Will this work?

[VpnDrgn]

So I am looking at Mamu's VV box mod and thinking, Heck-fire, I can do that; and I had a few thoughts on what I wanted in the box.

On board charging would be a big plus but everyone throws out a lot of tekno babble when it comes to more than one cell. When I seen a 2x18650 battery pack with the pcb & polyswitch built in and already wired with leads, I figured this was the way to go. I checked out the charger and it looks very simple and straight forward. It may cost a few dollars more, but all you would have to put in the box is a connection for the charger, everything else is built into the pack and charger.

I drew up the following circuit and I want opinions on whether I did it right, especially the volt meter. Will it show voltage under load when I screw in the carto?

Let me know what ya'll think.

ps. "LINK", on the drawing, goes to website for main components

 

[WillyB]

I think "Invalid Attachment specified".

 

[VpnDrgn]

I was trying to fix the file, it should work now.

 

[WillyB]

Well as far as the Tenergy pack + Tenergy charger you should try it.

I assume the pack has this in it.

PCB for 7.2V / 7.4V Li-ion 18650 / 18500 7.2V battery packs

Tenergy is not very forthcoming with any info/specs/datasheets. Maybe they will respond to an email.

Just remember.

Put the batteries in fire-proof environment in charging

 

[Java_Az]

So I am looking at Mamu's VV box mod and thinking, Heck-fire, I can do that; and I had a few thoughts on what I wanted in the box.

On board charging would be a big plus but everyone throws out a lot of tekno babble when it comes to more than one cell. When I seen a 2x18650 battery pack with the pcb & polyswitch built in and already wired with leads, I figured this was the way to go. I checked out the charger and it looks very simple and straight forward. It may cost a few dollars more, but all you would have to put in the box is a connection for the charger, everything else is built into the pack and charger.

I drew up the following circuit and I want opinions on whether I did it right, especially the volt meter. Will it show voltage under load when I screw in the carto?

Let me know what ya'll think.

ps. "LINK", on the drawing, goes to website for main components

The volt meter looks like it is switched should be a positive direct to the meter but it should work depending on what kind of volt meter yout going to use. The s1 that most folks are using would work fine. Besides that i dont see any resistors on the LED's here is a calculatorSuper Bright LEDs - LED Information that will give you the proper resistance for your set up. You dont say what kinda charger your going to use. I am guessing a external adapter/charger that is 8.4 volts. Which would work fine although not sure if you would be able to vape while charging without it effecting the charge cycle.

 

[asdaq]

Judging from the battery pack spec description, that should work fine, and the pcb is visible in the pic even. Your 'schematic' could stand some revision though. As for measuring with the carto on, yes that is under load.

 

[VpnDrgn]

The diagram has links ( just click "link" ) for the main components. The "charger connection" has a link for the charger.

The volt meter looks like it is switched should be a positive direct to the meter {I wouldn't think the sequence would matter on a simple open/close switch, but that is easy enough to move }but it should work depending on what kind of volt meter { from Madvapes } yout going to use. The s1 that most folks are using would work fine. Besides that i dont see any resistors { I figured that's a given }on the LED's -- You dont say what kinda charger { universal multi cell charger } your going to use. I am guessing a external adapter/charger that is 8.4 volts. Which would work fine although not sure if you would be able to vape while charging { not looking for PT function, just want to charge without opening box } without it effecting the charge cycle.

Judging from the battery pack spec description, that should work fine, and the pcb is visible in the pic even. Your 'schematic' could stand some revision though. { other than switch on meter and resistors on LED's, what revisions need to be made? }As for measuring with the carto on, yes that is under load. { just so I am straight on this, wired as shown, this will show voltage under load with carto screwed in? With the meter and carto on different paths, how would the meter even know the carto is screwed in? Wouldn't the "path of least resistance" suggest that the current wouldn't even follow the leg that the carto is on? }

I appreciate the help, I know just enough electronics to understand the broad scheme of things. I'll prolly have to get the IT guy to solder this together after I lay it out.

 

[Para]

I know just enough electronics to understand the broad scheme of things.

You've got me beat. I know just enough to get myself in trouble.....that's why I rely on the circuit experts.

 

[VpnDrgn]

You've got me beat. I know just enough to get myself in trouble.....that's why I rely on the circuit experts.

You're not fooling me. I've seen some of the sweet builds you've posted.

 

[asdaq]

I would put the momentary before the regulator board so it can't drain when power is on. Maybe you had this already/
The meter just barely taps into the circuit to measure voltage. Nearly no resistance so the battery isn't strained. With a carto in place, then there is resistance and the battery is doing some draining work so the voltage is lower. Your meter doesn't need to know this, it just reports a lower voltage.

 

[Para]

You're not fooling me. I've seen some of the sweet builds you've posted.

I know a Dremel and I know a file...electronics I don't know. When it comes to circuitry I'm as dumb as a bag of hammers

 

[asdaq]

Heh, I remember electronics in the 5th grade... Now lets see what we get sticking a paper clip wire into the outlet touching a metal chair standing on sheets of paper for insulation....

Too bad it didn't progress impressively beyond that part much.

 

[Java_Az]

I read the schematic wrong i believe( brain fart) . If your wanting a switch to turn the volt meter on and off it is in the right place.

It will only work when the momentary switch is pressed on though. But i am pretty sure thats how you designed it.

 

[asdaq]

Yeah I looked again, the 3 switches are ok, just the meter one isn't labeled and I forgot about the fire switch before getting back here.

 

[VpnDrgn]

So, are we all agreed that the diagram is correct??!

Another question - I seem to recall reading somewhere ( couldn't find it again ) that it is Ok to use a micro switch for the meter, is this correct?
Also, I was looking at some very interesting piezoelectric touch switches last night, but they were only available in 500 to 1500mA, would that be enough for the momentary switch?
What is the minimum amp for the momentary switch? I was looking at some other switches, but they were only 2 amps.

Thanks for the help.

 

[VpnDrgn]

View attachment VV BOX MOD V2.pdf

I have made some changes to my design.
Is there any reason I can't put the master switch on the ground side?
I figured with the master switch open and the momentary switch open, that would leave the charger on a closed circuit. Is this right? Or, does the "power" LED still leave that open?
Now all I need is a unique enclosure for it, I was thinking Carbon Fiber, but further study shows that it is a little dangerous to cut and leaves an unfinished edge. This wouldn't look so good if I tried to build a box unless I can get a perfect beveled edge.

Any opinions??

 

[VpnDrgn]

Does nobody want to chime in on this??