Solid Advice on Selecting tDCS and Accessories

Introduction, the London based small business that keeps innovating in the DIY tDCS* and brain stimulation space now has a number of products in their line.  Some people are confused about which parts and pieces to buy in order to have the right stuff to move ahead with a tDCS treatment (or other) program.  I thought I could help a little with this blog post.

The V2 Brain Stimulation Device

First, you will need a V2 stimulator device. The device currently sells for about $199 and with current firmware is far beyond any of the competition in terms of versatility, capability, portability, etc. I won’t take time here to list all of the MANY things the V2 can do, but suffice it to say that manufacturers of “professional grade” tDCS, tACS, etc. equipment are probably nervous about where is driving prices and capabilities! In my opinion, the V2 is THE brain stimulation device to buy at its price point.

Note: Though the V2 can be controlled via an IOS or Android device, it’s not really necessary. The V2 on-screen display and joystick will quickly and easily let you access V2 setup and features.

(The V2. In my opinion, a great brain stimulation device.)


Next, you need electrodes. offers FOUR different electrode options for you to choose from:

Option 1: The Gamer Headset.

(The Gamer headset with sponges removed. Sponge holders can be separated from the metal band for added versatility.)

This is probably the best choice for most stimulation (tDCS) situations. It consists of two sponge electrodes mounted on a flexible band. The electrode “holders” can bend inward to place the electrodes properly on the forehead. HOWEVER, I find it best to remove the electrode holders from the band and use an elastic headband to position the electrode sponges as desired.  The Gamer headset does NOT restrict electrode placement – you just need to add your own elastic band.

(Look closely at this pic and you will see the Gamer electrode holders have been removed from the included metal band. Instead they are placed on my test head using an elastic band – in this case for the savant montage.)

Option 2: The EDGE Headset.

This option should ONLY be selected IF you are interested in researching brain stimulation and its possible impact of athletic performance. This is a special-purpose (not general purpose) headset. The electrode placements are unusual and will not address the needs of most tDCS users.

(The EDGE headset showing the main electrode at the top and the secondary electrode that would be attached to the upper arm at the bottom. This is a special purpose brain stimulation headset.)

Option 3: Moovs Stick-on Gel Electrodes

This is a new option from It is a pair of electrodes that adhere to open areas of skin (NOT HAIR or through hair.) Because of this, they are a bit limited in terms of where they can be placed. They are light and very comfortable – and do stick to skin well. But if part of your treatment montage involves placing electrodes over hair – you should select the GAMER sponge headset (or option 4 below) instead. Remember, the Gamer electrodes can be placed anywhere with an elastic band.

(The Moovs stick-on electrodes. Image from the website.)

Option 4: Your Own Electrodes

I and many other brain stimulation researchers and testers have been very pleased with the line of sponge electrodes from Amrex. Most of us use the 3×3 Amrex, but sometimes the smaller 2×2 is useful.  The Amrex sponge electrodes are not cheap, but they are built to last. to their credit makes it EASY to use your own electrodes, whatever you prefer, via a simple adapter cable (about $10 from The cable allows you to plug in “TENS” compatible connecting wires, including those that have banana plugs for the Amrex electrodes. You can buy electrodes, wires, and more at almost any medical supply house – and via Amazon!

(The Amrex 3×3 is shown. It consists of a rubber shell, stainless wire screen, and a sponge. Connection is via a banana plug to a jack at the top of the electrode.)


The V2 represents the best capability I am aware of for DIY tDCS (and brain stimulation) users. Yes, there are many less expensive devices (tDCS) in the market and they are appropriate for those on limited budgets, just starting out with tDCS, etc. But if you want the most capability for your future brain stimulation needs, I don’t know of a better product in the market right now. Remember, you will need a V2 and electrodes.  If you buy it all from you will spend around $300.  If you choose to use your own electrodes (and connecting wires), you can spend a little less (total.)


As I have mentioned, is a SMALL company based in London doing incredibly innovative work in the field of brain stimulation technology – with a focus (pardon the pun) on the DIY marketplace (not the multi-million dollar grant driven labs.) I believe they have become somewhat overwhelmed by their own success. So YOU may encounter slow service on any special request you make of (tech support, returns, etc.)  Be prepared to be patient. The web site also is overly complicated by its attempts to be trendy. I suggest you hit the “All Products” link at the top left as a starting point.

