A Few Relatively Simple "TENS" Circuits
Created in 2002. Revised July 10, 2011
I initially designed these circuits for a friend who had muscle problems and while he says they did work well for him, I "DO NOT" RECOMMEND THE USE OF THESE DEVICES BY ANYONE FOR ANY REASON. I ACCEPT NO RESPONSIBILITY OR LIABILITY FROM THERE ASSEMBLY OR USE IN ANYWAY.
These circuit are to be used at your own risk And I "DO NOT" imply any medical benefit can be obtained from their use.
I RECOMMEND YOU GET A DOCTORS ADVICE, BEFORE CONSIDERING USING THESE DEVICES!
Circuits 1 and 2
"T1" in Circuits "1 & 2" is a small audio transformer with the 8 ohm impedance winding connected to the Fet and the larger winding connected to the probe and ground. I Recommend using a "Mode" Transformer, Part Number 60-282-0.
The Turns ratio of the transformer determines voltage output.
A small 6 or 12 volt power transformer can also be used.
A transistor such as a 2N3055 can be substituted for the "FET" that is used in Circuits "1 & 2".
The Base connects to the Gate, the Collector to the Drain, and the Emitter to the Source. This change will result in a "Lower Power Output", but it still works.
The PCB for the Ten-1 also has provisions for a pot to control the Frequency of the 555. If you don't want to use this control, Just Short it out. If you do want this control, use a 1M or 2M Pot and Change R1 (2M2) to a 1M.
Schematic of Circuits 1.
PCB for Circuits 1.
Schematic of Tens-2.
PCB for Tens-2.
Picture Overlay for Tens-2.
Circuit 3, A "Low Voltage C-MOS" circuit. Tens-3 is a very low powered, low voltage version, using a choke. (No transformer) But It will light up an NE-2 bulb connected to the output, so it Exceeds 60 Volts out.
For Informational purposes only: Low powered versions of this type of device are used by some Accupuncturists and instead of pads, the signal is applied to the needles, giving a very localized effect.
Also, Different timing capacitors and resistors can be changed for different effects.
Circuit 3, PCB.
*Copyright © 2002 & 2010*