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Interested in tDCS, what it is, tDCS devices,

how it can be used to improve learning,

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SpeakWisdom

About Presentations Speaking tDCS

102013

User-Built tDCS Research DeviceIve been tinkering with tDCS for several months now including doing lots of reading and

building of prototype devices. I also have a numberof friends who are giving it a try. Along

the way Ive learned a number of things that could be useful to others:

1. Read, read, read. Lots of tDCS artic les and dialog are on the web and more every day.

2. Seek professional help with tDCS if at all possible. For example www.

transcranialbrainstimulation.com

3. Safety first! Read mine and other articles about tDCS safety. http://www.speakwisdom.com/tdcs

4. The popular ActivaDose II seems to be a good device for tDCS abit edgy in its current regulation

which may be irritating to some

5. tDCS devices built around the LM334 seem to work very well and provide very smooth adjustments

to current level

6. Information on treatment montages isa bit scattered, but getting better (see my doc below for a

start)

In conjunction with the above, here is the schematic I use to build devices to tinker with. There are

many other designs on the web.

(This is my favorite design. Simple, smooth, works.)

(Almost done. A bit more soldering)

F E B 84

Get your FREE foc.us tDCS Headset

User Guide (pdf). Now ver 2.2. Clickthe image below.

Click tDCS at the top for more!

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(Completed except for labeling. Simple, solid, reliable!)

(Digital meter in place of analog.)

(Same basic design, just digital mA meter.)

And finally, here is a link to a bit of doc Ive written for use with the home-built tDCS research device

and ActivaDose II.

http://dl.dropbox.com/u/491815/tDCS%20Session%20Setup%20with%20tDCS%20Research%20Device%20OR%20ActivaDose%20II.doc

Comments and suggestions are welcome.

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By SpeakWisdom Tagged diy tdcs, tDCS, tdcs design, tDCS Device, tDCS kit, transcranial

tDCS Thoughts on Safety for the Amateur

DIY tDCS Safety Standards

84 comments on User-Built tDCS Research Device

PINGBACK:Weekend tDCS Insights - Chi & Snyder, SpeakWisdom, Carlo Miniussi |

DIY tDCS

PINGBACK:DIY tDCS Start Here Page | DIY tDCS

John Humphrey

FEBRUARY 10, 2013@ 10:42 PM

Excellent! Thank You!

REPLY

Keith SpauldingFEBRUARY 11, 2013@ 12:36 PM

Did you see a difference in the waveform for the ActivaDose II device compared to

the DIY LM334 circuit?

Did you notice a difference in the sensation (burning, f lashing) for the ActivaDose II

device and compared to the DIY LM334 circuit?

Very nice entry, thanks for the information.

REPLY

SpeakWisdom

FEBRUARY 11, 2013@ 1:04 PM

My observation is that the LM334 produces a much cleaner output thandoes the ActivaDose II. Again my observation: The ActivaDose II

produces more flashes and irritation than does an LM334 based device.

See http://www.speakwisdom.com/tdcsfor an article I did on tDCS and

ripple.

Brent

REPLY

David Winn

FEBRUARY 27, 2013@ 12:21 PM

While surfing the Inteernet about TDCS and CES, I found a site called

TransHumani.com that linked to a forum portal, where a member discussed unit he

had built (and sold). Seemed to be quite knowlegeble ob the build process and

implementation. Unfortunately I wasnt able to register on the wiki sitein order to

contact him. The post is CES/TDCS Devices For Sale at

http://transhumani.com/topic78.html.

REPLY

Prami Abuser

MARCH 9, 2013@ 1:59 PM

you didnt answer my question but it was a stupid question, anyways where

did you buy the digi meter, Ive built the exact device base on your

schematic and per your documentation have begun to to do savant

stimulation.

