Official DNA 40 introduction

[rurwin]

If anyone is interested, I've just made another spreadsheet.

It allows you to enter the coil data and reports the resistance for each wire size and the length of wire used. It works for kanthal, nichrome, ni200 and copper. It will allow you to enter data in mm, cm, m or inches and it will report its data in any of those units. It works for single or dual coils, (or any other number for that matter.) It handles compressed or spaced coils.

As a bonus it will also allow you to work out which European stranded wire you need to use to connect up a DNA40, which specifies it in AWG.

https://dl.dropboxusercontent.com/u/96640124/Wire and Coils.xls

There are no macros used. XLS is generally an unsafe format to accept files from strangers, but for spreadsheets there is no good alternative. To mitigate the worry a little, here are two examples in PDF.

https://dl.dropboxusercontent.com/u/96640124/Wire and Coils kanthal.pdf
https://dl.dropboxusercontent.com/u/96640124/Wire and Coils ni200.pdf

 

[Dampmaskin]

There are no macros used. XLS is generally an unsafe format to accept files from strangers, but for spreadsheets there is no good alternative.

Have you tried Google's spreadsheets?

 

[350ZMO]

If anyone is interested, I've just made another spreadsheet.

Thanks.


View attachment 381491

I wrap my coils on an M3x.5 screw, 8 turns, dual coils in parallel for a fogger. Picked up 28, 30 and 32 ni200 from fleabay.

 

[spewny]

Thanks.


View attachment 381491

I wrap my coils on an M3x.5 screw, 8 turns, dual coils in parallel for a fogger. Picked up 28, 30 and 32 ni200 from fleabay.

You'll have to let us know how the different builds turn out. I hear the ni200 us super soft so I'm curious what building will be like with higher gauge.

 

[TheKiwi]

^ that. Im hoping I can use 28ga without having to build massive coils

 

[ozen]

DNA 40VideoTutorial - YouTube presented by PBusardo

 

[rurwin]

Here's the Google Docs version of the spreadsheet. Far safer, just a little less pretty.

https://docs.google.com/spreadsheets/d/1if6R72lxfNGpBWGICvFPHoZoOKaVuSFyPSpuYMu7GHk/pubhtml

Thanks for the reminder to look into it, Dampmaskin.

 

[rurwin]

The other way to use the spreadsheet.

My nice spring-loaded 510 connector requires a piece of thin wire about 2cm long to connect to the centre pin. How hot will that get?

The wire that I have that suits it is 7/0.2 ie 7 strands of 0.2mm diameter wire.

https://dl.dropboxusercontent.com/u/96640124/Wire and Coils copper.pdf

I've shaded that to show the areas I am interested in. I set the material to copper and the number of strands to 7. Then I look down for the diameter/strand that I am interested in. The closest match is 24AWG and that is 0.0008 ohms per cm.

If I build a coil at 0.08 ohms and drive it at 40W, then 1% of that 40W will be in each cm of my hookup wire. So 0.4W per cm, and that only until the coil heats up. That's OK.

 

[brickfollett]

Just pre-ordered the vaporshark DNA40. Super excited. I feel like I just betrayed provape and the P3 because that's what I was budgeting for until I saw this

 

[TheKiwi]

Just pre-ordered the vaporshark DNA40. Super excited. I feel like I just betrayed provape and the P3 because that's what I was budgeting for until I saw this

Hahahahah same here. Shakes head. Waiting for the next batch of vapor flask too!

 

[brickfollett]

Flask isn't my style and way too expensive for my taste. I like the vapor shark because in all likelihood is the same or similar size to the reo

 

[Mr.Mann]

Just pre-ordered the vaporshark DNA40. Super excited. I feel like I just betrayed provape and the P3 because that's what I was budgeting for until I saw this

Think about what you can do with the leftover bread!

 

[Heespharm]

I did this on stream engine it just doesn't seem right? Am I doing something wrong or do they have the wrong value in?




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[Rossum]

Yes, you're doing something wrong. You're targeting 0.7 ohms with 28 gauge Ni200.

 

[Heespharm]

Yes, you're doing something wrong. You're targeting 0.7 ohms with 28 gauge Ni200.

Explain... Does nickel need higher resistance to keep from glowing too hot?


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[snork]

It was immediately obvious to me that a resistance target is not what a person should shoot for with nickel non-resistant wire and the DNA 40. I'm not sure why it's confusing people.

 

[Rossum]

I have no idea what kinda atty you're building but try using 30 gauge and targeting something like 0.2 ohms. If you must use 28 'cause that's all you have, target closer to 0.1 ohms. Don't worry, the DNA40 will handle that just fine.

 

[TheKiwi]

Suddenly we are all gonna be super sub ohmers, and still be perfectly safe.

Why why, look at us cool kids.

 

[Heespharm]

It was immediately obvious to me that a resistance target is not what a person should shoot for with nickel non-resistant wire and the DNA 40. I'm not sure why it's confusing people.

Yes everybody give you a round of applause... You're smart and special...

Now back on topic ... So you could not use your atty on any device other than a DNA 40 device without re doing the coil .... That's kind of a bummer as I switch attys and mods all the time...


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[Rossum]

It was immediately obvious to me that a resistance target is not what a person should shoot for with nickel non-resistant wire and the DNA 40.

I disagree. A resistance target of right around 0.1 ohm is not a horrible way to see if you're in the ballpark with your contemplated build. If that still gives you too many wraps, you need to increase your coil diameter or use thinner wire.

But in some ways I'd like it better if it let you enter the number of wraps and then told you what the resistance would be rather than having you choose a target resistance and telling you how many wraps to use.