I'm new and kinda stupid, could use your wisdom here with a USB passthrough.

Status
Not open for further replies.

Ray Manza

Full Member
Jan 27, 2013
17
20
48
Seattle
I've been vaping for two whole weeks and I decided I was tired of waiting for my 1300mah Smoov Rev to charge and decided to build a USB passthrough. Now am I understanding this correctly that when i start with a source of 5V @ 1amps that the effective voltage running my 1.5 ohm dual coil atty is somehow not 5V? I have tested it with my Volt-o-meter and it reads 5V. However a vape on my Rev is a wonderful experience similar to bathing in a pool of silky kittens where as a vape on my newly constructed passthrough device is more like having to wait in line at the grocery store while some old guy writes a check, assuming he can find his check book...

Any pointers?

XOXO

Ray
 

Ryedan

ECF Guru
ECF Veteran
Verified Member
Mar 31, 2012
12,869
19,652
Ontario, Canada
I've been vaping for two whole weeks and I decided I was tired of waiting for my 1300mah Smoov Rev to charge and decided to build a USB passthrough. Now am I understanding this correctly that when i start with a source of 5V @ 1amps that the effective voltage running my 1.5 ohm dual coil atty is somehow not 5V? I have tested it with my Volt-o-meter and it reads 5V. However a vape on my Rev is a wonderful experience similar to bathing in a pool of silky kittens where as a vape on my newly constructed passthrough device is more like having to wait in line at the grocery store while some old guy writes a check, assuming he can find his check book...

Any pointers?
Ray

Welcome to ECF Ray.

OK, so I don't know enough to be able to build a USB passthrough device. Having said that, from what you said in your post, I feel reasonably certain you don't either. Please wait until you have done more research into this before you continue with it. It could be nasty (read dangerous, like fire and explosions dangerous) for you if you get it wrong. If I wanted to pursue this myself, I would hang out in the modders forum on ECF and also do the necessary research on the web so that I understood all that is involved.

Best of luck with it and be safe my friend!
 

KeithB

Super Member
ECF Veteran
Verified Member
Jan 20, 2011
958
212
Annapolis, MD
The problem you're running intp is that a 1.5 ohm carto at 5V will attempt to draw 3.3A; well in excess of the 1A you have available so your target 16.6 watts is going to wind up being about 1/3 of that. If you can find a USB wall wart has a higher output, you'll get closer to what you want. 2A is the highest I've seen but I think some of the Apple chargers are 2.1A. While it still won't get you up to the level you're looking for, you might at least be waiting behind a young lady with a bunch of ones at the grocery store.

Moving to a single coil carto will lighten the load quite a bit, especially if you go to a 3 ohm carto like a SR Boge. It might not work for you if you're a die-hard DCC fan but that's part of the reason I've never liked them myself.

While it'll take you a couple more posts to be able to post in the modding section, you should be able to go do some research in the mean time.
 

markfm

Aussie Pup Wrangler
ECF Veteran
Verified Member
Jul 9, 2010
15,268
45,866
Beautiful Baldwinsville (CNY)
2.5 ohms is as low as you can go for resistance, if you dig up a 2A USB power supply. (5V/2A = 2.5 ohms)

It's highly recommended that people not plug a simple wired USB passthrough into a computer -- a short can cause a lot of damage.

Overall, a 2A dedicated USB supply, like the IQ dual USB 2A supply sold on Walmart online, is a good way to go. http://www.walmart.com/ip/iQ-Power-Dual-USB-AC-Power-Adapter/14690605 Pretty cheap, free shipping if you have it sent to a local Walmart for pickup.

Overstressing the power supply, trying to draw more watts (using too low a resistance) than it is rated for (over 2A, 10W, for the one I linked to), is not recommended.
 

craigsdocks

Senior Member
ECF Veteran
Verified Member
Jan 24, 2013
153
104
Northeast USA
www.craigsdocks.com
Yeah I custom build smartphone docking stations for a business and wall warts while might be rated at up to 2.1amps once they get use and start to warm they dont produce that, thats peak at 2.1amps and will not sustain it, basically when you spike the coil the power will surge to maybe 2.1a if yer damn lucky for a split second then who knows what it is during the pull ... you need a dedicated power supply for that, you know the big ones that sort of look like what you power a laptop with, then you need to make sure its 5 volts and whatever amps you'll need
 
Status
Not open for further replies.

Users who are viewing this thread