My real question would be, where do i stimulate to improve my math and

problem solving sk ill, s ince im a mech engineer student and we solved a

REPLY
http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=344#respondhttp://www.facebook.com/prami.abuserhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=329#respondhttp://transhumani.com/topic78.htmlhttp://www.diytdcs.com/2012/06/diy-tdcs-start-here/http://www.diytdcs.com/2013/02/weekend-insights-chi-snyder-speakwisdom-carlo-miniussi/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=315#respondhttp://www.speakwisdom.com/tdcshttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=314#respondhttp://www.dcstimulator.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=313#respondhttp://diytdcs.com/http://speakwisdom.wordpress.com/2013/02/26/introduction-to-tdcs-devices-treatment-and-more-part-1-of-many/http://speakwisdom.wordpress.com/2013/02/07/recent-press-about-tdcs-word-is-getting-out/http://speakwisdom.wordpress.com/tag/transcranial/http://speakwisdom.wordpress.com/tag/tdcs-kit/http://speakwisdom.wordpress.com/tag/tdcs-device/http://speakwisdom.wordpress.com/tag/tdcs-design/http://speakwisdom.wordpress.com/tag/tdcs/http://speakwisdom.wordpress.com/tag/diy-tdcs/http://speakwisdom.wordpress.com/2013/10/31/diy-tdcs-code-of-safety/http://speakwisdom.wordpress.com/2012/08/27/tdcs-thoughts-on-safety-for-the-amateur/

5/21/2018 TDCS Gert

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lot of math and Force equationif you know what I mean?

SpeakWisdom

MARCH 9, 2013@ 5:13 PM

Sorry I missed the questions. You can buy the digital meters

on EBay and Amazon. I get the 0-20 mA meter.

Ill have future posts regarding electrode placement based on

studies published on the web.

Brent

Prami Abuser

MARCH 9, 2013@ 3:17 PM

I wonder what happens if you go beyond the 25 min recommendation time, and go for

like a full 8 hour like sleep and leave it on all night?

REPLY

SpeakWisdom

MARCH 9, 2013@ 5:13 PM

I have no idea, but would not recommend it.

Brent

REPLY

John A

JUNE 25, 2013@ 2:09 AM

Well in my experience:

Firstly, your sponge electrodes- you should be using sponge electrodes-

will dry out long before the 8hr mark. Unless youre in a rainforest or

something.

Secondly, the longer you continue a run the greater the chance one of your

electrodes will come part-way off and possibly give a significant burn

before you awake. This is very unlikely with sponge electrodes at least.

Finally, after a run of 1, 2 or 3+ hrs youll f eel a bit like a hangover is

passing. There are almost certainly chemicals like neurotransmitters and

nutrients being exhausted in the effected cells which will need to be

replenished.

Its far from clear how long an ideal run should be or the rest required

thereafter. 20-20mins is entirely reasonable yet its status as the Norm is

more to do with the nerve of the earliest experimenters than anything else;

thats what they did and so the literature consists of the replications.

At some point there will be good information on effects and consequences

of various durations and current densities, montages, even wave-forms

and frequencies- but not yet.

REPLY

John A

JUNE 25, 2013@ 2:21 AM

PS, 20-20mins shouldve been 20-30mins.

While Im at it I should stress that I saw no particular benefit to

runs of ten times longer than standard practice. Its difficult to

say without large scale replication of blinded trials but the only

obvious difference is that sense of a fading hangover, which

feels less like one fading the longer you go.

SpeakWisdomJULY 4, 2013@ 2:05 PM

There are studies already completed that show diminishing

returns after 20-30 minutes of treatment. I havent seen anything

that indicates longer treatment time adds value.

Brent
http://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=620#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=348#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=346#respondhttp://www.facebook.com/prami.abuserhttp://speakwisdom.wordpress.com/

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John A

JULY 23, 2013@ 6:51 PM

Good to know, thanks. BTW, does that apply to both anodal and

cathodal stimulation?

Dave Winn

MARCH 11, 2013@ 9:44 AM

Please excuse my ignorance on some of this. I understand the basic principle of

TDCS, the current flow and most of the parts, but am a little confused on the

electrodes. Many articles talk about Anode and Cathode electrodes. Is it the type of

material inside the electrode that determines if it s one or the other? Or, is there

some other factors? When I looked up sponge electrodes on the Internet, the

descriptions do not appear to have any reference to the electrode being Anode or

Cathode. Do electrodes come individually or as a set and when looking at the

electrodes, how do you tell the difference? Thank you!

REPLY

SpeakWisdom

MARCH 11, 2013@ 11:29 AM

Hi Dave,

The anode is the positive electrode, the cathode is t he negative elect rode.Electrodes seem to be mostly sold individually so two must be ordered.

