My OKR-T/6 mod in an Altoids tin

[snackadmiral]

My main mod wasn't exactly portable, so I set out to get something powerful, variable, and pocket-sized.

I made a little circuit board that holds the pieces of a basic OKR mod and fits next to batteries in an Altoids tin:

Just an OKR-T/6, a pot to adjust the output voltage, a trigger, a master OFF switch, caps, and a couple of resistors. The schematic & board layout are free for anyone to use, just ask me. I'll stick them up on github sometime soon anyway.

Here it is soldered up and working

Some pretty rough cuts on the tin, I'm just testing the thing before doing a nice one.

Not shown:
* The trigger lights up when you press it.
* There's a DC barrel jack at the bottom for charging.
* I measured output voltages and marked them on the lid around the knob, so I don't need a display. It goes from exactly 3.5V to 6.0V.

The batteries are two matched li-ion 18650 with a little PCB in the wrapper to prevent overcharge/underdischarge plus a 7A polyswitch. They can deliver 7A without breaking a sweat but they will never need to go above about 4A. This means there's effectively *zero* voltage sag when loaded; If it reads 6V unloaded, it will actually deliver 6V into 1.5ohms and destroy your carto/atty. The matched batteries also means I can charge them as a pair without removing them from the tin, and I can vape while charging.

Been using it exclusively for about a month now and I'm totally happy with it. Lasts about three days of heavy vaping at ~4V and hits hard until it quits.

 

[snackadmiral]

(I would have posted this in the modding forum but I'm still new here :-/ )

 

[bzmotoninja83]

This looks awesome. Its the bees knees and the cats pajamas.

 

[Covert]

WOW! Throw a voltage display on it so I dont kill carts or atty's and i'll buy one : )

 

[madgr]

That is a truly nice try. There is lack in VV mods in metal cases like a provari for example and that don't come from China quality-wise. So please go ahead and put this in a nice shell and i want one too.

 

[Dougiestyle]

If the OKR-T is a step-down, what kind of charger are you using for the batt series? Have you considered producing this circuit for purchase? I have a OKR-T10 that I never got around to completing in a mod lol.

 

[snackadmiral]

The charger connects on the battery side of things, so the OKR is unaffected. It's a two-cell li-ion charger, 7.4V @ 1.2A

 

[icky]

This is a really nice piece, do you have any more? I have been looking at making a okr mod as my first mod and did not want to use globs of ugly hot glue. If you don't, I know nothing about getting pcb printed and what companies are good; I would donate to get some more printed because i want several for family members that want to quit. Perfect holiday gift!