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.


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.

Optional Changes:

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*