Problem with Denas Glasses

[Zephiloyd]

I bought 2 pairs of Denas glasses from ebay recently, to experiment with. I want to try and see if it can improve my eyesight.



After using them a few times, I felt that something wasn't quite right and I found that each alternate electrode was unconnected as I felt no signal. Intrigued, I carefully removed the rubber to see how they were wired. The wiring in the glasses was fine, it went positive, negative all the way round with each electrode. This is how I thought they would be wired but it didn't explain why there was no signal on the alternate ones. I new the problem had to be elsewhere. Half way down, the wires lead into one under a small plastic case, I carefully removed the case to expose the small circuit board onto which the wires were soldered. It was there that I found the problem.

This is an image of the circuit board they used



Its not very clear, so i have drawn the circuit board to make it easier to see:
The circuit board with no wires:



and the circuit board with wires:



As you can see, if it is wired in this way, no signal is sent along the path I have shown. That wiring method, simply sends the positive to every alternate electrode on one side of the glasses and the negative to every alternate electrode on the other side of the glasses.

I rewired the cricuit board correctly so that it now looks like this:



If you follow the wires, that set-up allows the glasses to do the job they were intended to.

I checked my other pair, and they were also wired incorrectly!
This is important and people who have bought these need to know about this.

[Benedick]

Thanks Zephiloyd,

I have checked my inventory and the same problem.

I will inform the manufacturer.

They sure work when they are wired right!

Benedick

www.benedickhoward.com

[Benedick]

Whilst I was waiting for a reply from the company I took a pair of goggles and rewired it as above to find that I did not get as good a contact or tingles.

And toady this email came in explaining the reasons (translated from the Russian)



Hello Benedick!
The electric scheme of connection of contacts according to which are made Dens-glasses, in electronics is called as "consecutive" (when 8 electrodes are connected to socket contact, and the others 8 – are connected among themselves). It is not a manufacturing error, this conscious decision of the company of the manufacturer.

The consecutive scheme of connection of contacts has both certain lack, and essential advantages: :
1.    Work only on direct appointment is provided (use only one half of "glasses" since in this case electrostimulation will not be carried out).
2.    Electrostimulation is carried out only at good contact of both halfs of "glasses".
3.    Failure of one of half of "glasses" leads to an exit of all product out of operation. Besides, can seem that it is a lack since the similar decision reduces reliability of a product, however, actually it is advantage, since the situation is excluded when electrostimulation is carried out only on one half of electrode (only on 1 eye) that is quite probable at use of the parallel scheme of connection of contacts in case of individual refusal (breakage). Medical tests passed at electrostimulation of both half of electrode, accordingly, there is no trustworthy information about potential consequences of use of electrostimulation only on 1 half of electrode.
4.   The situation of proceeding of a current between "half" of points is excluded, i.e. the current proceeds between the next contacts of one "half" of Dens-glasses. 

The lack is only  one  - the big capacity of electrostimulation, i.e., in a case when you feel electrostimulation at level of capacity N at the consecutive scheme of connection of contacts at the parallel scheme of connection of contacts – similar sensations you will feel already on level N/2. However, besides it is ambiguous "lack", since It means that you receive in 2 times more exact tincture on capacity at the consecutive scheme of inclusion of electrodes.

During the analysis of risks, taking into account the above-stated merits and demerits of this or that scheme of connection, the decision that use of the parallel scheme by manufacture is inexpedient was accepted, and is potentially unsafe. For this reason electrodes of a product "Dens-glasses" are connected under the consecutive scheme of inclusion. The persevering recommendation to correct connection of conclusions in (small plastic case) as was in the original.

Best regards/S pozdravem
Olga Soldatkina

[Zephiloyd]

Hi Benedick

When rewiring did you remember to do the short middle connection as well (a stretch of solder will do that) because I found the stimulation to be much improved.

Regarding their reply:



Not only is this complicated technology to explain,  but the current language barrier is a huge problem in its own right.

OK, so they are saying that their set up is correct, ie.

   left           right
+ 0 + 0       - 0 - 0
0 + 0 +       0 - 0 -

and the way I have rewired it means it is now like this, but is possible unsafe?

   left         right
+ - + -      + - + -
- + - +      - + - +

I wish I could understand their explanation better. Can you shed any further light?

[Benedick]

Aloha,

I have sold a number of goggles and we are having great results.  So, I for one am not changing the configuration, and remember you don't have to actually have to feel the signal for it to work.

These new goggles are way more comfortable than the old design.

Benedick