This is a handmade iPhone 4s charger that took me around 30 minutes to construct and I don't know very much about soldering or circuitry.
1 - 5V boost converter
1 - 8-pin socket
2 - Power supply capacitor 220uF/6.3V+
1 - Bypass capacitor (0.1uF)
1 - 1/8W 5% 3.3K resistor
2 - 1/8W 1% 75K resistor
2 - 1/8W 1% 49.9K resistor
1 - 1N5818 Schottky Diode
1 - 10uH power inductor, at least 1A current capability
1 - USB type A female jack
1 - 2 x AA battery holder
1 - Circuit Board w/ Schematic
Step 1: Process of Assembling
The first part you will place is the resistor R5 - this is a small oval tan thing with two wires (leads) and color stripes. The stripes are orange orange red which indicates a 3.3K resistor.
Next up you will solder in the 75K 1% resistors R2 and R4. These resistors are blue and have the following stripe colors: Violet Green Black Red Brown. They're very small and easy to confuse with the other blue resistors, but the other resistors have white and yellow stripes so perhaps look and make sure your resistors don't have any light stripes on them.
You will now finish up with the resistors. grab the last two left, these are 49.9K 1% resistors and have Yellow White White Red Brown stripes. They go into the slots R1 and R3.
Step 2: Continued...
The next type of part you'll place is the ceramic capacitor. These are parts C1 and C2.
Next is the schottky diode D1.
Next is the IC socket. This protects the chip and allows you to replace it if there are any problems. The socket goes over the 3.3K resistor but the resistor should not interfere as long as it was soldered in properly.
Step 3: ...
Next is the power inductor L1.
Next are the two electrolytic capacitors. Electrolytic capacitors are polarized and must be placed correctly or the circuit will not work. The longer lead is the positive (+) one and must go into the pad marked with a +.
Step 4: .....
Next, solder in the 2xAA battery holder. The red wire goes to the hole marked + and the black wire goes to the hole marked -.
Finally, place the USB, plug in your batteries, I used rechargeable, and plug into your phone.