# Build a TENS Machine to Remove Pain

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A Tens machine is used to provide a drug free way of removing pain from your body ( TENS stands for Transcutaneous Electrical Nerve Stimulation )
.Here I will show you how to build your own Tens machine and reduce the amount of pills you use to stop pain .To Build this Tens unit, you will first need to buy a 555 timer IC . The 555 timer is very small about a quarter of the size of your finger nail .You can purchase one for about 25p from Maplins or Radio Shack etc .

There are 2 types of Tens machine. High Frequency Tens uses frequencies in the range of 80 to 100 Hz. This blocks the pain impulses going to the brain .

Low frequency Tens uses frequencies from 2 to 4 Hz . This will help the body produce its own endorphins and increase local blood flow to relieve pain ( this can last for hours ) .

Square waves are universally encountered in digital switching circuits and are naturally generated by binary (two-level) logic devices. They are used as timing references or "clock signals", because their fast transitions are suitable for triggering synchronous logic circuits at precisely determined intervals. However, as the frequency-domain graph shows, square waves contain a wide range of harmonics.

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## Step 1: Ooop's Statutory Warning

WARNING: The device is not designed for use above the neck or for individuals who have a pacemaker or other heart defects .This device should not be used by pregnant women & Girls .

SQUARE WAVE TRAIN
The “Square wave” permits the frequencies to penetrate the body more efficiently at any given Khz output. Square waves are considered the superior “frequency to wave” output for any Frequency generator device.

## Step 2: 555 Timer IC

I first started off placing the 555 timer in the center of the project and then build arround it .
A close up look of the Diagram will show you how the Pins from 1 to 8 on the 555 Timer is connected up . You can use this magnification to reference back to during your project .

Each pin is numbered from 1 to 8 .

## Step 3: How the Square Wave Is Generated

The ratio of the high period to the total period of a square wave is called the duty cycle. A true square wave has a 50% duty cycle - equal high and low periods. The average level of a square wave is also given by the duty cycle, so by varying the on and off periods and then averaging, it is possible to represent any value between the two limiting levels. This is the basis of pulse width modulation.

Parts List for a Low Frequency Tens Machine ( Generating the Square Wave ):

(1) 205 K ohm Resistor
(2) 233 ohm Resistor
(3) 5.01 M ohm Resistor
(4) 10 nF Capacitor
(5) 47 nF Capacitor
(6) 555 Timer IC
(7) 28.81ma Light Emitting Diode
(8) Rocker Switch
(9) 9 volt Battery
(10) Thin wire
(11) Solder ( and soldering iron ) or small bread board

Once all the parts are together you can start to wire up your project.

## Step 4: Low Frequency Tens Machine Diagram ( Wave: Asymmetrical )

We are building the Low Frequency Tens Machine at the moment .
Once all the parts are together they should be placed out and wired up shown in the diagram . You could either solder them together or connect them using a very small bread board .

If you find it difficult to see the values in the diagram, these are what they are :

(1) 205 K ohm Resistor
(2) 233 ohm Resistor
(3) 5.01 M ohm Resistor
(4) 10 nF Capacitor
(5) 47 nF Capacitor
(6) 555 Timer IC

When you wire up the the Light Emitting Diode, the resistor should be connected to the ( a or + ) Cathode ( the Long Lead ) side of the Light Emitting Diode .The short side connected to the negative or ground side .

## Step 5: High Frequency Tens Machine ( Wave: Asymmetrical )

To change your device into a High Frequency Tens Machine, you only need to replace 2 resistors .

Replace the 205 K ohm resistor with a 6.8 K ohm resistor
and
Replace the 5.01 M ohm resistor with a 167 K ohm resistor

(1) 6.8 K ohm Resistor
(2) 167 K ohm Resistor

The 2 red conducting pads shown in the diagram are the silver Foil covered pads to be placed on the body . To increase conductivity you can use hair Jell on the pads . Although you will not cause any damage to the unit, the +/- conducting pads should be kept apart from each other.

Here's a link showing proper placement of electrodes.

http://www.tens-store.com/ems/tensplacement.htm

You could place your finished project inside its own case . Remember to remove the batteries when not in use.

You can simulate this circuit by downloading some software on a free trial . Choose Electronics because the software has a number of Scientific options . Go to :

http://www.yenka.com/

## Step 6: A CURE FOR ALL DISEASES ?

To change your device into a medical device to cure diseases, you only need to replace 2 resistors and 1 Capacitor .

Replace the 6.8 K ohm resistor with a 9.6 K ohm resistor.
Replace the 47 nF Capacitor with 100 pF Capacitor
and
Replace the 167 K ohm resistor with a 236 K ohm resistor

Parts List

(1) 9.6 K ohm Resistor
(2) 236 K ohm Resistor
(3) 100 pF Capacitor

This would give an out put of 30 k Hz , to kill parasites in the body, raise the ph to remove acidic environments in the blood . Allow healing Lymphocytes to do their job properly .
The Square wave formula for all square waves is below . You can also visit this website for more information about what your device can achieve . Although their device is out of range of the Low Frequency TENS that you will be building .

http://www.huldaclarkzappers.com/?gclid=CPaXy77zkJwCFZgU4wodj1MCcQ

## Step 7: Lymphocytes

Lymphocytes are improved to Kill bad Bacteria within the body , by using electrical stimulation with square waves .