Brent

REPLY

Dave Winn

MARCH 11, 2013@ 12:19 PM

But is each electrode somehow identified as Anode or Cathode.

Maybe Im missing something, but the online sales sites dont

seem to identify the electrodes as being Anode or Cathode. As

Iunderstand it, the current flow process is determined by wether

the ANode or Cathode electrode is connected to the positve side

(hopefully I said that right).

SpeakWisdom

MARCH 11, 2013@ 4:42 PM

The anode is the electrode connected to the positive lead of the

tDCS device. The cathode is the electrode connected to the

negative lead of the tDCS device.

Brent

Alex M.

MARCH 25, 2013@ 7:08 PM

I would like to see a source list made of the components and a reliable supplier.Construction techniques would be very useful too. Your hard work is appreciated.

REPLY

SpeakWisdom

APRIL 5, 201 3@ 3:16 PM

You should find my latest post helpful.

Brent

REPLY

Omega Ra

OCTOBER 31, 2013@ 3:27 PM

Which post is that? I am looking for a BOM for this, as most ofit seems to be Radioshack parts (though I dont see a 100-Ohm

pot at Radoshack)
http://omegara1.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=389#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=366#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=356#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=354#respond

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SpeakWisdom

NOVEMBER 1, 2013@ 6:57 AM

100 ohm potentiometers are available from several vendors.

Google search to find the best deal.

Brent

Sophmore-WizeFool

JULY 3, 2014@ 11:26 PM

Which post? I took a look at your blog post directly after thisone

(http://speakwisdom.wordpress.com/2013/02/26/introduction-to-

tdcs-devices-treatment-and-more-part-1-of-many/) and didnt see

anything on parts. Where did you purchase the case for your

analog model? Do you have a part number for the case? Your

hard work is much appreciated.

SpeakWisdom

JULY 14, 2014@ 2:52 AM

There are many parts sources on the internet (including ebay

and Amazon.) The case I used came from Radio Shack.

Brent

Gill

APRIL 3, 201 3@ 7:08 AM

Hi Brent, forgive my ignorance of electrical engineering, but is your current control

knob attached to the potentiometer? Im assuming that the pot is what youre using

to control the current with the LM334. Or am I sorely mis taken?

REPLY

SpeakWisdom

APRIL 5, 201 3@ 3:16 PM

Yes to a potentiometer.

Brent

REPLY

Alex

APRIL 5, 201 3@ 11:13 PM

Ace!

I need a back up machine. I do tdcs everyday at least 2x a day 8 hours apart

different montages. Depression, motor cortex and language area (behind my left

ear).It has changed me. I feel as if my brain is doing better than before i did tdcs. A

bit faster, i am not depressed, I am afflicted with bipolar 2 depression. when you

suffer from an illness that results in 20% of those afflicted trying to kill themselves

and 11% doing so something that works is so great. It REALLY helps with pain. Not

to make this available to people suffering is a shame. Of course I am very lucky.

extrapolating from various studies is at best hit or miss as to what will really happen

to you. I have also made mistakes. Fortunately I make an effort not to do anything

that i find uncomfortable twice. So I must say please try to do this right. Consistency

seems to reinforce neuroplasticity. I know that this empirical approach probably rubs

the theorists wrong but I am your lab rat. Thanks for your excellent work.

Oh yeah my verbal memory seems increased and oddly enough my handiness that

is I have been very left handed but now not as much. supposedly this is due to

tdcss influence on the motor cortex.

REPLY

shan

JUNE 19, 2013@ 11:31 AM

I have procured a tdcs device. My doctor gave me tdcs for depressio for 8

days, helped me alot. I am gonna do it on my own now. Do u recommened

tdcs everyday for a couple of hourss?? is it safe if done more than an

hour??

REPLY
http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=614#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=391#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=388#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=382#respondhttp://speakwisdom.wordpress.com/http://speakwisdom.wordpress.com/2013/02/26/introduction-to-tdcs-devices-treatment-and-more-part-1-of-many/http://speakwisdom.wordpress.com/

5/21/2018 TDCS Gert

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SpeakWisdom

JUNE 20, 2013@ 6:00 PM

Hi Shan,

I dont prescribe tDCS treatment scenarious. You need to do

some serious reading on tDCS and current practices. Most

users stay with the research norm of 20 to 30 minutes up to

several days per week.