By the way, will not diagnose or prescribe treatment for you – so don’t be upset if they ignore such requests. Do your homework on tDCS (brain stimulation), become informed, and make your own carefully considered decisions about brain stimulation and its appropriateness for your situation.

See the following for more information on tDCS:

*tDCS is transcranial direct current stimulation

Powerful, fast, versatile tablets for about $100


Most of what I blog about has to do with transcranial direct current stimulation (tDCS) – see link at the top). But now and then, I take a tangent when I think the time is right.  This is such an occasion.

(Dragon Touch A1X. Image from TE.)

Most everyone, these days, is familiar with iPads from Apple and an assortment of various brand Android tablets now in the market.  Most “branded” tablets are priced in the $200-$600 range, depending on screen size and other features. But an interesting “niche” has recently appeared that makes it possible to own a really NICE tablet for $99-$120!  Really?! …and don’t be afraid of Android – it has become as easy to use as iOS – anyone can figure it out in minutes.

Amazing Tablets for Little $$

A company by the name of Tablet Express, via, is currently offering two “Dragon Touch” Android tablets, manufactured in China, that certainly deserve a look – particularly if you are seeking a second tablet or supplemental computing device.

I purchased two of the Dragon Touch A1X (gave one away) and one of the Dragon Touch X10 tablets.  Their quality and performance, particularly the X10, is very pleasantly surprising! I won’t bore you with a bunch of specifications, but here are some basics:

  • A1X: quad core, N wifi, 16GB flash, 1024×600 10.1 inch display, approx. $99
  • X10: 8 core, N wifi, 16GB flash, 1366×768 10.6 inch display, approx. $119

For more details, see

My Comments

The A1X is a light, fast tablet that is excellent for on-the-go use. It will run all day on a charge and runs very nicely all of the Android apps I’ve installed on it from the Play Store – including the Amazon video player.  The display is bright and reasonably readable in sunlight (I’ve seen better and worse on other tablets.) I think the A1X is a great general-purpose tablet suitable for word-processing, playing music and games, and watching videos.

(Dragon Touch A1X. Thin, light, fast! Image from TE.)

The X10 is SHOCKING! It has a BEAUTIFUL display and is FAST. It is slightly larger than the A1X, but it’s higher resolution display is not quite as bright as the A1X (so not as good in sunlight.) But if you want a display that will knock-your-socks-off with sharpness, color, and overall quality, the X10 is the way to go.  For watching movies it is AWESOME.

(The Dragon Touch X10. Very fast, beautiful screen! Image from TE.)

A Caution

Neither tablet seems to use Gorilla glass or equivalent in the screen-build.  That means the screen is a bit on the fragile side. A screen protector is a MUST and keeping either tablet in a case is a smart idea.  Amazon sells appropriate screen protectors and cases for both models for a total of about $18. These are probably not the tablets to put into the hands of a 1st grader (or middle-schooler for that matter!)

I must also tell you that I experienced some problem with initial quality with both tablets.  The first two A1X’s I received arrived with defective (scratched/cracked) screens. My first X10 tablet died after two days of use.  The good news is that Tablet Express and Amazon backed the tablets and quickly supplied replacements.  To me, given the features and capabilities of these tablets – coupled with a very low price – the risk is very worthwhile.


Wow! Need a tablet? Don’t want to spend much money for a REALLY amazing tablet? I think you should take a look at the A1X and the X10. Enjoy!

Oh, by the way, to prevent Android malware from becoming a problem on your Android device, may I suggest you install Malwarebytes from the Play Store.  It’s free and provides very worthwhile protection.

Just in Time for Back to School! Super Specific Devices tDCS!


It’s been a very busy summer and I’m long overdue in writing a review of Super Specific Devices (SSD) line of tDCS* equipment targeting the DIY marketplace.  SSD has been quietly building some high-quality gear for several months now and their various models deserve a good look.

(The SSD Voltage Selectable tDCS Device)

The Basics

Let’s start with the basic unit – on the SSD website, you choose a unit powered by either a 9 or 12 volt battery and an analog or digital meter.

The tDCS circuit is a simple but reliable LM type current regulator with the added safety bonus of in-circuit current limiting diodes.  All components are nicely soldered to a PC board and all connections to that board are secured with glue.  SSD has chosen to build their tDCS devices into a nicely made and finished wood box – it has a more professional appearance than do many of the tDCS devices on the market today. Electrodes are connected to the device via a small “TENS” style connector on the side of the unit.

