3 votes

Inexpensive, reusable electrodes for EMG

4 comments

  1. Nmg
    Link
    The second one seems to use the same encapsulation as porous graphene electrodes that I used in a class. We more or less did this: https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201901981...

    The second one seems to use the same encapsulation as porous graphene electrodes that I used in a class. We more or less did this: https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201901981

    The encapsulation material evidently is called "polyimide."

    2 votes
  2. [2]
    pseudolobster
    Link
    A brief search seems to imply EMG, EEG, and ECG/EKG all use the same electrodes. Typically it looks like most are disposable, single-use items, probably for hygiene reasons and also because they...

    A brief search seems to imply EMG, EEG, and ECG/EKG all use the same electrodes. Typically it looks like most are disposable, single-use items, probably for hygiene reasons and also because they come pre-gelled.

    I worked on an EEG project a couple years ago, and came across a few DIY projects. The one I can find off-hand is called OpenBCI, and they have a shop where they sell the usual disposable electrodes (here) as well as these gold cup ones. I seemed to recall them having a community forum or some kind of DIY guide to these things, but the best I can find is this, which is just links to their shop. In any case, there exists a DIY community of brainwave enthusiasts, who use what I think are compatible electrodes.

    Anyway they don't seem to be any cheaper than commercial suppliers. On that site I was able to find silver chloride electrodes that look a lot like the ones in your pic.

    From what I can gather, it seems like these electrodes don't need to be particularly sophisticated, and you could probably get by with speaker wires taped to the body. The real challenge I guess would be compensating for the electrical properties of whatever probes you use. Surely these things have a known resistance, inductance, capacitance, etc, which makes them easy to calibrate for in software.

    2 votes
    1. DaveJarvis
      Link Parent
      I've passed this along, thank you. They look very close. We'll see if that material works!

      silver chloride electrodes

      I've passed this along, thank you. They look very close. We'll see if that material works!

      1 vote
  3. DaveJarvis
    Link
    Several years ago, a friend of mine was given electrodes that can be used to detect tiny EMG signals. Most of the electrodes, after several years, have since corroded or are otherwise unfit for...

    Several years ago, a friend of mine was given electrodes that can be used to detect tiny EMG signals. Most of the electrodes, after several years, have since corroded or are otherwise unfit for further use. My friend was never told anything about them and in the intervening years, the point of contact has all but disappeared.

    Does anyone recognize the electrodes and, if so, know their formal name and where they can be purchased? If not, does anyone know someone who may know?

    Any help hunting them down is greatly appreciated.

    1 vote