Best of luck.

Brent

Terry Dowd

OCTOBER 4, 2013@ 6:20 AM

Bob Beck said when using CES stimulation more than 40

minutes per session will negate the positive effects. As John A

stated above long sessions will deplete your neuro chemicals

Dr. Bob Beck recommended 20 minutes 1 or 2 t imes daily.

chillgrooves

JULY 16, 2014@ 3:29 PM

Alex Exactly which device were you using? I want to be sure the one I

buy (for me, my first device) gives me results as least as good as yours,

as I suffer from similar issues to yours. Thanks!

REPLY

Alex

JULY 16, 2014@ 5:16 PM

I use a Chattanooga Ionto and have a Dupel which is the same

thing, as a backup. Any iontophoresis machine with similar

specs would be fine too. You have to get Arex sponge

electrodes separatly and attach bannana plugs instead of the

clips that it comes with. Easy to do.

Josh HouleJULY 3, 2013@ 5:17 PM

could we get a higher resolution view of the schematic? I cannot read the text around

the switch or LED.

REPLY

SpeakWisdom

JULY 4, 2013@ 2:13 PM

Ill try to make a more permanent link on my blog. But for now, here is a

link to the schematic in my Dropbox.

https://dl.dropboxusercontent.com/u/491815/User%20Built%20tDCS%20Re

%20Brent%20feb%202013.JPG

Brent

REPLY

Josh Houle

JULY 14, 2013@ 1:44 PM

Thanks! I built it, but I have not tested it yet, as my electrodes

have not arrived yet.

Josh Houle

JULY 14, 2013@ 2:22 PM

I have built this device. When I test it with a 5k resistor or larger as a test load, it

operates as expected, turning the pot changes the amperage between .5 mA and 2

mA. If I use a resistance much lower the max current will be higher. Is this the

correct operation for this c ircuit?

REPLY

Josh Houle

JULY 14, 2013@ 2:24 PM

REPLY
http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=639#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=638#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=628#respondhttps://dl.dropboxusercontent.com/u/491815/User%20Built%20tDCS%20Research%20Device%20-%20Brent%20feb%202013.JPGhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=624#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1394#respondhttps://plus.google.com/117176885902458722348http://speakwisdom.wordpress.com/

5/21/2018 TDCS Gert

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That is when I use a resistance lower than 5k turning the pot all the way to the right

creates a current higher than 2mA.

edward

OCTOBER 21, 2013@ 9:50 AM

where did you find a digital meter that could monitor a 1mA current? all the affordable

ones i ve seen wouldn t go under a 200mA sensitivity

REPLY

SpeakWisdomOCTOBER 21, 2013@ 6:27 PM

Check EBay. They have analog and digital meters that will read very low

current levels. Ive seen some on Amazon, too.

Brent

REPLY

John A

OCTOBER 22, 2013@ 3:36 AM

Huh? Excuse me but even the $5 throw-aways sold at Harbor Freight read

my 2mA output with several of them all agreeing to within 10% or so of the

same value.

REPLY

buckshotcharlie

MAY 20, 2 014@ 2:58 PM

I believe this is one.

http://www.aliexpress.com/s tore/product/0-36-Digital-Ammeter-Red-LED-

Display-DC-0-20-00mA-Current-Measurement-Amperemeter-Ampere-

Meter/402798_676925798.html

REPLY

SpeakWisdom

MAY 21, 2 014@ 12:34 PM

That looks like it will work.

Brent

fatetrader2013

OCTOBER 23, 2013@ 8:19 AM

SpeakWisdom, can you please post pictures of your device interior?

REPLY

SpeakWisdom

OCTOBER 24, 2013@ 7:12 AM

All of my constructed devices are in use. Interior photos will have to wait

till I build another.

Brent

REPLY

Ron

OCTOBER 28, 2013@ 11:31 AM

This is great.

2 things:

1. what does it say above the red lead, anode on your circuit blueprint?

2. why does the Reddit Tdcs unit have the meter before the LM334 and the

potentiometer?

Wouldnt that mean you schematic is the only correct one because it is able to

varying the current prior to a readout from the meter?