(Inside the 12 volt version of the SSD tDCS device is simple and neat. The type 23A battery can be seen to the right and the current regulator board is to the top left of the box. Approx $115)

All units are supplied with a starter set of lead-wires, non-stick electrodes, sponges, and self-adhering tape (rather than a headband).  If you are really serious about tDCS, you might want to consider the accessory banana plug adapter cord for use with Amrex and similar sponge electrodes (about $10).



(Operation is simple! Start with the unit turned off and the dial rotated fully counter-clockwise. Place wetted sponge electrodes as desired, turn on the unit, and adjust current to desired level. Run session for planned treatment time and at completion, rotate the dial fully counter-clockwise and turn the unit off.)

The SSD Voltage Selectable tDCS Device

Super Specific Devices also offers a new tDCS device that provides switch-selectable 9, 12, and 18 volt settings. The selectable voltage range helps deal with difficult electrode setups (like one electrode placed on the shoulder or arm, or stick-on electrodes) where a 9 volt tDCS device may not be able to overcome the higher resistance to deliver the desired current level. The ability to switch to 12 or 18 volts may make all the difference in reaching a desired treatment current level.

(The inside of the voltage selectable tDCS device is obviously more congested. A 9 volt battery powers the analog meter unit with the voltage boost circuit at the bottom left and the regulator circuit at the top center of the box.  The selector switch is at the very top left of this photo. The wiring looks more ominous than it really is. Much of the wire is related to selecting voltage and illuminating the tri-color LED appropriately. With so much point-to-point wiring, careful soldering and quality checks are a must though.)

The circuit in the voltage selectable units is again built around an LM current regulator with current limiting diode backup so maximum current cannot exceed 2.5 mA.  Interestingly the digital display version of the voltage selectable unit is USB rechargeable! According to the SSD web site, the device is switch protected so that USB energy cannot be used during a tDCS session.  This is a wise safety feature. The use of rechargeable batteries (rather than throw-away) and USB charging might be a good trend for all tDCS manufacturers to follow – just adopt the practice of isolating charging from operation as SSD has done!

(From the SSD web site. The voltage selectable, digital display, USB charging version. Approx $175)

My Testing

I have tested the 12 volt version (analog meter) and the voltage selectable version (analog meter) from Super Specific Devices and like them very much. They are solidly built using a tried and tested tDCS device design and are likely to provide reliable service for years.  Given the low price of SSD units, I can’t imagine an individual going to the trouble to find all the components and taking the time to build tDCS device(s) with this level of construction.  Time would be better spent buying and using the SSD device!

I subjected each of the SSD devices I have on hand to my usual torture and use tests. In every case, the units delivered the current level specified. In my simulated failure modes, I was never able to exceed 2.5 mA output current.

As with most tDCS vendors servicing the DIY market, SSD does not provide medical advice (diagnosis, treatment recommendations, etc.) The instructions they provide with each unit are complete in the sense of learning how to operate the supplied unit.  However, each customer is expected to seek out other sources for information on tDCS, what is possible, and treatment montages.

Final Comments

I continue to be pleased to see a wide variety of capable tDCS devices available to the public from a number of vendors.  Units span a wide range from simple and cheap to more expensive and very sophisticated.  Super Specific Devices seems to have found a niche in the middle with products that have a low price but a quality build, nice appearance, and solid features.

Super Specific Devices web site:

*tDCS is transcranial direct current stimulation




Apex Type A tDCS Device Review


I am so pleased that an assortment of excellent tDCS* devices is now reaching the market – making the benefits of tDCS available to more and more people worldwide.  The range of devices is impressive – from simple and cheap to expensive and very sophisticated.

I won’t take the time or space here to detail all the potential benefits of tDCS or why you should consider obtaining a device – but suffice it to say that millions of people could dramatically improve their lives with tDCS. tDCS can be used to treat depression, chronic pain, enhance memory, and much more.  See the web sites I list below as a good starting point for more information on tDCS.

(Apex Type A Main Unit)

The Apex Type A

The Apex type A “Adjustable Direct Current Generator” is a low priced but well-built device that uses a classic tDCS design that includes a 9 volt battery, an LM334 current regulator, a programming resistor to limit delivered current to about 2 mA and a meter to monitor current delivered.  This design (and variations) have been used by do-it-yourselfers for years (I’ve built several myself) and has proven to be very reliable, simple, and safe.

Apex saves you the considerable time and trouble to locate all the parts to build your own device by manufacturing a solid unit that looks like it will last for many years. The base unit alone sells for about $99 and a complete kit including head-band, electrodes, wires, etc. is about $139 (plus shipping).

Apex kit
(Apex Type A and accessories – from the web site)

As with most other tDCS device manufacturers, Apex does not provide medical advice, information about which tDCS electrode placements will work for you, etc. They leave it up to you to do your homework by reading the considerable about of material available online (see example links below) to decide if tDCS is right for you and what treatment method will work best.

The Apex Type A comes with a well written user guide that takes the user step-by-step through installing a 9 volt battery, connecting wires and electrodes, and running a simple test to see that the unit is working as it should.  There are two controls and two indicators on the type A:

  • On-off switch: clearly marked
  • Current adjustment dial: clockwise rotation raises current, the opposite to reduce current
  • Indicator LED: glows blue when the unit is turned on
  • Meter: I consider this almost a must-have in a consumer tDCS device. It clearly shows the amount of current being delivered during a tDCS session.

It’s also worth noting that the Apex Type A allows for the simultaneous connection of two sets of electrodes. Most users would rarely if ever do this – and it’s important to remember that device output current (max 2 mA) will divide between the sets of electrodes (probably not evenly – due to different resistance through the head at different locations.)

Testing and Use

As I mentioned above, I’m very familiar with the classic design of the Apex Type A and can say that the device performed exactly as expected – delivering a clean, DC current at a maximum of 2 mA (depending on dial setting.)


As you can see from the photos of the inside of the unit, build quality is very high.  All solder joints are well-made and clean, and mechanical attachment of the circuit board, controls, etc. is very solid. Some may object to the use of hand-assembly / perf-board instead of machine assembly / printed circuit board – and I might too except that the electronics of this classic design are very simple and as you can see involve only six solder joints on the circuit board itself.  As long as Apex continues good quality control and inspection procedures, this method of construction is perfectly fine.

(Construction is simple and solid.)

(Assembly is neat and well done.

Is 9 Volts Enough?

As far as a tDCS device is concerned, a human head is nothing but a big, liquid filled resistor. All the device does is try its best to deliver a consistent, stable one to two milliamps to cause the desired treatment effect.  9 volts is about the minimum that can reliably deliver the desired current level given circuit, hair, skin, etc. resistance that does it’s best to limit current flow.  Many commercial tDCS devices use 12 or 18 volts – some go as high as 80 volts! The higher voltages make it easier to overcome higher resistance (for example if one electrode is on the forehead and one on the shoulder). But the higher the voltage, the more opportunity there is for a painful (if not dangerous) experience if something goes wrong.  So many of the simpler tDCS devices elect to use a single 9 volt battery (or sometimes two in series).

Given the low voltage of the Apex Type A, it is very important that you do at least the following to make sure your treatment current is as you select:

  1. Use saline water and sponge electrodes (you can make your own saline and sponge electrodes if you like)
  2. Get the sponges really wet, then squeeze them out a bit (you don’t want water dripping down your head)
  3. Use a good head-band. Your head-band will need to be tight – not uncomfortably so, but tight

(Controls are simple and work well. This is a Type A set for maximum current, with a new battery and shorted anode and cathode leads. Note the maximum current of about 2 mA.)

When you start a tDCS session, expect current to rise slowly (over two or three minutes) as your scalp or skin gets wetter. You may find it desirable to adjust the current control on the Apex Type A once or twice during your tDCS session.


Apex does a nice job of providing a simple, reliable, well-built tDCS device that will do exactly what it is supposed to do – provide clean 1 to 2 mA DC for your tDCS application. They provide good operation instructions with the device and have a wide array of backup material on their web site. Well done Apex!


*tDCS is transcranial direct current stimulation

Time to Take Another Look At tDCS and more


About two years ago burst on the do-it-yourself tDCS scene with a headset marketed to “gamers” – claiming to offer improved game performance (higher scores).  A few folks like myself recognized the headset (V1) for what it was – a remarkable, capable tDCS device that could be used for ANY tDCS related purpose including treating depression, chronic pain, enhancing memory, etc. – and yes, improving game scores!  The V1 headset was truly a leap beyond anything else available to the DIY community offering an all-in-one headset that could be controlled via Bluetooth, offered built-on and external electrodes, all in a very nicely designed package.

(Famous or infamous V1 ad campaign)

Critics quickly emerged, as they often do, describing customer relations related problems with – many justified, and technical issues with the product – many unjustified.  It seemed was surprised by their own success and unprepared for the order volume and normal support requirements of such a leading edge product. By the time got its organizational problems resolved, the V1 was winding down and the company was preparing to launch the V2.

The V2

Several months ago, Transcranial Ltd. launched it’s new tDCS product, the V2. It, like the V1, sets a  high bar for the DIY tDCS market. In a tiny package easily small enough to misplace with your car-keys, engineers included all of the technical features of the V1, plus the added versatility of upgradeable firmware (new features), display screen with scrollable selection, redesigned and industry leading headsets, the ability to use 3rd party headsets and related accessories, and more!

(The V2. Tiny! Awesome!)

Interestingly, via their advertising, now seems to recognize the value of their technology for what it is, a real cranial stimulation device – not just for gamers – but for anyone seeking the benefits of tDCS and more.

The V2 ad campaign is more general – making clearer the broad capabilities of the V2.)

Since my initial posting about the V2 (see ) Transcranial Ltd. has upgraded the feature set of the V2 in significant ways!  The V2 now supports tDCS, tACS, tPCS, and tRNS as well an upgraded application for Android devices and soon iOS. The V2 can no longer be referred to as just a tDCS device – it’s now a fully capable, research grade, cranial stimulation device!

It’s a Software World Now!

If you purchase a V2 (or own one now), you may wish to update its firmware periodically to take advantage of new features.  Here are some key steps:

  1. Go to the web site and create an account:
  2. Log in with the account
  3. Connect your V2 doc to your capable PC (or Mac)
  4. On the left of your screen (once logged in), select “My Downloadable Products”
  5. Click the “Microsoft Software” (or Mac) download button and install
  6. Run the installed application and allow it to check and upgrade your V2 to the latest firmware


An Android app is available (search for wave tdcs in the store.) An iOS app for the V2 is due anytime (the old V1 app does not seem to work with the current V2 firmware.) I will say that the on-screen display of the V2 is so good and so versatile that I’m not convinced that the apps currently add much value. Transcranial Ltd. is soon to release a EEG capability called “Quantum” that will apparently link to the V2 – and will probably make the apps very functional and important to use.

( Android app)

Anyway, you must pair the device to your Android or iOS device to use an app. Here are normal pairing procedures:

  1. Make sure Bluetooth is turned on on your Android or iOS device
  2. Turn on the V2 and scroll to Settings, Bluetooth, and make sure Bluetooth is On.
  3. Very quickly your handheld device should find the device and request you type in a code number that you will find displayed on the device. Do that and you are ready to go!
  4. Run the app, set the desired mode (tDCS, etc.), max voltage (20 is typically fine), current (1 to 2 mA), time (typically 20-25 minutes), sham should be off, and START

I’ve noticed that the Android app does not display remaining session time.  You can see it easily on the device by tapping the blue joystick.

More Detailed Instructions?

Like most tDCS vendors, Transcranial Ltd. is trying to stay off of the FDA’s radar by making it clear that they are not producing a medical device – so they shy away from writing application guides and notes. This frustrates some. Users are left to their own creativity to learn how to properly use and get full advantage from a device (V1 or V2). To help V1 headset users, I wrote a pretty detailed set of instructions ( see ) that seem to be popular.  Would you like an equally detailed set of instructions for the V2? Let me know – if there is sufficient interest I’ll be happy to put that together.

Finally, I’ve taken a good bit of heat via email and blogs for being a fan of Unlike some, I saw very early on that their unique product(s), if used correctly, could be used to improve the lives of many – and that has turned out to be true. continues to be one of my favorites in the world of tDCS and cranial stimulation and I, for one, anxiously await their next DIY leading-edge products and the pace they set for the industry.

I look forward to your comments and questions.


1. Photos in this blog are from the internet and include images from and speakwisdom
2. If you are new to tDCS, please read and study carefully before taking any action related to tDCS or any cranial stimulation technology.  I suggest as a starting point:
d. (search for tDCS)

Summer is Here! Time for The Brain Stimulator Travel Model!

Travel Model Advanced 2x2 Kit - Unplugged_NEW
(The Brain Stimulator Travel Model shown with available electrodes, wires, and headband. The tDCS module itself is very small and easy to transport.)

I am a longtime fan and proponent of tDCS.  There is plenty of evidence that this simple, safe, technology can be used to reduce or eliminate depression, treat chronic pain (including migraine headaches), enhance memory and learning, and more!  If you are new to tDCS, take a look at the index of tDCS articles I’ve posted at

If you are looking for a high quality tDCS device that also happens to be ideal for summer travel, you should consider “The Brain Stimulator Travel Model”.  This is a well-built, basic, tDCS device that can deliver 1 or 2 mA with the flick of a switch and can stand-up to being repeatedly tossed into a suit-case or travel bag, jostled around, and still come out ready to go and deliver a reliable tDCS session.  Depending on the configuration you buy, it can cost as little as $55 – or a bit more with high quality electrodes and other accessories.

The Brain Stimulator Travel Model also makes an excellent first tDCS device or a supplemental device if you already own something more sophisticated.  It is built by JD Leadam and his team at Neurolectrics – real pioneers in the DIY tDCS marketplace.


(The packaging of the devices is simple, neat, and able to withstand travel related abuse.)

Neurolectics used a tried and true design built around a current regulator and a 9 volt battery. It’s simple, safe, and reliable – but because a 9 volt battery is used as its energy source, it is very important that sponge-electrodes be used and that they be well wetted with a saline solution in order to assure delivery of 1 or 2 mA (depending on switch setting).

I always prefer that a DIY tDCS device have some monitoring capability (digital or analog meter) to assure that the desired current level is being delivered. Neurolectrics chose not to take that path with this device – I assume to keep cost at a minimum and the package as small as possible.  If you are a frequent tDCS user, I’d suggest changing the 9 volt battery every couple of months – and again – be sure to use well wetted sponge electrodes to help assure you receive the selected stimulation level.

(Neurolectrics places all significant components on a nicely manufactured PC board. This limits point-to-point wiring and makes for a more reliable device – important for a travel device.)

The Brain Stimulator Travel Model could not be easier to use!  Simply wet the electrode sponges, place the electrodes as desired with a headband, flip the switch to 1 or 2 mA, and begin timing your tDCS session (20 to 25 minutes is typical.) When done, switch off the device, take off and stow the electrodes and you are done.  If you really are traveling with the device, I suggest you remove the sponges from the electrode shells and place them in a small water-tight container.  You should also wash them frequently with good soap and plenty of water to prevent anything undesirable from growing in them!

I’ve taken several trips (including through airports and airport security) with the The Brain Stimulator Travel Model and found it to be quite handy for personal use and for demonstrating tDCS as seminars.  Don’t expect any flashing lights or fancy meter with this unit.  It’s basic tDCS – and it works.

Visit the Neurolectics website at

I welcome your comments and questions.




Interview: JD Leadam, Neurolectrics

Here’s a chance to meet the founder and CEO of Neurolectrics – the creator of the BrainStimulator and the BrainStimulator Travel Model.  JD is a true pioneer in the DIY tDCS field and I hope you will find this podcast to be interesting and informative.

Click HERE to listen or download the mp3.  Total length is about 27 minutes, 12.5 MB

JD’s web site is HERE


Travel Model Advanced 2x2 Kit - Unplugged_NEW

Using the V2 with the Gamer or Your Own Electrodes


In part 1 of my series on the new V2 tDCS device, I introduced the basic components of the V2 as well as its user interface. I continue to be pleased with the V2 as a user and want to pass along some ideas related to electrode use.

The Gamer Headset offers two headsets for the V2, the Edge and the Gamer. The EDGE is a special purpose headset designed to facilitate experimentation and research on the use of tDCS to improve athletic ability. As I mentioned in the last post, this is an area of tDCS that is ripe for exploration. A few studies have already been posted that hint at possible uses for tDCS and improvements in physical ability. This will be a very interesting application of tDCS to watch as results from various tests are posted. The EDGE headset is not a general-purpose tDCS headset and should NOT be selected by most users.

The GAMER headset is a more versatile headset for the new or experienced tDCS user. It is made up of a flexible metal band and two electrodes that attach to the band. It is highly adjustable for head-size and comfort. “Out of the box” it is designed to allow stimulation of the pre-frontal cortex, an area associated with memory, learning, etc. It happens that the electrodes of the GAMER can be used independent of the included band – allowing electrode positioning for “savant learning”, treatment of chronic pain, depression, etc. Note: the electrode plainly marked “Left” on the inside of the sponge frame is the anode (+) and the electrode marked “Right” is the cathode (-).

