Fully insulated channels? Answered
I was looking to TENS units for experimentation and to try to rid myself of knee pain without meds. I was also looking into potentially building one due to the fact that i could probably do it cheaper depending on how i decide to do it.
One of the TENS units i saw said that there was dual channels that were fully insulated, while another one i saw said duel channel but was not fully insulated. What does this fully insulated channel mean, and how would i do that in a DIY TENS unit?