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mini detonator - a build guide
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gords1001 Offline
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Post: #1
mini detonator - a build guide
I've been  concerned for some time about the current use of li ion cells amongst cloud chasers. In short, cells are being pushed way beyond their limits and people risk getting seriously hurt. I'm aware that quite a few members of the community, both venders and individuals are concerned about this, so i wanted to show that there is a safer way to super sub ohm, simply by using what some people already use, but choosing a far more capable power supply. The result is the mini detonator. A miniaturised version of the test  rig i built to prove the concept and carry out a punishment test of a new connector designed by stealthvape, a prominent uk vender specialising in kanthal, various wicks and plenty of mod parts. If you haven't seen their site, i suggest you take a look.

https://www.stealthvape.co.uk/index.php?...pe=desktop

Here's the detonator search list

http://www.stealthvape.co.uk/index.php?r...=detonator

You'll need a switch, switch wiring, 510 connector and magnets are a nice addition. I would use 3mm by 4mm magnets in the box and 6mm x 2mm magnets in the lid.

I'll add this video, as it saves me typing and covers the whole premise of the project.







The build is simple, as said in the video, its a mosfet switching a turnigy nano tech 5600mah 2p lipo pack with 65c continuous current and 130c 10 second burst.

So that is 5600 × 65 ÷ 1000 = 364amp continuous
                 5600 × 130 ÷ 1000 = 728amp 10 second burst.


Its a very capable pack. Particularly  when compared to a pair of 18650 cells in parallel, which is the current box mod vogue. The pack size is 93 x 47 x 18.5 mm, but a little room is necessary for the 90 degree banana connectors supplied.
This picture demostrates the layout in a hammond 1590n1 box.

[Image: 20150305_184217_zpsfeboleq3.jpg]

As you can see, the box is deeper than the 1590g boxes people are used to, and it is a touch taller. This was mainly to ensure an easy build, with careful component placement and use of a micro switch, along with stealthvapes new style 510 connector, i believe this can all be squeezed into a smaller hammond enclosure, the circuit could obviously also be incorporated into a custom timber or 3d printed enclosure.

This link shows the whole wiring set up, and is as applicable to our subject here as it is a a traditional hammond box build.

http://www.modipedia.com/topic/11/irlb30...n-progress

In our box it will end up looking like this.

[Image: 20150308_175709_zpslezilcql.jpg]

[Image: 20150319_205637_zpswleaktm6.jpg]

The second photo also shows the new stealthvape connector and how it will be used in our box. The easiest way i have found is to tin your wire, add a dab of solder paste to the brass contact then hold the tinned wire on with your iron. As its a peek insulator, there's no risk of melting anything, it just works.

So. Now we see what we are intending to do, best show how we went about it.

First i added the magnets for securing the lid. It costs 4 pounds to buy 20 of each set of magnets, and is a worthwhile addition to the box as it makes pack changes effortless.

I did cock up and forgot to order the 6mm x 2mm magnets for the lid, so i had to open the holes out for the 10 x 2 mm magnets i already had

[Image: 20150306_192514_zps5qbty9ia.jpg]

I used a 10mm countersink to open out the holes.

[Image: 20150306_192520_zpsf0fdngw9.jpg]

Obviously ordering the correct magnets saves this job....

Once they sit pretty, i used jb weld (chemical metal) to bond them in place.

[Image: 20150306_193618_zpskblrltrj.jpg]

I fitted 3 x 2 mm magnets in the box, they just needed tapping home with a wooden mallet. I would fit these, drop your lid on then fit the lid magnets (then you get the polarity correct) then bond in the lid magnets, let the chemical metal/jb weld set then file/sand it smooth.

[Image: 20150306_192507_zpsfoqpdr4a.jpg]

While the lid is curing. We can drill out the box. There's no complicated marking out. Just strip the 510 connector, hold it in place and drill through with a pilot drill.

[Image: 20150306_194518_zpso0mr04ju.jpg]

Using a suitable drill/holesaw for your switch, drill where you've decided to locate it.


[Image: 20150308_093652_zpsgxr2dsh2.jpg]

Add your vent holes.

[Image: 20150306_194541_zpsvedu5f4g.jpg]

Then you can start building your mosfet assembly.

[Image: 20150306_195034_zpsdojg8avh.jpg]

First tin your legs and fit your resistor.

Then add your wires to the outer legs. Switch wire to the left. Battery negative to the right. (I cocked up here, but the photos will serve to show the negative connection to the 510 but NOT THE CORRECT CONNECTION FOR A FUNCTIONAL BOX. I had to sort that out afterwards).

