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Chinese anal-probe waveform analysis on an oscilloscope.
By request, a look at the waveform of the dubious SM Player device that appears to be widely available on eBay. The output of the device is basically an H-bridge made from discrete transistors that can switch the polarity of the probes with pretty much direct connection of a capacitor charged to between 60 and 120V!
The output is in the form of 50uS pulses that alternate in polarity, and these can either be single pulses or sustained streams of pulses for continuous nerve stimulation. And that ties in with the fact that these units are just rebadged TENS (Transcutaneous, Electrical Nerve Stimulation) With the transcutaneous bit meaning "through the skin".
As such the units primary purpose is for stimulation of nerves to suppress pain and in doing so it causes pain. In the application it's being sold for this is a LOT of pain! And I think that must be the market it's aimed at.
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