Electro stimulators are electronic devices used by athletes and other people who suffer from issues related to chronic pain. The stimulators are used primarily as a non-invasive method to stimulate fatigued muscle areas and diminish the pain from sore or aching muscles.
- Skill level:
Things you need
- 1 85 by 64mm 11101061 printed circuit board
- 1 134 by 69 by 23mm plastic cover
- 1 49 by 113mm front panel
- 4 Electrodes
- 1 25 by 15 by 10mm ferrite core
- 1 clip lead
- 1 9-volt battery
- 1 2-1/2mm printed circuit board mount
- 1 2-1/2mm DC plug
- 2 2mm electrode plugs
- 1 1-meter-long figure-8 twin-flexible cable
- 2 Printed circuit mounts with sliding switches [coded S1 and S2]
- 2 Integrated circuit sockets
- 3 15mm spindles [coded VR1, VR3, and VR4]
- 2 200mm cable ties
- 2 Printed circuit stakes
- 4 6mm screws
- 1 2-meter-long copper wire
- 2 Thermoplastic heat shrink tube (1 at 12mm; 1 at 15mm length)
- 1 MC34063 DC/DC converter [coded IC1]
- 1 IR2155 Mosfet driver [coded IC2]
- 1 LM334Z Current source [coded IC3]
- 1 7555 CMOS timer [coded IC4]
- 2 STP6N60E N-channel MOSFETs [coded Q1 and Q2]
- 1 39-volt Zener-diode [coded ZD1]
- 1 10-volt Zener-diode [coded ZD2]
- 2 Fast diodes [1 coded D1 and D2]
- 3 1N4148 Switch diodes [coded D3, D4, D5]
- 1 N5819 1A diode[coded D6]
- 1 100 Microfarad 16 volt capacitor
- 1 10 Microfarad 16 volt capacitor
- 1 4.7 Microfarad 63 volt capacitor
- 3 470nF MKT capacitor
- 1 330nF MKT capacitor
- 1 100nF MKT capacitor
- 1 2.2nF MKT capacitor
- 1 50k ohm resistor
- 1 100k ohm resistor
- 1 47k ohm resistor
- 1 10k ohm resistor
- 1 2.2k ohm resistor
- 1 1k ohm resistor
- 1 180 ohm resistor
- 1 150 ohm resistor
- 1 27 ohm resistor
- 1 12 ohm resistor
- 1 0.22 ohm 5W resistor
- 2 1M ohm trimpots [coded VR1 and VR3]
- 1 100k ohm multi-turn trimpot [coded VR2]
- 1 1k ohm horizontal trimpot [coded VR4]
- Soldering iron
- Wire cutter
- Wire stripper
Insert the two printed circuit stakes at the lower left-hand corner of the printed circuit board; insert all of the resistors according to the diagram provided and solder them.
Insert the 39-volt zener-diode, the 10 volt diode, the two fast diodes, the three switch diodes and the 1A diode according to the diagram.
Mount all of the capacitors to the printed circuit board (see diagram).
Cut up the integrated circuits into five separate contacts with the X-Acto knife; remove two pin contacts on each socket. Put the integrated circuits into the printed circuit board; solder them on the backside of the board. Mount the sliding switches to the integrated circuit sockets.
Solder the trimpots to the printed circuit board. Place the point of each spindle facing in the direction of the trimpot; solder it into position.
Mount the N-channel MOSFETs to the upper right-hand side of the printed circuit board.
Wrap the copper wire around the ferrite core, weaving the copper around the right-hand side of the core, turning 44 times. Repeat the process on the left-hand side, turning 17 times. Strip off the wire ends and solder to the printed circuit board. Tie down core with cable ties.
Mount the LED1 to the printed circuit board 15mms above it. Connect the printed circuit board to the plastic cover base, using four of the 6mm screws.
Connect the front panel to the top section of the plastic cover. Drill a hole in the lower portion of the case; insert the DC plug and connect it.
Feed the battery wires through the plastic cover into the back compartment of the case: affix with cable tie. Solder the battery wires to the printed circuit stakes using the thermoplastic heat shrink tube. Cover N-channel MOSFETs tabs with the remaining thermoplastic heat shrink tube.
Use the 2-1/2mm plug and the 2mm plug to make leads for the electrodes; attach the four electrodes to the leads. Insert the 9-volt battery.
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