Help: 5 Volts and 510 Atty's

[Huffheinz]

I built a 5v box mod using 2X14500 batteries, the LDO 5 volt, 3.0 amp regulator with control pin and a 510 connector from madvapes. I'm taking it really light on the trigger and dripping a lot to keep the atty wet, but I am just burning the bejesus out of any juice I put in it.

I have a 510 madvapes 5v passthrough, which gives me the perfect hit. I was hoping to get the same hit from my new mod, but it runs much hotter.

I used the madvapes published wiring diagram on the new mod:

The only difference between this diagram and how I wired it is that I put the master switch on the ground right next to the battery.

My 510 atty is measuring 2.3ohms
The regulator is producing 5.3volts (sorry didn't check it under load)

By my calculations (using the info from this thread) this mod is pulling 2.3amps and 12.2watts.

Is 12 watts too much for a 510 atty? Has anyone else run into this problem?

Why is the USB passthrough so nice at 5v but this box mod is so harsh? Is there a current limiter on the USB port of around 2amps? That would produce a 9.2watt draw...

I'm sorry if this has been discussed before, but the search function has failed me.

 

[WillyB]

Why is the USB passthrough so nice at 5v but this box mod is so harsh? Is there a current limiter on the USB port of around 2amps? That would produce a 9.2watt draw...

You answered your own question, because labeling a PT as 5V does not make it so. You would need to check the loaded voltage of your PT to find the true volts you are vaping at (you'd have to build a special adapter so you could attach your meter leads after the switch and before the atty). What current a USB port supplys is up for grabs, but it is obviously less than what your 5V regulated mod provides.

 

[Huffheinz]

Thanks for the reply, Willy.

I'll have to take apart the PT to see what loaded voltage I am getting...that may be rough. But it should be easy enough to check the the loaded voltage on my 5v mod, then check the loaded voltage on my 3.7v mod, figure out the power (wattage) each is using and aim for somewhere in between.

I would like to mellow this puppy out. What is the best way to do that? More voltage regulation? I'm thinking about using a 0.5ohm/5watt resistor on the positive between the regulator and the atty but it seems silly to regulate the voltage coming out of my voltage regulator. Is there a way to limit the current draw from the batteries?

 

[Quick1]

Ummm, I haven't found a PC USB port rated at more than 0.5amps... They are 5v - 0.5amps.

You are doing 5v with a 3amp supply?
5v through 2.2ohms == about 2.27amps and 11.36 watts?
If we assume .5amps with your usb passthrough (v=ir) would the voltage be dropped to about 1.1volts resulting in .55 watts? Is that how that works?

 

[WillyB]

Thanks for the reply, Willy.

I'll have to take apart the PT to see what loaded voltage I am getting...that may be rough. But it should be easy enough to check the the loaded voltage on my 5v mod, then check the loaded voltage on my 3.7v mod, figure out the power (wattage) each is using and aim for somewhere in between.

I would like to mellow this puppy out. What is the best way to do that? More voltage regulation? I'm thinking about using a 0.5ohm/5watt resistor on the positive between the regulator and the atty but it seems silly to regulate the voltage coming out of my voltage regulator. Is there a way to limit the current draw from the batteries?

Not really the reg is meant to take a range of voltages and always output 5.

You could try the resistor or try a diode, which will also drop voltage (at the atty) by about .5- .8V. If I figured right your .5Ω resistor should put you at about 4.1V @ 7.5W. That's based on 5V not 5.3.

RadioShack.com

 

[Huffheinz]

Hmmm...I never thought about using a diode. Interesting...

Well, I've been vaping on it a little more and it has either mellowed out some, or I'm just finding the right (lower nic) juice and learning how to vape with this much power behind it.

Thanks for the guidance, but I think I'll leave it alone for right now and maybe grab some high-resistance atty's the next time I place an order.

I'm still curious about the 510 atty at 5 volts. Has anyone else run into this problem?