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How to Build an OKR Box Mod Tutorial

The OKR-T10 box mod is one powerful device, this tiny chip allows you to adjust the voltage between 3.4 to 6 volts. Best of all, this box mod is relatively easy and inexpensive to build. As always, I’m going to show you exactly how to build one.

If you are interested in building this exact same OKR box mod that I show you in this video, I do offer complete DIY box mod kits. You can see them at www.Shop.FindMyVapes.com

IMPORTANT: I do regularly stock these kits but they do sellout fast. Please be patient if they are out of stock, more kits will be stocked soon.

I am going to show you step-by-step on how to put this together. There are a lot of steps but just be patient, follow the instructions, and definitely have fun with it.

Let’s not waste any more time, let’s get right to it.

What You Need

Tools You Might Need

Alright, that’s everything that you need. We can now start modding.

Preparing the Enclosure

The first thing I like to do is sand the enclosure. The reason I’m going to sand the enclosure is because most of these project boxes come with slightly slanted edges.

This step is completely optional but if left alone, your atomizer and switches will sit and a slight angle. This is purely personal preference but I like to take the extra steps to ensure and completely squared box.

You can sand this with a belt sander but if you don’t have one, you can always place some sandpaper on a flat surface. Then slowly sand the enclosure until everything is squared up.

After you have prepared the enclosure to the way you want, we can now plan out the layout of the components.

Laying It All Out

OKR Box Mod LayoutThe first thing I always do is place the battery sled inside the enclosure. This will give me a good idea on how much room I have to work with. There is some modification that needs to be done with the sled as I show you in the video. The sanding is done to allow the battery sled to sit as far to the right and as far down as possible.

After you have the battery sled in place, we can decide on the placement of the 510 connector. I personally like my atomizers to sit in the middle of the enclosure. You are welcome to move it to the either side if that is what you prefer.

Next we can move onto the fire switch. Again I like to position it on the top left side of the enclosure but you can place it anywhere you like. I also like to place the potentiometer on the same side as the fire switch but further down the side.

The master on/off switch is optional but I like to position it on the inside of the enclosure. This will allow me to turn of the mod to avoid accidently firing when carrying the OKR box mod in a pocket or bag.

So now that we know the layout of all the components, you can now start drilling out the holes for the 510 connector, the fire switch, and the potentiometer.

I have a very detailed video showing you the drilling process. You can watch that video titled “MOD TIPS #02 – How to Drill Holes for Box Mods.”

Wiring It All Up

There are several different way to wire an OKR box mod but I have drew the wiring diagram that I used for this video. I personally feel this wiring diagram is the easiest to follow and provides the most options for your OKR box mod.

OKR final wiring (titled)

OKR Chip Wiring

If you look at the OKR chip you will see that it has 5 legs. These legs are numbered from right to left, so the right most leg is number 1.

Pin #1 is known as the remote pin. This pin is basically the on/off pin that will fire the chip. Because there is very low amperage running through this pin, you can use any type of firing switch that you like. There is no need to base your decision on amp limits of the fire switch.

Pin #2 is our power pin. This pin will connect directly to the positive contact of our battery sled.

Pin #3 is our ground pin. We will use this pin to connect to the negative/ground of our 510 connector.

Pin #4 is our power output pin. This pin will be connected to the positive pin of our 510 connector.

Finally Pin #5 will be connected to our potentiometer. This will allows us to adjust the voltage output of our OKR chip. You will need to connect the 220 ohm resistor in between Pin #5 and your potentiometer.

OKR Chip WiringSo now you know all the pins, I will go ahead and show you the steps I take to wire up the chip. Please watch the above video for more detailed wiring instructions.

The first thing you might notice in the wiring diagram is the 1k ohm resistor. This resistor needs to be soldered to pin #1 and pin #3. This acts as the pulldown resistor to prevent auto firing.

The Zener diode also needs to be solder to pin #1. Is acts as an under voltage protection for your battery. When your battery voltage drops too low, the Zener will prevent you from firing your OKR box mod.

Next move onto the positive and negative wires of the OKR chip. Simply solder your wires to pin #2 and pin #3. Another positive wire will also need to be solder to pin #4 as this will connect to the positive pin of the 510 connector later.

For pin #5, you will need to solder our 200 ohm resistor in similar fashion as the zener diode that you connected on pin #1.

The OKR chip should now be fully wired. It is recommend to heat shrink each connection to protect the solder joints and it also gives a much cleaner look to your wiring.

Battery Sled Wiring

The OKR requires you the run your battery configuration in series. So when inserting your batteries into the sled, the negative will be up on the left slot and the positive up on the right battery slot.

To put this into words, your batteries will need to be place NEGATIVE ->POSITIVE->NEGATIVE->POSITIVE.

The first thing to do with the battery sled is to solder a small wire connecting the two bottom contacts. Remove the contacts from the sled to avoid melting the plastic housing.

