DIY iPhone charger

10 thoughts on “DIY iPhone charger”

1. man says:

   July 27th, 2008 at 3:01 am

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

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2. Ben White says:

   July 27th, 2008 at 11:44 am

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

3. samurai1200 says:

   July 28th, 2008 at 11:28 am

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

4. xun says:

   August 27th, 2008 at 11:53 am

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

5. PsRon says:

   April 17th, 2010 at 8:49 pm

   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 :-)

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