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WA2ISE > TECH 05.01.22 01:30l 10 Lines 881 Bytes #999 (0) @ WW
BID : 31088_AL0Y
Read: GUEST
Subj: half amp iPhone charger circuit
Path: IW8PGT<LU4ECL<VK2RZ<W0ARP<AL0Y
Sent: 220104/2327Z 31088@AL0Y.#NNJ.NJ.USA.NOAM LinBPQ6.0.21
A circuit to charge your modern iPhone at a half amp. Asserting 2V on the data lines (the white and the green wires of a USB cable) of the USB jack makes the iPhone charge at the half amp. You wire up a voltage divider circuit to create this 2V, 22K to ground, and 33K to the 5V line. Sure, it will take longer, but it should be easier on the battery. And if you charge your iPhone overnight, it's fast enough.
Get a "lightning to USB" cable (you probably already have one to connect your iPhone to your computer). And wire up a female USB jack as follows:
Pin 1 of the USB type A connector (the kind you see on your computer) is 5V. Pin 2 is the -data line, and pin 3 is the data line. Short pins 2 and 3 together. From that, a 33K resistor goes to 5V, pin 1. and a 22K from pins 2 and 3 goes to ground.
Pin 1 5V ---33K---Pin 2----Pin 3---22K---Pin 1 ground
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