Many professionally made TENS units can cost hundreds of dollars. The goal of this project is to find information and build a smaller unit that can serve the same purpose.
A TENS unit stands for Transcutaneous Electrical Neural Stimulator. It sends small amounts of currents between two electrodes on the body at high voltages in order to stimulate the nerves and muscles. This can have medical advantages.
The part list for such a device, without using Arduino as the function generator is shown below, and the diagram is found here(To be linked).
NON-MODULAR PART LIST Parts
1x EF25 ferrite transformer
1x 4AA battery holder
4x AA Batteries
1x 100kohm pot
1x 2Mohm pot
1x 500ohm pot
2x SPDT toggle switches
2x LED (Different Colors)
Various lengths of small, stranded wire
TENS Printed Circuit Board (To be linked)
Circuit Enclosure(To be linked)
16mm knobs for pots
Semiconductors
1x MC34063 DC-DC converter
1x IR2155 MOSFET driver
1x LM334Z current source
1x 555 timer
2x IRF610 MOSFET (equiv 200V @>1A)
1x 39V 1W zenerdiode
2x 1N4936 500V diodes
3x 1N914 diodes
3x 1N4148 diodes
Capacitors
1x 100uF 16VW PC
1x 10uF 25VW PC
2x 10uF 16VW PC
1x 4.7uF 63VW PC
3x .47uF 100VW MKT(Ceramic)
1x .33uF 63VW MKT
1x .01uF 63VW MKT
1x .001uF 63VW MKT
Resistors
1x 100kohm
1x 47kohm
1x 18kohm
1x 10kohm
1x 2.2kohm
3x 1khom
1x 180ohm
1x 150ohm
1x 68ohm
1x 12ohm
1x .022ohm 5W