I reverse engineered some existing device, there are TONS of safety measures.
At least: current limiting resistor, transformer, voltage/current feedback, GND isolation, MCU protection.
After replicate all of these, I still not brave enough to try it myself, I just find it too dangerous.
PS: TENS device is fun. article seems like a bait.
Has anyone ever seen something like a TENS shirt or shorts that has the pads built-in?
> Each electrode channel is tied to a finger pad
but the layout shows the finger pads are all tied together. What am I missing?
That is NOT how one uses lithium batteries one foe snot want to go boom. Consider 3.6V as empty. Discharging them down to 3.0 can cause them to go boom when recharged...