Pages: [1]   Go Down

Author Topic: Homebrew iPhone half amp charger circuit  (Read 219 times)

WA2ISE

  • Member
  • Posts: 1488
Homebrew iPhone half amp charger circuit
« on: December 15, 2021, 02:50:35 PM »

his is a circuit to charge your modern iPhone at a half amp.  Asserting 2V on the data lines of the USB jack makes the iPhone charge at the half amp.   Sure, it will take longer, but it should be easier on the battery.  And if you charge your iPhone overnight, it's fast enough.  Also there's a switch to shift from charging at half amp to having computer access to your iPhone (to download your pictures and such).
Logged

K6BSU

  • Member
  • Posts: 313
Re: Homebrew iPhone half amp charger circuit
« Reply #1 on: December 21, 2021, 04:03:38 PM »

Pretty hard to manage 1/2 Amp when your resistor values are Kilo Ohms!
Logged

N7EKU

  • Member
  • Posts: 1471
Re: Homebrew iPhone half amp charger circuit
« Reply #2 on: December 22, 2021, 05:13:58 AM »

Hi,

I can't see your diagram anymore?

73
Logged
Mark -- N7EKU/VE3

K0IZ

  • Member
  • Posts: 1176
Re: Homebrew iPhone half amp charger circuit
« Reply #3 on: December 22, 2021, 06:34:15 AM »

Sounds to me like a bad idea to solve a non-existent problem.  And maybe dangerous given the phones use lithium-ion batteries. 






Logged

WA2ISE

  • Member
  • Posts: 1488
Re: Homebrew iPhone half amp charger circuit
« Reply #4 on: December 24, 2021, 12:11:45 PM »

Sounds to me like a bad idea to solve a non-existent problem.  And maybe dangerous given the phones use lithium-ion batteries. 
 

Some Apple chargers do this scheme.  Should be fine.  The iphone still sees 5V on the power feed; the 2V is a programming voltage. 
Logged
Pages: [1]   Go Up