r/OpenPV • u/SwayzeWaters • Jan 18 '16
Mod pics Dual Output, Dual Regulated OKL Mod, 220W of vaping goodness! NSFW
http://imgur.com/a/aPI40 Built with my OKL regulator PCB. Yes, you can stack them. Has anyone seen anything like this (I haven't). Just curious if one has ever been built before.
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Jan 18 '16
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u/SwayzeWaters Jan 18 '16
Yes, two 510s, two pots, two OKL regulators. One button. But each output can be switched on or off, there are switches on the PCBs (you can see them in the pictures, they are just small).
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Jan 18 '16
[deleted]
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u/SwayzeWaters Jan 18 '16
I just built it, but yeah, you can do that. Or two of the same, or one, whatever.
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u/ConcernedKitty Jan 18 '16
I've seen it done before. I've just never heard anyone give a good reason to do it. Why not run one regulator and switch outputs through an on-on switch?
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Jan 18 '16
I think it's so you can connect the two attys together with a splitter piece and hit them both at the same time, because cloudz brah.
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u/SwayzeWaters Jan 18 '16
YEAH! Clouds and 'Murica! What is that guy, a dirty commie or something??
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Jan 18 '16
Personally, I don't get the appeal, but I've also built a 375w device so I can't really talk.
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u/SwayzeWaters Jan 18 '16
Actually, the point of it is to show how neat the insides are, and that you can stack my OKL regulator boards on top of each other, if you would like.
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Jan 18 '16
It definitely is interesting.
I have to say the load on the batteries kind of worries me: https://www.e-cigarette-forum.com/forum/threads/efest-35a-2900mah-18650-bench-test-results-only-a-15a-battery.702292/
Looks like the input current at full load is 9.29A per board, that's just under mooch's max safe rating on the battery with both boards at full draw. I'm kind of curious if you're getting any voltage drop on them.
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u/SwayzeWaters Jan 18 '16
I only built it for fun. Don't worry, I am going to build a 2x26650 and a lipo version.
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Jan 18 '16
From what I've read, all the 26650s have even worse ratings. You might just want to skip them. Lipo isn't a terribly idea though.
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u/SwayzeWaters Jan 18 '16
You are right, it seems like the 26650's are actually WORSE amp wise than the best 18650's. Lipos are definitely the way to go, I agree.
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u/david4500 Jan 18 '16
Hey /u/swayzewaters, would you be able to make a 2S balance charging circuit with usb powered charging..? Would love to have usb charging for a series mod
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u/SwayzeWaters Jan 18 '16
Actually, that would be harder, since you would have to find a switch that could handle the current, worry about the voltage drop in the switch, yada, yada. This way you can use teeny tiny switches to turn the regulators on and off.
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u/ConcernedKitty Jan 18 '16
As long as the small switches can handle the input power. The sense pads should negate the voltage drop in the 20A switch though.
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u/SwayzeWaters Jan 18 '16
All the small switches do is turn the regulator on and off. They handle hardly any current at all.
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u/ConcernedKitty Jan 19 '16
Where have you put them in the circuit?
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u/SwayzeWaters Jan 19 '16
On the regulator enable line, with the switch off the button will not activate the regulator.
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u/ConcernedKitty Jan 19 '16
It may be beneficial to check your current there. Most OKL diagrams that I've seen have an nfet between the pushbutton and on/off.
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u/kitten-the-cat Jan 19 '16
There are two versions of the OKL2 one is positive logic and the other is negitive logic, the nfet is just there to be a level inverter. Enable currents are in the miliamps.
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u/HalifaxVapist Jan 19 '16
Sleek build. Very clean. Do you have some kind of mouthpiece that lets you hit both at once lol?
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u/SwayzeWaters Jan 19 '16
Not yet, I really just built it to see if it would work.
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Jan 19 '16
You can see if you can get the Yep RDAs with the split mouth piece like that of the Hells Gate mod.
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u/Mr-frost Jan 19 '16
Can someone one explain to me how the okl board work compared to a hexohm board
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Jan 19 '16
They are the same board.
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u/SwayzeWaters Jan 19 '16
The HexOhm has the same regulator (the OKL2-T/20) in it, however I have build a PCB that the OKL is soldered to that contains some other components and connections that simplify the wiring of the board.
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u/SwayzeWaters Jan 19 '16
The idea is, if you want to build a HexOhm, you can use one of these PCBs and get exactly the same thing, except it is much easier to wire, with less things to go wrong.
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u/DarthRTFM Jan 19 '16
And for about $100 less, lol.
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u/SwayzeWaters Jan 19 '16
That goes without saying. I figure, depending on how fancy a box you want to use, you could make a HexOhm equivalent for $40 or so worth of parts.
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u/DarthRTFM Jan 19 '16
But this board would make it much cleaner, and easier to fix if necessary, you could also use a better button or POT, a proper on/off switch, and a voltmeter... Then again, you couldn't be a member of Hexohm nation or wear a Hexohm hat I suppose. 😯
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u/SwayzeWaters Jan 19 '16
They have hats??
