Time to start a new mod, looking for input and inspiration

[nerve007]

My current mod seems to be on its last legs, so it's time to make a new one.

Here is what I am envisioning for my new big box.

• 510
• Variable Voltage
• Led Voltage Readout
• Driven by 2 26650's
• A very light switch to control a MOSFET switch

My reason for posting this thread?
I'm wondering if anybody would give any insight, advice, suggestions, ideas, or inspiration that may make this project a little easier, faster, or more interesting (or possibly challenging).

What areas might I run into problems? More specifically, in the VV part. This will be my first VV homebuilt.
What features could make this impressive? I'm open to anything.

I'm a fairly new face around here, so I'll let you guys know that I'm just completing an electronics engineering program up in Canada. So don't worry, if anything you say goes over my head, I'm pretty keen on researching.

I appreciate any input you're willing to give.

And I'm just gonna throw this one out there:
If I decided to ditch the idea of a box mod and turn it into oh, say, a Millennium Falcon mod, or a Cylon Raider Mod, would it be too awkward for an everyday PV?

Thanks Guys

 

[Sicarius]

Just a quick question from my side why Mosfets are so highly regarded for switches. A Darlington would seem to be a more robust device for the purpose .. or am I missing something.

 

[slimest]

On Darlington drops about 1.5 volts, even more. Let's count: 1.5volts x 2A =3 watts to garbage (or to heat your hands). On MOSFET you lose almost nothing - its resistance is about 0,005-0.02 ohm.

 

[Sicarius]

My bad. Forgot about the junction drops.

Back to the OP then. What about a 9v Li-ion with double barrel HV carts at 4.5v each.

 

[nerve007]

I like the double barrel idea... But I'm going to stick with the 26650's only because I already have a few laying around.

 

[TomCatt]

That's gonna be a big 'un!

Here's some converters for VV, they all have how-to threads on here somewhere, just do a search using the names.

http://www.e-cigarette-forum.com/forum/battery-mods/247184-list-mod-coverters-newbs.html

 

[TomCatt]

heh heh, JUST saw this post - sounds like a good setup - http://www.e-cigarette-forum.com/forum/battery-mods/248666-lm2577-fail.html#post4795103


ETA: The post I linked to is on topic but isn't about the LM2577

 

[nerve007]

Sweet, thanks TomCatt. I'll have a look at those.

I'm sure the how-to's are a good reference, but I'm going to try to stay away from them initially. I'm more inclined to look at the datasheet and analyze my way through. I'll understand it better that way so my next mod will benefit.

What types of LED displays have you guys seen used in homebuilt mods?

 

[TomCatt]

Cool nerve!

People here are always on the search for a small LED voltage display; but until then, I believe everyone is using the 1s-6s LiPO voltage meters you can find on eBay.


Sent from my iPod touch using Tapatalk

 

[slimest]

For rough voltage estimation you can use LED indicator with 4 steps, made from, say, LM339 comparator. Very compact and easy to make. Of course if you know electronics.

 

[nicotime]

My current mod seems to be on its last legs, so it's time to make a new one.

Here is what I am envisioning for my new big box.

That is the only thing you need...why go with the flow.....you never know what you may come up with! Good luck!

For rough voltage estimation you can use LED indicator with 4 steps, made from, say, LM339 comparator. Very compact and easy to make. Of course if you know electronics.

Do you know of any schematics for that slimest? Does it have a sharp on/off function of the LED's or does it start out dim and get brighter as the next light starts up? I want something that goes on at the exact voltage...then the same for the next step..and so on.