REPLY

SpeakWisdom

OCTOBER 29, 2013@ 1:49 PM

Hi Ron,

REPLY
http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=767#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=766#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=763#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=761#respondhttp://fatetraderblog.wordpress.com/http://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1246#respondhttp://www.aliexpress.com/store/product/0-36-Digital-Ammeter-Red-LED-Display-DC-0-20-00mA-Current-Measurement-Amperemeter-Ampere-Meter/402798_676925798.htmlhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=760#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=759#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=758#respond

5/21/2018 TDCS Gert

9/18

Sorry it does not show up better. It says LED & Resistor pair. Suggest RS

276-0209.

Brent

fatetrader2013


SpeakWisdom, can you have a look at this design, it is basic but I need something

like this to start with.

I made it just like this guy and it works, question is is it done the right way?

REPLY

fatetrader2013


This is the right link

REPLY

fatetrader2013


it keeps posting the wrong video, the title is My tDCS device and if you type it on

you tube it is the first one from the top

REPLY

Bobsled

NOVEMBER 18, 2013@ 1:43 AM

Hi, need help with electrodes. How large? Can you/should you use larger electrodes

to effect greater area. Im particularly interested in cath for reducing cortical hyper

excitability. How do you maximize electrode contact thru thick hair? For cath where

should one place anode? Again reducing excitability is key.

Any thoughts would be appreciated.

REPLY
http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=836#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=793#respondhttp://fatetraderblog.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=792#respondhttp://fatetraderblog.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=791#respondhttp://fatetraderblog.wordpress.com/

5/21/2018 TDCS Gert

10/18

SpeakWisdom

NOVEMBER 21, 2013@ 9:39 AM

Most that I am aware of are using Amrex 22 or 33 electrodes available

from Amazon and many others. They are sponge electrodes that you wet

with saline. Seem to work well through hair.

Brent

REPLY

Neil Rudnick

DECEMBER 2, 2013@ 4:30 PM

Hello Dr. Williams. Im a novice with electronics. Can you recommend a source forlearning circuit building? I have a few questions about how/why the c ircuit is built the

way it is. Like, why is there a 15 Ohm resistor after the pot?

Thanks!

REPLY

SpeakWisdom

DECEMBER 12, 2013@ 4:59 PM

Hi Neil,

That resistor is present to make sure the resistance between the two leads

can not go to zero, thus limiting the current range of the regulator.

I dont know of a specific electronics tutorial site, but Im pretty sure you

could find a few via a Google search.

Brent

REPLY

tom

JANUARY 5, 2014@ 5:14 PM

hi how do i make this, could you upload a video or step by step guide on how to build

this? thanks tom

REPLY

SpeakWisdom

JANUARY 6, 2014@ 2:46 PM

Hi Tom,

I have no plans to make available more detailed construction guidance at

this time. You might want to take a look at the commercial products now

coming into the market, some very inexpensive.

Brent

REPLY

keith

JANUARY 7, 2014@ 10:40 AM

Hi Brent,

Do you know of any devices coming out that we dont know of?

keith

SpeakWisdom

JANUARY 8, 2014@ 10:28 AM

Hi Keith,

No Im not aware of anything that is not already out there.

Hopefully some new tDCS devices are on the way though.

Brent

Bart

JANUARY 30, 2014@ 3:10 PM

Brent, sounds like for the complete novice, youd recommend the ActivaDose II,

based on the original post here, is that correct and/or do you have any comments

about the Foc.us device in comparison, Im ready to order one and get going.

REPLY
http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=993#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=964#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=962#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=888#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=864#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=843#respondhttp://speakwisdom.wordpress.com/

5/21/2018 TDCS Gert

11/18

SpeakWisdom

FEBRUARY 2, 2014@ 8:44 PM

Hi Bart,

I like all of the devices on the market for specific situations. Youll find the

Activadose II used a good bit in the research and medical world, but the

foc.us headset has advantages in ease of use and portability. They are

both good products and there are others!

Brent

REPLY

Bart

FEBRUARY 5, 2014@ 12:39 AM

Thanks Brent, I have ordered the Foc.us! Looks like it will arrive

within two days and Ive got your User Guide ready to go, will

post more later, thank you so much for the information!

chillgrooves

JULY 16, 2014@ 3:32 PM

HI Bart (or anyone who can chime in), has Foc.us worked for you? How did

its effectiveness compare to the ActivaDose II? Im trying to choose my

first device, whether cheaper or more expensive,

REPLY

DMR

FEBRUARY 4, 2014@ 11:18 AM

Brent from the pictures, it looks like you step up from the analog to digital meter

easily. According to one of your previous posts, the meter needs an outside current

source. Did you just syphon some of the electricity from the 9v, or did you add an

additional battery to the source?

