Dual serial coils....

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AttyPops

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Is this a single piece of wire?

Wait. Maybe I'm not understanding here. But wait..............

Are you guys actually talking about Dual-Series coils?

1) The answer to "Is this a single piece of wire" is YES. Basically "Dual -series coils" = 1 coil, just longer. Maybe with a straight-spot "gap" so you can fool yourself into thinking it's two coils.

If you smoked, did you call 100mm cigs "dual shorties"? :lol:

2) The voltage isn't split for series coils or parallel coils. The voltage remains the same. The WATTAGE is split, but that's for parallel (not serial) coils. Coils in series are still one coil.

So I guess I'm wondering if I'm understanding this conversation properly....

--- OR ---

Now, if you are putting the "gap" at the + pole, and the other ends at ground...that's not serial. That's parallel..... Doesn't matter if it's a connected wire or separate wires as long as they make contact at the center post lug...it doesn't care if the wires are connected to each other or not.

so:

......P
..../.....\
../.........\
G..........G

is a parallel circuit (ignore the '.'s)

And ....(lol???)

P___////_/////____ G is a series circuit of one coil...with a bigger gap between some coils around the center point.

:)

But it's all good, as long as it works safely. :)

P = + and G= - in the above
 
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Equilibrium

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Hey, here's a great tutorial on doing parallel with 28:

The Art of the Parallel Coil: A Guide to Boosting Your Vaping Output

Also, have you tried twisted 28?

Look Here:
https://www.youtube.com/watch?v=pPjuJ0ZLxLI

Obviously, if you want a higher resistance, do more wraps. :)

That was the whole problem... trying to hit the 1.5 ohm mark with dual parallel coils using 28g wire without shorting out when the chimney is screwed on. I had no problem wrapping the coils or connecting them and everything metered out perfectly. The problem presented itself when I put the chimney on. The coils were too big.
 

GMayberry

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This is a bit off topic, but on the same lines.... I have a Stringray mech in 18650 mode, with a Tobh Atty wrapped at .4Ω, with twisted 28gauge. I really want to up the Ω in order to cool the vape some (it's just too hot for my liking). With 28g it is going to require a lot of room for all the wraps, so I am brainstorming. How about two coils on each side, vertical side-by-side (one piece of wire per side of course). I guess kind of built like a diamond coil, but only two coils on each, not 4, and sitting vertical. Does this make sense? I'm on a work PC, so I can't even draw a picture to upload. I am shooting for around 1Ω-1.4Ω.
 

chapeltown

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Here is a comparison....
1/16, 5/64, the rod I used, and a #0 screwdriver.
eze9equm.jpg


And my coil I did the other day...it helps to tilt it slightly up on the wall side...
avunare7.jpg
 

Equilibrium

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Well....I did a twisted 28 on my little Igo -10 wraps came out to 1 ohm exactly and it fit just fine, but I used a slightly bigger rod to do it.... I'll grab a pic and post it...

Yeah but, the Igo-W build deck is a lot bigger than the inside of the chimney of an aqua. I can easily do parallel coils at 1.5 ohm on my helios.
 

Equilibrium

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Oh, it's alright.

I've done parallel coils on the Aqua before BUT I was sub-ohm with them .6 - .7 ohm, so the coils were much smaller. I just wanted to try it out on my DNA 30 devise and it's sweet spot is around 1.5 ohms. That serial coil setup works great though and easy to build with no shorts against the chimney.
 

AttyPops

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That was the whole problem... trying to hit the 1.5 ohm mark with dual parallel coils using 28g wire without shorting out when the chimney is screwed on. I had no problem wrapping the coils or connecting them and everything metered out perfectly. The problem presented itself when I put the chimney on. The coils were too big.

The "problem" in that case....is that you're using 28 ga wire, but trying to get to 1.5 ohms. Just use 30 or 32 ga wire if you want true dual coils (in parallel, not end-to-end).

Even if 28 ga fit, you probably won't get enough watts to make it glow well and still have single wire length to get you to 1.5 ohms end-to-end. Hence the whole SLR craze.
That thick wire needs a lot of elections (part of the watts equation) flowing through it to make it glow. So I'm surprised a "long" single-coil wire (gap or not) at 28 ga @ 1.5 ohms even works with normal voltages. I would think it'd be quite cool.

Or you're splitting it and it's really parallel (and probably on a mech)

So, I repeat, there's no such thing as a serial dual coil.
It's either a single coil, with or without a gap between some coils, or it's a parallel circuit.

:2c:
 
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Equilibrium

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The "problem" in that case....is that you're using 28 ga wire, but trying to get to 1.5 ohms. Just use 30 or 32 ga wire if you want true dual coils (in parallel, not end-to-end).

Even if 28 ga fit, you probably won't get enough watts to make it glow well and still have single wire length to get you to 1.5 ohms end-to-end. Hence the whole SLR craze.
That thick wire needs a lot of elections (part of the watts equation) flowing through it to make it glow. So I'm surprised a "long" single-coil wire (gap or not) at 28 ga @ 1.5 ohms even works with normal voltages. I would think it'd be quite cool.

Or you're splitting it and it's really parallel (and probably on a mech)

So, I repeat, there's no such thing as a serial dual coil.
It's either a single coil, with or without a gap between some coils, or it's a parallel circuit.

:2c:

Yeah, I know for dual parallel coils on that particular RBA I should go up to 30 or 32g wire. I just have a surplus of 28g and want to use it up.

And I see your point.... I guess it's truely one coil with a gap between wraps. It works great though! I'm using it on a Cana DNA 30 @ 15 watts so about 4.74v. It heats up just as fast as a standard single coil does and it allows for a coil over each air hole and wicks on both sides.
photo.jpg
 

AttyPops

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Yeah, I know for dual parallel coils on that particular RBA I should go up to 30 or 32g wire. I just have a surplus of 28g and want to use it up.

And I see your point.... I guess it's truely one coil with a gap between wraps. It works great though! I'm using it on a Cana DNA 30 @ 15 watts so about 4.74v. It heats up just as fast as a standard single coil does and it allows for a coil over each air hole and wicks on both sides.
View attachment 360940

Cool.
That little detail...the watts.... is what many would miss from your post.
You wouldn't want to do this on, say, a standard unit that's limited to maybe 8 or 11 watts. That DNA 30 can push more watts and is near 4.8 volts. ;)
Thanks for being understanding. I'm not slamming your post at all. I'm glad you got it working.
It's just that with these dang e-cigs, the details matter.

Like I said, glad it's working for you. VV is a nice thing. :) Higher amp/watt devices are great too.
 
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