Hello arduino community! I'm an arduino owner for 4 months.
Well, i'll be going for a holiday next sunday (yay!=) and i told myself to make a portable iphone charger.
So, i made some research for a week and i learned something about iphone 5 charging system;
iphone usb has 2 power pins and 2 data pins. these are Vcc, D+, D-, Gnd.
Generally usb devices doesn't really use D+ and D- while charging. But iphone uses those pins to determine how much power to draw from the source.
For fast charging : D+ = 2.2V D-=2.0V
For portable charge : D+ = 2.0V D- = 2.0V
well, i think i could handle fast charging with my 7.4V 1500mAh Li-ion battery. So i bought some LM2575 voltage regulator.
I wasn't very into using advanced circuits (like capacitors, voltage dividers etc. fancy stuff
) so i stuck at the diagram.
i can only see that i have to put 100uF and 330uF capacitors , 1 diode and something looks like resistor.
I don't really understand those things, and i don't even have my diodes (im using a chinese website and shipping takes time)
is there any way to simplify this?
Also, i don't have 330 uF capacitor but i have plenty of other capacitors (100uF, 440uF etc..) does this works like resistors (like series = R1 + R2 , parralel 1/Rall = 1/R1 + 1/R2)
if anything is unclear / or something is missing, just ask! that's all i know about it.
Fun Stuff : Electronics vs Me
Uh oh. Ok then.