REPLY

SpeakWisdom

FEBRUARY 4, 2014@ 1:24 PM

I prefer to use a small 12v cell for tDCS and a 9v battery to power the

display.

Brent

REPLY

buckshotcharlie

MAY 20, 2 014@ 11:16 AM

Brent, Do you have a circuit diagram that includes both

batteries? Thanks for your work and guidance.

SpeakWisdom

MAY 21, 2 014@ 12:35 PM

Im working on a more step-by-step build article that I think will

be helpful.

Brent

Juan Rasmussen

MAY 17, 2 014@ 8:33 PM

Are you using the LM334Z? I found a few different ones with different letters at the

end of the numbers.

Amazon:

REPLY
http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1241#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1006#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1005#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1395#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=999#respondhttp://speakwisdom.wordpress.com/

5/21/2018 TDCS Gert

12/18

6pcs LM334Z National Semiconductor Constant Current Source IC TO-92

SpeakWisdom

MAY 21, 2 014@ 12:39 PM

That should work fine.

Brent

REPLY

Juan Rasmussen

MAY 17, 2 014@ 8:42 PM

Also, is your 470ohm, 100ohm, and 15ohm all resisters?

REPLY

SpeakWisdom

MAY 21, 2 014@ 12:38 PM

Yes RadioShack has them.

Brent

REPLY

buckshotcharlie

MAY 20, 2 014@ 12:16 PM

Brent, I am t rying to source the component parts t o build the User-Built tDCS

Research Device. This is my list so far.

LIST OF COMPONENTS

======================Type 23A 12v Battery

REPLY
http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1245#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1251#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1242#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1252#respondhttp://speakwisdom.wordpress.com/http://www.amazon.com/LM334Z-National-Semiconductor-Constant-Current/dp/B00B5LUIW8/ref=ps_luc_1_1http://www.amazon.com/LM334Z-National-Semiconductor-Constant-Current/dp/B00B5LUIW8/ref=ps_luc_1_1http://www.amazon.com/LM334Z-National-Semiconductor-Constant-Current/dp/B00B5LUIW8/ref=ps_luc_1_1

5/21/2018 TDCS Gert

13/18

Energizer A23 Battery, 12 Volt 2 Pack

======================

Type 23A 12v Battery Holder

5Pcs 23A/A23 Battery (12V) Clip Holder Box Case Black

======================

470 Ohm resistor

RESISTOR 1 WATT METAL OXIDE FILM FLAMEPROOF 470 OHM 2% AXIAL LEAD 10/PKG
http://www.amazon.com/RESISTOR-METAL-OXIDE-FLAMEPROOF-AXIAL/dp/B007Z7MH3E/ref=sr_1_1?s=electronics&ie=UTF8&qid=1400600880&sr=1-1&keywords=470+ohm+resistorhttp://www.amazon.com/RESISTOR-METAL-OXIDE-FLAMEPROOF-AXIAL/dp/B007Z7MH3E/ref=sr_1_1?s=electronics&ie=UTF8&qid=1400600880&sr=1-1&keywords=470+ohm+resistorhttp://www.amazon.com/RESISTOR-METAL-OXIDE-FLAMEPROOF-AXIAL/dp/B007Z7MH3E/ref=sr_1_1?s=electronics&ie=UTF8&qid=1400600880&sr=1-1&keywords=470+ohm+resistorhttp://www.amazon.com/gp/product/B00ABRQYPM/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=ABWMN1L1DIQKHhttp://www.amazon.com/gp/product/B00ABRQYPM/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=ABWMN1L1DIQKHhttp://www.amazon.com/gp/product/B00ABRQYPM/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=ABWMN1L1DIQKHhttp://www.amazon.com/gp/product/B00004YK10/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=A19DY5EK03NIONhttp://www.amazon.com/gp/product/B00004YK10/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=A19DY5EK03NIONhttp://www.amazon.com/gp/product/B00004YK10/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=A19DY5EK03NION