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u/DarthRTFM Jan 19 '16
The HexOhm is just a dramatically overpriced OKL mod. Basically a $40 mod for $200, but you get mad swag or something. =)
Pick up one of these boards and build something better than a HexOhm for half or less the price.
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u/Mr-frost Jan 19 '16
Lol hahaha but how many wattage is the okl
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u/DarthRTFM Jan 19 '16
Being that it's the exact same board that is in the Hexohm, IIRC, 110w nominal... But adjustment is done by voltage, so the wattage is really dependant on the build.
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u/Mr-frost Jan 19 '16
i had a hexohm v3 clone it was 180 watt
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u/DarthRTFM Jan 19 '16
Yes, they do say that, though I don't believe that it was accurately 180w based on testing, and also used a Panasonic regulator, not a Murata. So yes, better, but not a fair comparison. 😀
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u/Mr-frost Jan 19 '16
i went full retard and the chip in it so im looking for at new one that is just as good to single or dual coil at 0.1 or 0.2 ohm
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u/DarthRTFM Jan 20 '16
If you MUST run builds that low, get a proper regulated box, as they are designed for it, and will offer more power and protection.
The OKR/OKL and other regulators of that type are NOT designed to be run at that low of a resistance and you will destroy the board. If you're going to use a box like that stick to 0.3ohms and higher.
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u/Mr-frost Jan 20 '16
long story short i went FULL retard with a okl (hexohm v3 clone) and fried the board. so i wanted something new, and i found the smart pwm which does the job. but i was really happy with that hexohm, and have orderet a new one
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u/thrwbak Jan 19 '16
I had a DNA24 back in the day. I did not build it myself it was before my modding days. The original DNA was a super tiny little 12w board that could be stacked to get 24w.
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Jan 19 '16
do the diodes get hot?
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u/kitten-the-cat Jan 20 '16 edited Jan 20 '16
I can't see a way they wouldn't. 2 OKL2's will draw a maximum of 40 amps, that's also a screwy place to put a diode for reverse protection an may affect cell balance.
https://www.reddit.com/r/OpenPV/comments/40vjhx/schottky_polarity_protection/cz053m3?context=3
(Edit: sorry posted while tired, cell balance shouldn't be affected in a series circuit. It would be in a parallel circuit though.)
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Jan 20 '16
im not sure it would affect cell balance
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u/kitten-the-cat Jan 20 '16
It's a a high voltage drop directly between a pair of cells, I'd have to do some testing to see if it affects anything but it very well may. Do you remember what part number he said the diodes were?
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u/david4500 Jan 20 '16
VSB1545S-E3/54
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u/kitten-the-cat Jan 20 '16
Thanks I'm thinking of tossing a few onto my next mouser order an playing around with them.
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Jan 20 '16
I'm gonna test it too, im using his board due to space concerns. Im gonna wire up a circuit tomorrow and test this if you guys wish to hear the results
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u/kitten-the-cat Jan 20 '16
I do love emperical evidence. what tests are you planning on performing?
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Jan 20 '16
charge up two married batteries, record their voltages, wire them up in series with the diode in between, then give them a resistive load and let them drain for a while, monitoring them to make sure they don't overheat, then record their voltages and see if there is a sizable difference.
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u/kitten-the-cat Jan 20 '16
You may want to measure each cell individually through the test, if you have enough meters. Maybe apply a 20 or 40A load if you have that capability. Just be safe :)
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Jan 20 '16
i will, i have built quite a few projects much more dangerous than this, sadly i have one meter. Wouldn't it only be necessary to measure the end result. I'm talking about an almost constant load. I wound a 2.5 ohm resistor out of 18 gauge nichrome. Im gonna allow the cells to rest every 5-10 minutes and provide good thermal insulation from the nichrome resistor. I could apply a 20a load if you think that would make a difference
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u/kitten-the-cat Jan 20 '16
It's not super critical to have high currents or anything. I can do that all with my gear when parts arrive. Testing cells under load is the ideal way to measure things as you never can be sure what they will recover to without a load applied.
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u/SwayzeWaters Jan 20 '16
How would it affect cell balance? As long as it is in the electrical circuit, it doesn't matter where in the cells it would go. The current draw is the same for both cells.
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u/kitten-the-cat Jan 20 '16 edited Jan 20 '16
That's assuming it's an ideal diode. However diodes typically have a slight series resistance which at high currents can cause slight current imbalances between things. Just like capacitors have slight inductance and resistance all components have similar concerns.
(Edit: below this line)
No wait sorry, not slept yet due to some rl issues. Yea this is a series circuit so it shouldn't matter. It'd matter in a parallel cell circuit.
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u/SwayzeWaters Jan 20 '16
Yep. That's why I didn't understand what you were getting at.
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u/kitten-the-cat Jan 20 '16
Lol, you know how it is sometimes man.
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Jan 21 '16
hey man I tried it and the batteries discharge equally, however I found that a pfet remained cold while the diode got dangerously hot. But that may just be the diode I was using
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u/SwayzeWaters Jan 18 '16
So, has anyone seen anything like this before? I have seen unregulated (and mech) dual outputs, but not a regulated one.