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## 43 Discussions

I built one of these yesterday. When I place the electrodes on my wrist as a test and then turn on the switch, I got a 2nd degree burn in two small spots from the positive electrode. What can I do to NOT get burned when using this device?

Use more conductive materials if you can, like some silver coated electrodes...and the next key step is the electrode gel...you can make your own out of some salt and water...yet best to buy the professional stuff IMHO.

Hi, can anyone please explain how this works? I understand the oscillator aspect, but will 9VDC really do the job?

What a fascinating post! I had no idea the TENS was so similar in action to the Robert Beck BE device. I think I'll be breaking out my soldering iron for this one. Much respect.

How do you generate the high voltage?

not getting output with either low frequency or high frequency device at 9V. What to do?

My commercial TENS unit is max 5V RMS, 100Hz, 100us pulse width. Which means the pulses are up to 500V, if I'm not mistaken. However, your device produces only 9V pulses. That's a big difference! I think this circuit diagram looks a bit more promising:

http://chemelec.com/Projects/Tens/Tens-4a.png

But thank you for telling us how to cure all diseases! I should try that too...

Actually I think I *was* mistaken, 5V RMS with a 1% duty cycle should translate to 50V peak voltage, since we divide by the square root of the duty cycle. Still a bit bigger than 9V.

This Instructable is garbage: here you simply repeat ideas not your own ( low f stimulates release of endorphins and high f blocks signals to the brain ) The evidence for any of this is wafty - what frequencies; what power output; what waveform. Worse, you drag out that nonsense about a 'cure for all disease', first propounded a hundred years ago by a crank called Rife. It was nonsense then and it's nonsense now.

"This device should not be used by pregnant women & Girls ."
I get the pregnant women thing. but why not used by girls? why?

otherwise i like the instructables :)

Not to be used by pregnant (women and girls), that is pregnant women and pregnant girls.

Can I add additional leads from the unit, so that I have 4 pads to apply to the areas instead of just 2 ? And will the electrical impulses be cut in half ?

Ok, where to begin. First, getting to step 6 reveals this is a commercial for a completely bogus product (Hulda Clark's Zappers). Running this circuit attached to your body does nothing but cause a tissue burn and possibly damages the deeper tissue with prolonged use. I refuse to call Mrs. Clark a Doctor because her "product" is a classic case of junk science. It promises to cure all diseases. Does that not set off alarm bells for anyone?

Next, not to be super critical, but this 555 circuit is not TENS simply because of the frequency output. You need to step the voltage up to at least 80-150 volts and introduce current limiting to no more than 80mA. Warning: simply stepping up the voltage from this device will give you a hell of a shock and can be lethal (10-15mA of current from arm to arm will stop your heart). Working with voltages higher than 40-50 volts can be very dangerous if you are not careful.

Lastly, I figure this post will probably get me banned from this site. I have no problem with someone attempting to build their own TENS unit. I do have a problem with junk science and viral marketing via sites like this. If you want to build a real TENS unit have a look at this article (unfortunately it's now behind a pay-wall):
http://www.siliconchip.com.au/cms/A_105712/article.html

This is a re-release of the same device Silicone Chips made in the 80's. If you search around there are scanned images from an older print-article covering the exact same circuit in an older style case. Schematic is here:
http://i3.tinypic.com/wlsm0n.jpg

4 replies

This is just an LED flasher, not even close to a TENS unit. ~9V square wave output (unregulated!) can't be felt, in fact the input voltage will fry the 555 (since most have a vmax of 5V). Just joined Instructables.com. Quickly learning that there is no peer review here. :-)

I think the lack of peer review is because the "be nice" policy is counter to the ability to refute and reject a design.
It may not be an advertisement, but it is the same sort of garbage medical woo that 'Dr' Hulda is promoting....
Oh wait, look down in the comments, it's a link to Hulda's Zapper. Woo! I'mma go buy one!

It doesn't seem to be an advertisement. Otherwise, "Dr" Hulda's front account that you claim this is would not have created so many 'ibles and been so active.

However, I agree with what you say about this not being TENS. Keeping in mind what little I know about electronics, what you said makes sense. In fact, I just bought a basic unit online for ~\$10. Although thats EMS... but still, it's far safer that tin foil.

Also, I found a scanned copy of the article a while back. Haven't gotten around to it but I might make an 'ible some day.

Hi, I'm doing a project with Electrical muscle stimulation and can't find anything on the net really. I don't come from an electronics background, so was just wondering how you calculated the values for the resistors? Thank you