5/21/2018 TDCS Gert

14/18

======================

15 Ohm resistor

RESISTOR 1 WATT METAL OXIDE FILM FLAMEPROOF 15 OHM 2% AXIAL LEAD 10/PKG

======================

100 Ohm Potentiometer

100 Ohm Linear Taper Wire-Wound Potentiometer

======================

0 3 mA Panel Meter
http://www.amazon.com/100-Linear-Taper-Wire-Wound-Potentiometer/dp/B002IABL6Chttp://www.amazon.com/100-Linear-Taper-Wire-Wound-Potentiometer/dp/B002IABL6Chttp://www.amazon.com/100-Linear-Taper-Wire-Wound-Potentiometer/dp/B002IABL6Chttp://www.amazon.com/RESISTOR-METAL-OXIDE-FLAMEPROOF-AXIAL/dp/B007Z7THNC/ref=sr_1_7?s=electronics&ie=UTF8&qid=1400600938&sr=1-7&keywords=15+ohm+resistorhttp://www.amazon.com/RESISTOR-METAL-OXIDE-FLAMEPROOF-AXIAL/dp/B007Z7THNC/ref=sr_1_7?s=electronics&ie=UTF8&qid=1400600938&sr=1-7&keywords=15+ohm+resistorhttp://www.amazon.com/RESISTOR-METAL-OXIDE-FLAMEPROOF-AXIAL/dp/B007Z7THNC/ref=sr_1_7?s=electronics&ie=UTF8&qid=1400600938&sr=1-7&keywords=15+ohm+resistor

5/21/2018 TDCS Gert

15/18

DC 3mA Analog AMP Current Panel Meter Ammeter Gauge 85C1

======================

5 or 10 mA Fast-acting Fuse

I could not find such a fuse. Do you know where I could find one?

======================

LED & Resistor pair Suggest RS 276-0209

http://www.radioshack.com/product/index.jsp?productId=2062567

Is this the correct component? It is the closest I could find, but I am not sure it is the

correct one.

======================

Momentary Contact Switch

Momentary N.O. Push Button Switch
http://www.amazon.com/Momentary-N-O-Push-Button-Switch/dp/B0002ZPB34/ref=sr_1_5?s=industrial&ie=UTF8&qid=1400599460&sr=1-5&keywords=momentary+contact+switchhttp://www.amazon.com/Momentary-N-O-Push-Button-Switch/dp/B0002ZPB34/ref=sr_1_5?s=industrial&ie=UTF8&qid=1400599460&sr=1-5&keywords=momentary+contact+switchhttp://www.radioshack.com/product/index.jsp?productId=2062567http://www.amazon.com/Analog-Current-Panel-Meter-Ammeter/dp/B006OHSZDMhttp://www.amazon.com/Analog-Current-Panel-Meter-Ammeter/dp/B006OHSZDMhttp://www.amazon.com/Analog-Current-Panel-Meter-Ammeter/dp/B006OHSZDM

5/21/2018 TDCS Gert

16/18

On Amazon, this is called Momentary N.O. Push Button Switch. Is N.O. correct?

======================

LM334

6pcs LM334Z National Semiconductor Constant Current Source IC TO-92

Here it is called LM334Z. Is the Z OK?

======================

Summary

- Could not find the 5 or 10 mA Fast-acting Fuse

- Is the momentary contact switch N.O.?

- Is LM334Z OK?

======================

Your help and review of this list would be very helpful for me and perhaps many

others who follow your blog.

Thank you.

[email protected]

JUNE 5, 2014@ 12:20 PM

More or less an Old post by now, but I hope you might answer my question

nonetheless.

I am always a bit confused with anode and cathode. Am I right, that the anode

electrode (the electrode to stimulate a certain brain area) is hooked up to the plus

terminal of the battery, whereas the cathode electrode is hooked up to the minus

terminal of the battery?

Additionally, is the LM334 a necessary element of a tDCS device? I made a test set-

up without it and according to my ammeter, the current must flow at a pretty constant

state (very small movement of the needle, if any).

I would really appreciate an answer, thank you!

B.K.

REPLY

SpeakWisdom

JUNE 7, 2014@ 1:24 PM

Yes the anode is the positive lead.

Resistor based devices (without current regulator) can be built (there is an

article on my blog about how to do it.) They can work fine if monitored.

REPLY
http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1288#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1284#respondhttp://www.amazon.com/LM334Z-National-Semiconductor-Constant-Current/dp/B00B5LUIW8/ref=sr_1_1?ie=UTF8&qid=1400599338&sr=8-1&keywords=lm334http://www.amazon.com/LM334Z-National-Semiconductor-Constant-Current/dp/B00B5LUIW8/ref=sr_1_1?ie=UTF8&qid=1400599338&sr=8-1&keywords=lm334http://www.amazon.com/LM334Z-National-Semiconductor-Constant-Current/dp/B00B5LUIW8/ref=sr_1_1?ie=UTF8&qid=1400599338&sr=8-1&keywords=lm334http://www.amazon.com/Momentary-N-O-Push-Button-Switch/dp/B0002ZPB34/ref=sr_1_5?s=industrial&ie=UTF8&qid=1400599460&sr=1-5&keywords=momentary+contact+switch

5/21/2018 TDCS Gert

17/18

Brent

[email protected]

JUNE 8, 2014@ 6:10 AM

Thanks for the c larification and information!

Steven

JUNE 18, 2014@ 5:33 AM

Hi thanks for the great work and sharing the results!

I have a question for anyone who has tried this and has more electrical knowledge

than myself: what happens if you use a 9v battery (the one i happen to have on

hand)?

I was reading up on tRNS and looking online for random noise circuits but did not find

much. Can this tDCS research device be modified for tRNS?

Thanks again everyone!

REPLY

corrado

JULY 9, 2014@ 9:53 AM

Hi SpeakWisdom;

If I have understood well, your device is a CONSTANT CURRENT one ?

What if I would emit a waveform at a particular (or regulable) frequency ?

Thanks for the suggestions and for you valuable work!

REPLY

SpeakWisdom

JULY 14, 2014@ 2:44 AM

Yes tDCS is built around current regulated DC. AC is not in my area of

reading and research. DC seems so promising havent heard of similar

success rate with variable frequency. Plus the circuit gets much more

complex.

Brent

REPLY

JL Paul

JULY 11, 2014@ 4:04 AM

Maybe a dumb question, but what kind of resistor is in between the contact test

switch and the LED light? 470?

REPLY

SpeakWisdom

JULY 14, 2014@ 2:31 AM

A 390 ohm resistor will suffice for a typical led.

Brent

REPLY

Brent

JULY 12, 2014@ 5:20 PM

HI Brent, (I am also Brent!)

What is the value of the resistor in series with the LED? Or does the LED you have

specified come with it built in? The RS specification does not say.

thanks

Brent

REPLY

SpeakWisdom

JULY 14, 2014@ 2:30 AM

It is a resistor/LED pair sold as one component just for convenience.

You could use a 390 ohm resistor in series with a typical led and get the

same result.

Brent

REPLY
http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1377#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1374#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1378#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1372#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1382#respondhttp://speakwisdom.wordpress.com/http://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1366#respondhttp://localhost/var/www/apps/conversion/tmp/scratch_1/2013/02/10/user-built-tdcs-research-device/?replytocom=1308#respond

5/21/2018 TDCS Gert

18/18

Create a free website or blog a t WordPress.com. | The iTheme2 Theme.

Greg

JULY 14, 2014@ 1:45 PM

One can also Google LED resistor calculator. One of the first search results in

led.linear1.org which asks for 3 pieces of info on the LED you plan to use. Supply

voltage (battery voltage in most cases), then the forward voltage and forward current

which are given by the LED mfg. Plug those in and it calculates the necessary

resistor.

Also found that red LED use the least amount of current so it could be better to stick

with those.

REPLY

chillgrooves

JULY 16, 2014@ 3:35 PM

Does anyone know if a pulsing square DC wave, such as from TENS unit, can do the

same job as a unit designed for tDCS, as long as the charge is correct?

REPLY

Daniel Tourigny

JULY 4, 2014@ 11:58 PM

Also, there was an earlier comment from a fellow trying to put together and he was

unable to find the right fuse. Try as I might, I cannot find one either.

REPLY

SpeakWisdom

JULY 14, 2014@ 2:48 AM

I have found them on ebay, though they seem to come and go.

Brent

REPLY

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