Single in parallel question

[nicobeak]

I am playing around with some builds on my Odin, and have a few questions.

First of all, I am running on a dna device.

So, I tried a new single coil in parallel yesterday because I had seen a buddy do one for his mech. I did 8 wraps each with 28g coming in at about .75ohm. It vapes fantastic. Then I started thinking, since I'm using a vw device, couldn't I just wrap a 16 wrap single coil and get the same surface area? Is there a point to a single in parallel coil on a vw device? I am sure there is stuff that I am not thinking about here.

 

[wshanncap]

running the single coil (assuming the wraps are the same diameter) will give you more ohms. i.e. If 8 wraps gets you 1.5 ohms then two coils at 8 wraps gets you .75 ohms. But a single coil of 16 wraps will give you 3 ohms.

 

[johndoe1027]

running the single coil (assuming the wraps are the same diameter) will give you more ohms. i.e. If 8 wraps gets you 1.5 ohms then two coils at 8 wraps gets you .75 ohms. But a single coil of 16 wraps will give you 3 ohms.

Yes. That. But to answer the question about VW mods I don't think there would be a difference in the vape. There might be a difference in the electrical behavior though. Granted, I don't have a VW device (yet) but 23.5W is 23.5W. I guess the unknown is what Wattage are you set at? I think the higher resistance of a single coil would make the DNA crank up the voltage to give the same wattage. This is where someone with more knowledge will have to step in. If you quadruple the resistance, the mod will have to double the voltage to net the same wattage? That would also double the amperage. I think. Sorry, I'm a mech mod user so I'm probably over-simplifying this.

If it's vaping good, and your mod is happy with the load, I'd just rock it out.

 

[cammelspit]

Short answer, yes? Long answer, it's kinda more complicated then that... here is an example as it would apply to vaping. when using a fully charged battery at 4.2 volts and drawing 40 watts would need a coild of about .44Ohms and would be drawing a nice 9.5 amps or so. if say you doubled that to a hefty 8.4 volts then the exact same 40 watts draws HALF the amps at 4.75 and needs a greater resistance of about 1.76Ohms. I guess you could think of volts as the total width of a pipe the (Max electrical capacity). For more detail you can read the Wikipedia, its not too hard to grasp. Volt - Wikipedia, the free encyclopedia When it comes to vaping though there are a few issues to hammer out. 1, when using a mech you use only one battery (Unless you stack but thats a different conversation ) and are at the mercy of the direct resistance of the battery, mod, atty and coil. When using a VV/VW device the whole game changes to something VERY different.

There are a few ways a device, not just ecig stuff but all electrical circuits, can vary the voltage. We, thankfully, use DC/DC devices and don't come right out of the wall so we don't have to worry about massive transformers or rectifiers so the circuitry we use in vaping can be rather small and fit nicely in a mod. The easiest way is using a "Linear Voltage Regulator". These components are very inefficient and waste a lot of your power as heat and are as such not used much in commercial products and I am unaware of ANY vaping device that uses this method. You also have what is called a "Buck Converter" used with a "Switch Mode Power Supply" https://www.youtube.com/watch?v=CEhBN5_fO5o. I have an SVD and this device uses what is called "PWM" or "Pulse Width Modulation" and this is a method of very quickly switching the power on and off to achieve that "Just Right" vape we all want. The downside is many, if not most, methods can only take the max input voltage, say 4.2V, and drop it down, not increase it. Certain complicated circuits can for sure but these will simply draw more current at up the voltage and a DC/DC converter can cost real $ to implement. So, I guess what i'm trying to say is that not all devices are made equal and many simply will not do a voltage step up like you might want it to. Just make a coil that's in the mediocre range of your device and the performance should be better and not to mention more efficient and waste less power as heat and that is ALWAYS good for vaping. You will have to read very carefully your devices manual and understand what the drawbacks are and if it can even elevate the voltage at all.

I don't know if I even helped at all or made you more confused but there you go.

Oh, and I didn't even mention the cheap Chinese clones that technically have similar performance to the originals but with the low quality of components, in reality simply don't deliver as advertised.

 

[johndoe1027]

Sounds like I was oversimplifying the VW mods. I thought the PWM somehow magically upped the Voltage (which I didn't think it could do but I'm still learning). So how do the 5 and 6V capable mods make the extra voltage?

 

[edyle]

I am playing around with some builds on my Odin, and have a few questions.

First of all, I am running on a dna device.

So, I tried a new single coil in parallel yesterday because I had seen a buddy do one for his mech. I did 8 wraps each with 28g coming in at about .75ohm. It vapes fantastic. Then I started thinking, since I'm using a vw device, couldn't I just wrap a 16 wrap single coil and get the same surface area? Is there a point to a single in parallel coil on a vw device? I am sure there is stuff that I am not thinking about here.

Yes, but the difference comes in the wicking; when the coil is too long, the center of the coil tends to dry up faster that the wicking can wick; so you use larger diameter coil; but too large diameter has it's own problems I think.

Some people with make the long coil with a space in between, and run two shorter wicks instead of one long wick; some people bend the coil in half to make a double barrel so as to run the two short wicks

 

[cammelspit]

Unfortunately no, PWM is prolly the cheapest simplest way to vary the voltage but imaging is the duty cycle (How on the PWM circuit is) is 100% then that is just ON all the time, maxing the battery but essentially being a mech at that point, assuming the hardware can handle that. The way I have had experience with to UP the voltage is what is called a "Boost Converter". As the name implies it can boost the voltage! If you have ever heard of a "Jewel Thief" it works on a similar theory. An inductor is used to store electrons (Charge) as a magnetic field and when the charge hits the correct levels it is dumped into a capacitor and in turn the "Load", your atty. The OKR and other chips used in many box mods are these nice little chips that have a boost converter AND a switch mode power supply built in to make mod design easy. These types of devices, and others that have combined supply types, are generally the most versatile since they can BOTH boost the voltage and curb it as well. These devices are also either complicated to build with soldering and diagram reading skills needed or they can cost hundreds of dollars. I only just upgraded from and SVD to a Maraxus clone so i'm kind of a newbie when it comes to the specifics of certain devices but I do understand more about the electronics side of things and am ITCHING to build me one as soon as I can come up with the cash and the time to do it, maybe a Christmas present to myself... I like this guy on youtube, hes ok and very informative https://www.youtube.com/watch?v=wJU7AJgERG8 If you are even more interested Dave Jones, "That Crazy Australian Bloke" https://www.youtube.com/user/EEVblog is an awesome dude to watch do his thing.

 

[cammelspit]

Oh I forgot to actually answer the question, DUH, I got carried away... My SVD can do stacked 18350s = 8.4 Volts and has a max outputs voltage of 6V. So with PWN u can only stack to increase the voltage and thats essentially it. Unless a boost converter is used and I covered that in my long winded smarty pants answer.