This best shows the plan. The outer legs will both be insulated with heat shrink. The centre leg solders direct to the connection ring of the 510 connector.

[Image: 20150306_195340_zpsdwhyxr8g.jpg]

Once assembled you can spot through the mosfet mounting hole for a screw to secure the mosfet to the box.

[Image: 20150306_200622_zpsczpmkyer.jpg]

Once all this is done, you can strip and paint the box before final assembly.

[Image: 20150308_153102_zpsa8qo1dlr.jpg]

[Image: 20150308_175637_zps0obvebvs.jpg]


[Image: 20150308_175643_zpsb0sxys35.jpg]

All that is needed is screw everything into the box, solder your battery connector, including a small wire from positive to switch and from switch to the left hand (gate connection) pin of the mosfet and its ready to test.


[Image: 20150308_175709_zpslezilcql.jpg]

You can see i favour deans connectors, though xtc60 connectors are just as suitable, though slightly bigger if space is a concern. You could also just use the banana leads and have another set for charging.

Hope this all helps and feel free to contact me with any questions.
19-03-2015 08:37 PM
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Post: #2
RE: mini detonator - a build guide
Good on you!

Must get around to building my one.

TVF tested battery info to be found here

http://www.preventsuicideapp.com

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19-03-2015 09:01 PM
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gords1001 (03-19-2015)
gords1001 Offline
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Post: #3
RE: mini detonator - a build guide
Its an awesome bit of kit Don.Wizard There's a lot more to add, including a shopping list that i may need to hold off on, but you've seen the calculations on the test rig. Its well capable of silly silly builds.
19-03-2015 10:02 PM
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Spasmod Offline
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Post: #4
RE: mini detonator - a build guide
Very nice build Graham Drinks
19-03-2015 11:07 PM
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gords1001 (03-20-2015)
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Post: #5
RE: mini detonator - a build guide
Great build, thanks for showing how you did it. I'll have to order some parts to build my own! The video was great too, you explained everything very well. I really hope this is the next step in vaping, as it seems you can get more power out of it (which is the popular trend at the moment) while also staying much safer. You ought to get a patent on that design and sell it to a manufacturer Tongue
20-03-2015 03:25 AM
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gords1001 Offline
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Post: #6
RE: mini detonator - a build guide
Nah. This ones open source, it's inexpensive entry to what is imo the next logical step in unregulated vaping (mechs etc). I want people to be safer and i believe this is one way that can be helped along, I'm also seeing battery sled issues popping up and causing shorts, this moves away from that, you dont even need the connector - battery wires live when you solder them (you did on my old packs and its like priming a bomb.. )
20-03-2015 07:06 AM
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Michael (03-21-2015)
Pulsar Offline
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Post: #7
RE: mini detonator - a build guide
Good build! 
I actually have 2 smaller lipo cells I bought for a mod I never got around to. Together they are the size of a 9v battery, but only good for 26 amps in parallel. 
I got a crap ton of FETs, and a modified box already. Need to order up a good 510 connector, a nice switch and maybe find some new cells that will fit in the box. 

[Image: 1299139200_30_1_USD_7.50_dark.png]
21-03-2015 01:01 AM
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gords1001 Offline
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Post: #8
RE: mini detonator - a build guide
Cheers pulsar, the more i use this the more i like it, its just effortless unregulated power And as its 4.2v anything is fine on it, just performance is improved due to less battery sag. Anyone who likes mechs would be right at home with this
21-03-2015 06:30 PM
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Post: #9
RE: mini detonator - a build guide
Few questions on the build. About how big of a hole is needed to fit the 510 connector on the box? 

My box is exactly 22mm, but looks like the hole needed would be smaller.

What type of fet is needed, N or P? Part number would be nice too, as I could compare to what I have and maybe have a suitable one here.

What resistance is the resistor? 

Also, the current going through the switch is negligible isnt it? Just enough current to pull up the fet I believe


Edit: Found a 510 connector that looked like what you used on ebay and ordered it. it will work on the box just fine 

[Image: 1299139200_30_1_USD_7.50_dark.png]
21-03-2015 06:49 PM
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gords1001 Offline
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Post: #10
RE: mini detonator - a build guide
Let me come back with those answers tomorrow, I'm off to bed and dont want to get it wrong. My mosfet will be serious over kill for a 30amp pack. Resistor is usually stated as 15kohm iirc though it seems any will work, and yes, the switch sees micro amps. Think of the fet as a relay on a car for spotlights.
21-03-2015 11:08 PM
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