work I do in my lab is on electrical stimulation of the muscle, and awhile ago I built a muscle stimulator (also known as an FES system, TENS unit, Russian stimulator, etc.). These systems are designed to artificially elicit muscle contraction through electrical stimulation and can be used basically anywhere on the body there exists a muscle to activate. They can be used for generation of movement, local pain relief, or building muscle mass.
The system I designed is a 12-channel FES stimulator that runs off an Arduino, and I'm planning on designing a much smaller (1 or 2 channel, capable of stimulating 1 or 2 muscle areas respectively) for personal use. It's probably going to be an Arduino shield (for those of you unfamiliar with either of those terms an Arduino is basically a mini-computer used for running small machines and a shield is an add-on that plugs into it) and the total cost of all components (including the PCBs) is around $30-40. Typical electrical stimulators cost anywhere in the range of $100-500, albeit typically containing more functionality than mine. If there is interest in the community I can release my designs, parts list, code that runs it, instructions for putting the system together, and instructions for safe use.
EDIT: The below documents are for a 2-channel FES stimulator. The dropbox link contains all the necessary documents I mentioned above.
Total Cost for Stimulator: $36 + shipping
Total Cost for Additional Peripherals: ~$70
Parts List: Google docs link
Arduino code: See dropbox link above
EAGLE files: See dropbox link above
Safety Warnings: Google docs link
Picture of current board design: