Already got the size from gauss, so the only thing left is the power supply spec pic for gauss. :+1:
THIS IS THE SMPS FOR MY OPUS 2.2 VERSION
Are you sure Gausse?! I may order one next week!
FAVOLCANO FAVOLCANO® AC 100-240V To DC 12V 5A 60W 5.5x2.1mm DC Output Jack Power Supply Converter Adapter for Led Li
$21.13,crazy,more than half of what I paid for the opus!
This OPUS thread is bringing the love back,no more bickering! 
^
OK,Thanks,I will check that out.
I did find some on Ebay for $7,seems awfully cheap………I wonder what the quality will be?
I’ve tried to make my 3400 produce the problem—it won’t do it—charging (4) 30Qs at 1amp without a hitch—-my 3100 is at my camp—I have also tried my power supply from my hobby charger 12v/ 5a —-works perfectly—these are readily available on ebay— also I’m curious if anyone has a car adapter—try it in your car on straight 12v
I just retested my 3400 with my 2a power supply—-it reset almost the instant it started charging—I’m pretty confident it’s a power supply issue—if I remember correctly the 3100 has a more rounded edge PS—where as the 3400 I have it’s square—most likely updated
Thanks,according to Gausse the one you posted has the Wrong barrel connector size.
Connecter size: 5.5mm/2.5mm
It should be 5.5mm/2.1mm??
One of you are wrong,I just ordered the 2.1mm,I hope it is the CORRECT one!!!
P.S. Mine never failed while charging 4 x 18650 @1 amp,only when I did the charge /test
Not sure what size barrel I have— it’s plastic insert is yellow—thought it might be color coded
I’ve had this 3400 for almost 2yrs—I always charge/test at 1a—— 4 at a time—-I’m talking 100s of cells from pulls to new —never had the issue you’ll are having
EDIT: my 3400 PS is the Asian Power Devices APD WA-36A12U as stated above
Were you doing it like outlined below chops???
That may be it,the APD is better. That is probably the problem.
Sorry, I may be a bit behind. I am on my phone now…… :person_facepalming:
It is a slow go to say the least…… 
I charge 4 cells at a time @ 1A often, and never had that reset happen. My power supply is plugged into a Tripp lite Isobar with line filters though. Wonder if that has anything to do with it.
Version 2.2, KYT power supply
from my calculations using all my fingers and most of my toes—roughly a shade more than a 64th bigger
Opus 3400/2.1 APD power supply
OK,The latest!
I decided to do another Charge/Test to see if it would replicate the failure from earlier today. For those not familiar, that test is CHARGE/DISCHARGE and CHARGE to get capacity results. Earlier today it failed several times when it was transitioning from the discharge phase to the charge phase. Basically reset[turned off/on again] and defaults to 500mAh instead of the 1000mah I used for the test[4 x 18650]
So,before my hike I checked the batteries and AFTER the charge[first phase] was complete,it did NOT transition to the discharge phase! I am positive I had the setting for CHARGE/TEST. The read out had charge instead of charge/test!!I have no clue as to why?!
How does that happen? Is that related to the Power supply that seems to be the consensus of the first mishap?
My amateur guess is in addition or possibly just by itself, there is an electrical component failing internally?
I do know this. I do not have the patience that a lot of you guys have.
Opus #1- I returned it because I felt it did not charge high enough[4.15v] and the discharge tests were too high!! Let it also be known that I did return the Power supply first because it got way too hot,the charger followed in a few days. That was the first indication of a power supply problem!
Opus #2[the one I have now] charges 0.03v higher and much more accurate capacity tests.
Unfortunately it has the issues that have been discussed today.I am disappointed because I was happy w/ end voltage and capacity results.
Opus #3- I can return Opus #2 and get #3. Almost certain that is what I am going to do. If that one starts to have the same issues I can use the 12v/5a power supply that I just ordered!
I am NOT convinced that the power supply is the only thing wrong with my charger.
The only way I would delay getting Opus #3 is if Jon Caserta[owner Liionwholesale] would agree to let me keep this another 10 days or so until the power supply comes and I have several days to do tests. I think he would do that.
In any event,if there is an Opus Three and it fails or this one fails after new power supply,I am finished w/ Mr. Opus and Mr. Efest LUC V4 will come out of storage and be with my 2 X FENIX-ARE and KP-L2 in my flashlight laboratory!
,those are my amateur, gut feeling thoughts mixed in w/ facts!
ok,this time I was there when it transitioned from FULL Discharge to begin charging stage.
Two minutes after discharge was complete and Charging began, it did the same thing as before. It shut off/reset and came back on default charging of 500mAh :person_facepalming:
EDIT: Right before it happened[just like last time] you could hear the fan weaken like it and the unit was losing power, then it shut off/reset and came back on.
Have you tried it with 3 cells—that way you’d know if the charger is still working or not
It charged 4 cells yesterday when I was doing the Repeat Charge/Test. It just did not start or complete the discharge test.
I will try 3 cells anyway and post results in an hour or Two. I am just going to tail stand my K40vn until its ~ 3.80v and then charge them!
OK, I could find no suitable power supply locally yesterday; so that’s out.
My laptop supply has the right plug it seems, but it is 19v/2,37a. That would be to much voltage wouldn’t it? ( 19 V )
I really don’t want to fry the thing.
Some questions/concerns assuming Jon will let me keep my Opus and test it with a new power supply AND Return it for a new one if it fails!
What will the quality be for a Power supply that was shipped for $6.99?!
Will it meet the advertised specs of 12V/5A or will it fall into the category of so many falsified capacities/specs. of numerous Chinese batteries?*Fire, ect.
No way for me to know until I get it because I have no equipment to test it!
This is just a guess! It is sold for $6.99,probably cost $1 to make, ebay guy buys it for $2 and pays $2 or$3 to ship to me and gets a $2 or $3 profit!!! :laughing: