5 Responses to DIY iPhone charger

1. man on July 27th, 2008 at 3:01 am said:

   i need this charger urgently…….what should i do

   http://www.kasheer.co.cc
   http://www.vakaov.co.cc

   Reply ↓
2. Ben White on July 27th, 2008 at 11:44 am said:

   I want to know how to get hold of that charger app!

   Reply ↓
3. samurai1200 on July 28th, 2008 at 11:28 am said:

   this is just voltage division, no? what happens when the iphone stops accepting current? resistors melt?

   Reply ↓
4. xun on August 27th, 2008 at 11:53 am said:

   Thanks! I just modified my 3600mAh USB UPS battery charger to make it work with my iphone 3g, and it’s working great!

   Reply ↓
5. PsRon on April 17th, 2010 at 8:49 pm said:

   It doesn’t take 4 resistors to make a 2-tap voltage divider.

   3 resistors in series, from +5 to Ground:
   +5 to “D-” = 47k
   “D-” to “D+” = 10k
   “D+” to Ground = 39k

   I found that my USB charger actually put out 5.25V (not exactly 5.0V) – but it worked anyway… I got 2.7V and 2.2V measured on my unit, and it went into charge mode fine.

   With 5.0V, these values calculate to give 2.44V and 2.03V output. I imagine many of these chargers are in reality a little over 5.0 V output anyway.

   YMMV

   Reply ↓

Leave a Reply Cancel reply

Enter your comment here...

Fill in your details below or click an icon to log in:

Email (required) (Address never made public)

Name (required)

Website

You are commenting using your WordPress.com account. ( Log Out / Change )

You are commenting using your Twitter account. ( Log Out / Change )

You are commenting using your Facebook account. ( Log Out / Change )

Cancel

Connecting to %s

Notify me of follow-up comments via email.

Notify me of new posts via email.