Source
r/OpenPV•
Danald2000

Want to create fun little vv Altoid smalls mod.

Hey, I have an altoid smalls tin, and want to create a small and simple vv device. I intend to power it with a 500mah 3.7v lipo battery I have laying around. No interest in making the battery swappable, and was thinking of sanding off one of the top ridges to place the 510 connector on.

My thoughts so far are to take apart an old 510 battery I have and use that connector, use this control board https://www.fasttech.com/forums/2093101/t/1793346/great-little-mosfet-pwm-controller/5 and charge the battery with this http://www.ebay.com/itm/5V-1A-1S-3-7V-Li-ion-18650-Lithium-Lipo-Battery-Charging-Module-Charger-Board-/282238421787?var=&hash=item41b6b88b1b:m:mM_VoxEltZf2E1oR1L4cGJg board.

I have seen some discussions on using mosfets and am wondering if that would be necessary if I were to just use this for cartomizers and other mtl atomizers at lower voltages? Also A little confused on how I would wire the charging board, battery, and voltage control board together. Lastly I would really like to use the button that comes attached to the control board. thanks!

Posted Apr 23, 2017, 10:36 PM UTC · edited

314
TDVapes•

No need to use a fet with this board. Just wire it up. It's not made for low ohms anyway. 1.7 and up will do fine. It's just an ego control board.

If you are going to order that from Fasttech, might as well order the charger from there also. https://www.fasttech.com/product/5054400

2
Danald2000OP•

Thank you so much for the help!

1
Rb8n•

All pwm designs switch voltage on and off, you must keep your build safe for the current limits of your cells as if fully charged and on continuous (unless you know all the ins and outs of sag and pulse -> not advised.)

A small 500mAh cell will usually be a very low discharge rate, do you know it's specs?

You linked the same product on both controller and charger. Do you plan on using a FET or as a traditional high resistance direct drive? There are comments of schematic available and some on supposed current limits in the linked FT forums.

1
Danald2000OP•

Thanks! I know my the current limits of my battery and only plan to use it at ~3.4 volts on carts around 1.7ohms.

Awesome, i fixed the link (http://www.ebay.com/itm/5V-1A-1S-3-7V-Li-ion-18650-Lithium-Lipo-Battery-Charging-Module-Charger-Board-/282238421787?var=&hash=item41b6b88b1b:m:mM_VoxEltZf2E1oR1L4cGJg).

I am lost on the FET question. what do you mean and what do you suggest with the added information?

1
Rb8n•

1.7 ohm on 4.2v will have a peak discharge of around 2.5A. By the forums it sounds like you might be able to get away with direct power without a FET, don't know for sure though.

Wire the board as usual and wire the charge board as normal as well, no worries about trying to pass the current though the charge board. Both would connect to cell plus and minus or "jumper" though one or the other. That charge board looks fairly standard and decently large.

1
Danald2000OP•

so charge board wired to negative and positive leads of battery... and then then the control board as well?

Also sorry for the extremely noob question, but on the linked board I only see 3 wires (battery positive and negative and then positive out), do i need to add a fourth wire for the atomizer?

Also could you direct me to the page where they talk about the need for FETs depending on the amperage?

1
Rb8n•

[Guessed limits] (https://www.fasttech.com/forums/2093101/t/1793346/great-little-mosfet-pwm-controller/5)

As I understand it (haven't read it all or followed links) the board has 3 wires: plus, minus, power out. Plus and minus as well as 510 minus would go to the cell, power out would go to 510 pin, and plus and minus of the charge board would go to the cell as well. Depending on layout the wires could all go to the cell or you could daisy chain the connection like : cell minus to charge minus to board minus to 510 minus and cell plus to charge plus to board plus. It would all depend on space and design limits, all conductors should be capable of 4A and connections should be good physical contact not relying on solder for conduction only for staying put.

The advantage to an ego style board is certain levels of protection, I'm not too sure what protection this had.

Also, understand this is only a 3 voltage selection board.

2
TDVapes•

White wire is center pin of the 510 connection. Red to battery + black to battery - AND to outside of 510 connection.

Wire the charger to the battery - to -, + to + on the opposite side of the board from the USB connection.

2
DIY_FancyLights•

I've heard of my microFET boards being used in an unregulated Altoids box since they are easier to wire into a small space then a traditional TO-220 MOSFET.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=261960134586

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Danald2000OP•

Awesome I'll definitely look into this, thanks!

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bigolddonkey•

Great board from our own diy fancy lights

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