The top contacts will have your negative and positive wires soldered to it. Again, the left contact is the negative while the right contact is the positive. We will need to wires soldered to both top contacts which will be used later in this tutorial.

That should be it for the wiring on the battery sled for the time being. Go ahead and place this off to the side.

Potentiometer Wiring

Potentiometer WiringThe potentiometer will have 3 pins on the back. This will essentially increase or decrease your resistance which will allow you increase or decrease your voltage output.

To do this, you want to first bend the middle pin to the right so that it connects to the right outer pin. Solder these pins together as well as a black negative wire.

The outer left pin will have a red positive wire connected to it. This left pin will eventually connect to pin #5 on the OKR chip.

As always protect your connections with heat shrink.

Master On/Off Switch Wiring

The master on/off switch is a sliding switch and will have 3 legs. You will need to use the middle leg as well as one of the outer legs. It does not matter which outer leg you choose to use.

Just know that whichever leg you use will be the “ON” position.

Once you have your legs figured out, you can now solder a single red wire to each leg.

510 Connector Wiring

The 510 connector is pretty basic to wire. The housing of this connector will act as the negative/ground and the inner pin is the positive. You just need one wire for the positive pin but will need 2 wires for the negative housing.

In this video I used a standard sealed 510 connector. You can definitely choose to upgrade to a spring loaded 510 connector.

I do have a detailed video explaining how wiring an upgraded 510. You can watch the video titled, “MOD TIPS #03 – Fat Daddy vs Varitube Spring Loaded 510 Connector.”

Alright so this should conclude the first part of our wiring diagram. We will do the final connections later once we have all the components placed inside the enclosure.

Spraying the Enclosure

The Hammonds 1590g enclosure that I used in this video is bare aluminum. This allows us to customize the way our OKR box mod will look. You can paint it anyway you like but I chose to use spray on bed liner.

The bed liner is a tough and durable finish and also provides a super grippy feel to it. It is also very easy to touch later down the road if you ever get any scratches or blemishes.

Securing the Lid

Lid MagnetsA very popular way to secure your lid is with magnets. We will utilize four 1/4 x 1/8 round magnets and epoxy them to the lid. The supplied screws for the enclosure will be used to attract these magnets.

To make these screws sit flush with the enclosure, you need to drill out and countersink the screw holes. This is very simple to do by just using a 1/4 drill bit.

This 1/4 drill bit will also be used to countersink the magnets to the lid. See the above video for more detailed instructions.

I just like to counter sink these magnets instead of drilling out the lid completely. Leaving some metal in the lid holes will prevent the magnets from ever pulling out of there holes.

 Epoxy Time

This is now a good time to start epoxying everything to the enclosure. I like to use 2 part epoxy for securing all the components to the enclosure.

You may want to practice a little with you epoxy as it can get quit messy if you are not prepared for it.

Please be very careful when epoxying the potentiometer. You can permanently ruin the potentiometer if you can epoxy inside the potentiometer preventing it from rotating. You will want to apply some electrical tape as protection. Again, watch video for more detailed instructions.

Almost Done!

Ok so now we have everything in place. We can now move onto the final wiring.

This will be the most difficult part of building your OKR box mod. If you look at all the components, you will realize that it’s going to be a very tight fit to get everything inside the enclosure.

The best thing to do at this point is to study the wiring diagram and go for it. You are kind of on your own at this point. I will do my best to show as much of the process as I can.

What I like to do is to start from the bottom with the potentiometer and move towards the top.

Just take your time and start soldering all your wires together and heat shrink every connection. One thing to keep in mind is that the wires connecting to the fire switch is NOT soldered. These wires will be screwed down to its corresponding terminals.

Final Thoughts

Alright you hopefully have successfully completed your OKR box mod! Congratulations!

The OKR box mod is definitely one of my favorite regulated chips to use for box mods. It delivers up to 50 watts and is a very solid and reliable chip to use for your box mod projects.

There are some limitations to be aware of with the OKR chip. The OKR has a limit of 10 amps, which means that you will want to build your coils at around 0.6 ohms and above. Your mod will still fire below 0.6 ohms but this could reduce the life of your OKR chip.

This is definitely a fun project that I recommend everyone to try! Again, you are interested in building this exact mod that I showed in this video, you can get complete DIY OKR Box Mod kits at www.Shop.FindMyVapes.com

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  1. I want to order these components to make my own box mod.

  2. i built this and wired exactly as shown, and as soon as I put batteries in it fired on its own. so I disconnected the master on/off switch and the fire switch, and it still fires on its own with those wires not connected. any ideas on what could be going on?

  3. what if i use a 5600mah batt. actually its my old power bank batteries and i will connect a usb charger so what would i do

  4. Were would I be able to buy a coil that will fit right in that

  5. I used a 5.1 zener diode instead of the 5.6. Would that cause it to only fire at 2 volts.