e-cigarette-forum.com • The place for electronic cigarette reviews, news and chat

Go Back   e-cigarette-forum.com • The place for electronic cigarette reviews, news and chat > Modding > Modders Forum > Battery Mods
Connect with Facebook
Register Blogs FAQ Search Today's Posts Mark Forums Read

Notices

Reply
 
LinkBack Thread Tools Display Modes
Old 06-14-2009, 08:09 AM   #11
Super Member
 
nerf's Avatar
 
Join Date: May 2009
Location: DFW, TX
Posts: 338
Default

Quote:
Originally Posted by kalc View Post
Hi Nerf,
I have half a mind to do a usb PT mod, but in this regard i hav a question.
In the mod u hav shown, what happens if the atomiser shorts out?
Normally do all adaptors have current limiting inbuilt?
I don't see how the atomizer would short out on the OEM connector, you're not going to over-tighten it and bypass the silicon insulator, and even if you did most USB hubs are going to have built-in protection. My laptop will shut down the port if it senses too large of a current draw, for example.

As for the built-in current limiting, some passthroughs have a battery in-line, and their design is such that you're not actually using your USB port to do anything except keep the battery charged, you are simply vaping off of battery power.

That being said, I have one of those P/Ts in front of me right now that someone sent to me so I could use the connector to make them one that worked, and as far as I can gather looking at the PCB, it has nothing protecting the battery in the event of a short and uses an unprotected 10440 li-ion 360ma battery. If anything, this would be even more dangerous as a short could cause your battery to discharge at an extremely high rate and explode.

As with everything else in life, use your best judgement based on the best information you have available, if you're worried about a short harming your computer, research the specs on your motherboard or call the manufacturer and ask them.
nerf is offline   Reply With Quote
Old 06-14-2009, 09:07 AM   #12
Full Member
 
Join Date: Jun 2009
Location: Delhi, India
Posts: 72
Default

Hi Nerf,
Yes, i completely agree that it would be even more dangerous with a battery right in front of ones face.
Normally when an atomiser malfunctions, one would expect it to become open circuit, but somewhere in a post i was reading that someone measured a short with a multimeter wit one of his defunct atomisers.
In ur experience with these things, hav u or someone else ever observed a short circuited aomiser when it stopped funtioning?
In my laptop too i hav seen the same feature(by accident though), but i am not sure abt my desktop(havent shorted the usb yet).
The other option is to use the usb adaptors, but since they are so cheap, i am afraid they dont hav any current limit mechanism, which means that the secondary coil will most probably get damaged in case of a SC.
My point is, what abt an LDO with a current limit of somewhere around 1.5A to 2A in the passthrough? Hav u considered such an option?
U might hav a customer here
__________________
kallol
kalc is offline   Reply With Quote
Old 06-14-2009, 09:48 AM   #13
Super Member
 
nerf's Avatar
 
Join Date: May 2009
Location: DFW, TX
Posts: 338
Default

Quote:
Originally Posted by kalc View Post
Hi Nerf,
Yes, i completely agree that it would be even more dangerous with a battery right in front of ones face.
Normally when an atomiser malfunctions, one would expect it to become open circuit, but somewhere in a post i was reading that someone measured a short with a multimeter wit one of his defunct atomisers.
In ur experience with these things, hav u or someone else ever observed a short circuited aomiser when it stopped funtioning?
In my laptop too i hav seen the same feature(by accident though), but i am not sure abt my desktop(havent shorted the usb yet).
The other option is to use the usb adaptors, but since they are so cheap, i am afraid they dont hav any current limit mechanism, which means that the secondary coil will most probably get damaged in case of a SC.
My point is, what abt an LDO with a current limit of somewhere around 1.5A to 2A in the passthrough? Hav u considered such an option?
U might hav a customer here
Kalc,

I just don't really see the need in passthrus, shorts are rare and discovered quickly enough that even if the USB power source you're using doesn't have any form of current limiting, damage should be nil. Shorting out a $2 USB hub for 2-3 seconds shouldn't cause any long term damage to it, and thats as long as you're going to keep that button pressed without getting any vapor.

Adding an LDO would simply complicate construction and raise the cost.
nerf is offline   Reply With Quote
Old 06-14-2009, 10:07 AM   #14
Full Member
 
Join Date: Jun 2009
Location: Delhi, India
Posts: 72
Default

Ok nerf,
thanks for clarifying.
__________________
kallol
kalc is offline   Reply With Quote
Reply

Bookmarks
  • Submit Thread to Digg Digg
  • Submit Thread to del.icio.us del.icio.us
  • Submit Thread to StumbleUpon StumbleUpon
  • Submit Thread to Google Google

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT. The time now is 06:30 AM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.2.0 RC8
© ECF 2007 to 2009 ψ Ω

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184