(The Gamer headset.  Best choice for most.)

(The Gamer headset in its case.)


(The Gamer on my “test head”. Note electrodes are positions over the pre-frontal area.)

(You can use the Gamer electrodes without the supplied metal band and place them where you want. Here I’ve used an elastic band to position the electrodes for “savant learning”.)

(Here is another example with the electrodes positioned to treat chronic pain. In this example, the cathode would be placed on the upper arm or shoulder with another band.)

UPDATE – March 2015 has updated the firmware on the V2 so that the resistor that tells the tDCS module which headset is connected is no longer needed.  FURTHER – they are also released a patch cable to make attaching 3rd party electrodes even easier. See ( ).  The text below is left for historical reference only.

Using Your Own Electrodes (Amrex)

If you are pretty good with a soldering iron you can easily adapt any electrodes you prefer for use with the V2. The jack on the V2 tDCS device is a four conductor, 2.5 mm type that has been used on some cell-phones and portable audio gear. Connect your electrodes to a four conductor, 2.5 mm plug and a small resistor and away you go!

Plug Wiring

Tip and Ring 1 – a resistor across these two tells the tDCS device the model of headset connected. (300 ohms for the Edge, and 2,000 ohms for the Gamer by my measurements)
Ring 2 – Cathode connection (-)
Ring 3 – Anode connection (+)

To test this, I used a small RadioShack proto-board and broke out the 4 conductors for easy investigation and tinkering. I used a 100 and 200 ohm resistor in series to get the 300 ohms needed to let the V2 “think” I am connecting an Edge headset, even though I use popular Amrex 3x3s. Actually it seems not to matter whether the V2 thinks an Edge or Gamer is connected – you can still set all the desired tDCS treatment times and current levels.

(Note the four conductor plug. It is broken out on the proto-board with T, 1, 2, 3 as described above. I use this example with Amrex 3×3 electrodes.)

Perhaps in future firmware, will include special features for 3rd party headsets that use a different resistance identifier.
BTW Soldering wires to a four conductor, 2.5 mm plug is not for the faint of heart. It’s very easy to short contacts and generally make a mess. I suggest buying a pre-wired 2.5 mm plug from Parts Express (or similar). Their part number is 090-504.


So there you have it. I suggest that you either buy the GAMER headset with your V2 and use it as is or with your own headband as I have shown above – or do your own thing with a 4 conductor plug and whatever electrodes you prefer.

Please feel free to send along comments and suggestions related to this post or a future one you would like to see.

The NEW V2 tDCS Device and Headsets, Part 1

(The tiny V2 module is now the core of the tDCS product line.)


Once again, has distanced itself from the rest of the tDCS device pack. If you are in the market for an innovative tDCS device that is sophisticated and simple to use, I think you will be very pleased with the V2. tDCS is all about delivering a tiny current to the brain in order to improve it or provide relief from a brain-related condition. Here is a way to do it with a cool device that works well!


The first headset moved the bar on tDCS devices by offering a huge feature set (built-on or external electrodes, wearable, Bluetooth support, iOS app, etc.), and a moderate price. I don’t have any sales data on the V1 headset, but I’ll guess sold more than a few.  I happen to own more than one and use them often. I’ve also helped many others achieve tDCS success with the v1.

(The V1. Slick. Innovative.)

As a radically new design from a brand-new start-up, the V1 was not without its problems or detractors. There were production problems, support problems, unpolished features and more – that for some made it hard to see the real core value of the headset as a tDCS treatment device. But given how far pushed the DIY tDCS market, those of us who really learned how to use the headset were (and are) thrilled to have it.

The V2 did not stand still though. Based on experience with the v1, user input, and their own vision of what tDCS could become, the v2 tDCS device and accessories have been created and are now moving toward distribution.  The new device has three basic parts of which the buyer can purchase as desired.

  1. V2 tDCS Device – REQUIRED (does the work of producing the tiny DC current used in tDCS.)
  2. Gamer Headset (plugs into the V2 device. Electrodes positioned for stimulating certain types of learning)
  3. EDGE Headset (Plugs into the V2 device. Electrodes positioned to possibly enhance athletic performance.)

The V2 tDCS device itself is now a tiny module not much bigger than some USB flash-keys.  It is programmable, has a graphical display, a joy-stick like control for selection of desired tDCS parameters, and is rechargeable and updateable (firmware) via a USB base.

