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Box Mod Help
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Damonb Offline
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Post: #1
Box Mod Help
Hey everybody! I'm new to this forum, and I'm hoping some of you can point me in the right direction.

I want to build a box mod that:
1) uses two 18650 batteries in series
2) utilizes an n-channel MOSFET for switching
3) is regulated by an LM7805 (or similar) chip, OR uses a single 18650 with a charge pump of some sort
4) is VV via a potentiometer

I can find plenty of schematics/wiring diagrams on mods using the MOSFET, but I'm having a hard time finding any showing how to use the voltage regulator, especially with the potentiometer as I understand you can't just wire one up in series because of the high amperage. 

I have a pretty good background in electronics from building guitar effects, I'm just hoping some of you experienced builders can point me to some good wiring diagrams? Any help is much appreciated! Also if I'm breaking any kind of forum etiquette please don't hesitate to let me know, I'm new to this...
(This post was last modified: 14-04-2015 03:11 AM by Damonb.)
13-04-2015 04:29 AM
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Michael Offline
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Post: #2
RE: Box Mod Help
Welcome to the forum! 
I know where you're coming from, I've wired a few guitars myself. Actually had an idea to build a box mod with a potentiometer for VV, but that idea got shot down due to the massive strain it would put on the pot. Guitars use milliamps, while our vaping mods will use far more, and the pots just aren't made to handle that kind of stress. From what I've been told, it would produce TONS of heat in the pot. That said, I'm not an expert on mod building by any means, and I'm sure someone else will come along and offer more help or at least verify what I'm saying. 
13-04-2015 06:18 AM
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Damonb Offline
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Post: #3
RE: Box Mod Help
Really, the more I think about it, I'd much rather be able to use a single 18650 battery, and instead if using the voltage regulator, using some sort of a charge pump, and still being able to have vv via a potentiometer. Like I said though, I'm not finding very good info at all, I'm hoping some experienced builders can help me out! 
14-04-2015 02:10 AM
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Damonb Offline
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Post: #4
RE: Box Mod Help
Also, thanks Micheal for the welcome!
14-04-2015 03:13 AM
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Robjenko Offline
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Post: #5
RE: Box Mod Help
Hi Damonb. Welcome to TVF I ain't got a clue about building a mod I just thought I'd say Hi Good

Vaping Saves Lives. To vape is to advocate..
14-04-2015 04:54 AM
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Don Offline
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Post: #6
RE: Box Mod Help
Hi and welcome Damon

The MOSFET is acting purely as a switch as switches to handle the sort of amps that get used in vaping tend to be enormous.

For regulation the simplest way is some sort of DC-DC converter that can handle the current and wattage.

Pulse width modulation is the other way to go. But keep the frequency high.

Simplest way would be to buy a suitable chipset - Yihi SX300 chipsets are hard to find retail but lots of others are widely available. Mostly they will have an FET switch integrated.

I've seen modules for 40 and 50W Vamos for around $25

But that is the limit of my electronics knowledge.

TVF tested battery info to be found here

http://www.preventsuicideapp.com

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14-04-2015 02:24 PM
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BOB Offline
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Post: #7
RE: Box Mod Help
hi damonb welcome to TVF
this site may or may not be of use  to you http://www.modmaker.co.uk/
good luck with your build Good

if at first you don't succeed ,call it version 1.0
14-04-2015 08:43 PM
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Damonb Offline
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Post: #8
RE: Box Mod Help
(14-04-2015 02:24 PM)Don Wrote:  Hi and welcome Damon

The MOSFET is acting purely as a switch as switches to handle the sort of amps that get used in vaping tend to be enormous.

For regulation the simplest way is some sort of DC-DC converter that can handle the current and wattage.

Pulse width modulation is the other way to go. But keep the frequency high.

Simplest way would be to buy a suitable chipset - Yihi SX300 chipsets are hard to find retail but lots of others are widely available. Mostly they will have an FET switch integrated.

I've seen modules for 40 and 50W Vamos for around $25

But that is the limit of my electronics knowledge.
I was afraid that would be the case. I'm hoping to keep this build low cost, which pretty much rules out any sort if DC-DC converters or digital chips. I think I will just go with MOSFET switching and a single 18650 battery, and most likely a voltmeter and a USB charging board

(14-04-2015 08:43 PM) BOB Wrote:  hi damonb welcome to TVF
this site may or may not be of use  to you http://www.modmaker.co.uk/
good luck with your build Good
Thank you! That site seriously has everything I need in one place, along with some very useful wiring diagrams, again, all in one place. Shipping is $10 with it being in the UK, I suppose that's acceptable though, considering I was going to have to order my parts from 2 or 3 different sources
(This post was last modified: 15-04-2015 05:17 PM by Damonb.)
15-04-2015 05:08 PM
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Spasmod Offline
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Post: #9
RE: Box Mod Help
Welcome Damon, and good luck with your box mod Drinks
16-04-2015 06:53 AM
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