There has been an old (fortunately working) T.E.N.S. electronic pain relief machine lying about the place which occasionally gets used when music making, only it is never very usable. The unit is too fiddly and the pads always come apart. So here is the trail of thought....
Using the tin, neatly house the T.E.N.S. add a spot of modification - circuit bending skills here, include the use of a contact mic between the T.E.N.S. pads to pick up the signal. Include some neat switches and buttons to control the unit and an output jack. Does it need an inbuilt speaker?? Hmm... maybe not (we will see how it goes and add one at a later date if necessary).
And there we should hopefully have a tidy drum box unit to run through effects or straight into an amp. Joy oh Joy!
Step 1: take the T.E.N.S. apart and look inside.
It appears that I will need a new battery holder and perhaps reconsider these flat batteries (expect some research is needed here as to what types). The switches are push to make and soldered flat to the circuit board, the rubber elements on the old T.E.N.S. case were the neat external buttons which triggered these. I will have to hunt about the tubs of switches and knobs for some replacements.
The circuit has several resistors, small capacitors and two slightly larger ones, two diodes (BZX from what I can work out), three voltage regulators C9013 G-042 and G-117 and G-051 plus what I think are three other diodes. Then there is something that looks like a housed coil?
The circuit board is a simple printed board with the connectors in place. There appears to be a memory unit (the black blob) but I may be mistaken. From the PCB there is the lead connectors going off to the two pads (which one would attach to hurt body part).
Time for tea now, so this will be completed at a sooner than later date.
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