(As expected from, innovative design and nice packaging.)

The Gamer headset is a flexible band with two electrodes designed to reach the pre-frontal cortex area of the brain – an area thought to respond nicely to tDCS for improvement in some types of thinking and learning (concentration, planning, judgment, etc.)

(The new Gamer headset. Bigger sponges, very comfortable. Shown on my “test head”. There are better photos at

The EDGE headset represents new ground for a commercial tDCS device.  Many of us have wondered how long it would take the world of athletics to discover tDCS and the potential it holds for improving performance in many competitive and non-competitive sports.  To that end, offers the EDGE headset designed to place the anode in the area of the premotor cortex (coordinates complex movements) and the cathode on the upper arm.  Much research and experimentation in this realm of tDCS is needed, but suffice it to say that one day the top performers on your favorite sports team may be using tDCS during at least some of their training.

( calls attention to the possibilities for athletic improvements via tDCS and the EDGE headset. Shown on my test head. headset sponge-sockets are now nickel plated – instead of copper as in the v1. Better images are at


I was fortunate enough to have received a V2 at the beginning of December, 2014, with an early firmware and feature set. Suffice it to say that, even in its early form, it performs well and is very easy to use.

Using the V2 is simple: Unpack the V2 tDCS device and place it on the USB charger for an hour or two to fully charge. Meanwhile, remove two sponges from the sealed envelope supplied with your headset, wet them a bit (saline if you prefer), and place them in the sponge sockets (or use your own electrodes and headband as described in the next blog post.)

With the headset in place and plugged into the V2 device, press the blue joystick on the v2 tDCS device to activate it.  Then simply step through the prompts to setup your tDCS session parameters.

(The display is easy to read. Duration and current are easily changed.)

Your tDCS session will begin with a short ramp-up time and then a count-down of the session time remaining. Actual current delivered is displayed and graphed.  You can press on the joystick at any time to immediately end a session.

(Prompts are simple and clear.)

For you techie folks: Note that the V2 does contain a boost circuit to overcome electrode and skin resistance – as do many commercial tDCS devices.  I measured a peak of 56 volts as the V2 tried to compensate for my high-impedance load test and deliver the selected current level.  At no time was I ever able to exceed the current level I had programmed on the V2 device.

A Few of the Many Enhancements Over the V1

  1. Very small, portable, tDCS device. You could easily Velcro it into your cap or just put it in your pocket. It is easily programmed for desired tDCS settings.
  2. electrode sponges are much larger (and better quality) than with the v1 for better current distribution
  3. More comfortable headsets
  4. Can be used with, 3rd party, or user provided headsets and electrodes


  1. Three or four tDCS sessions seems sufficient to drain the battery in the early production device. I think it will be a good habit to put the V2 device on its charger when not in use.
  2. There were complaints that seemed overwhelmed when the v1 was released about two years ago – leading to spotty technical support and order-issue resolution problems. Has learned from the V1 experience?
  3. The V1 IOS app never seemed to reach a solid feature completion. It works – but… Will the V2 app be better? says it will.  They have a new programming team and will release a new app for the V1 and V2 in the January/February timeframe.  But to be clear, you DO NOT need an app to use the V2 very effectively.

Overall Impressions

I’m very pleased with my early copy of the V2.  It works well, is tiny, easy to use, and produces clean, predictable output.  The new headsets are innovative and comfortable. The V2 represents a nice step forward for and for the DIY tDCS community. I look forward to continued development of the V2, firmware, apps, and 3rd party add-ons that are likely to come.


Pricing is about the same as with the V1 (it was about $250 plus $50 for a needed accessory kit.) The V2 is $199 for the tDCS module. supplied headsets are priced at $99.  A pack of 12 sponges is $5. You are free to use 3rd party or your own electrodes if you prefer (details in my next post.) See for ordering details.

Bottom Line

The V2 is clearly more sophisticated and better designed than the typical tDCS device in the market right now.  Yes, it costs more than entry-level devices – but as the saying goes, “you get what you pay for”.  If you are serious about tDCS for yourself or someone you know, the V2 deserves your consideration.

Brent Williams, PhD

Coming at

Over the next weeks and months, I’ll post a number of articles about the V2, use, applications, and more.  Feel free to contact me with your questions and comments via

(My crude but effective breakout of the new V2 four conductor plug. Yes, you can use Amrex and other electrodes.)