(yet another) iphone charger
I \'ve seen a lot, but as a road fighter, space/size and weight are critical to me.
It\'s easy to find a 9 volt battery.
I originally made it for my old palm.
There are several resistors and it works on the iPhone. Simple design. A DB-
The 9 ears are cut off from the hood and the ubiquitous 7805 is used as a regulator and a 9 volt battery connector. (
I used an old battery that was harder than the one you bought at Da Shack)
Despite the low efficiency of 7805, it works on a small, easy-to-build basis.
Accessories list: 7805 k SMT resistor for 100 5 V positive regulator (2 pieces)
SMT resistor size 201220 K (1 piece.
I don\'t have 20 K but used 10 K)
Size of 202usb female connector (
I destroyed a device to get my device)
9 V battery connector (
I got my battery from the old battery and it worked best for me, and there were fewer batteries in the landfill)
DB 9 Hood plastic for easier modification, welding, heat shrinkage, filling compounds (optional)
Tool: wire clamp/strippersRat tail fileDremel (
I used the milling machine though, but it was a bit overdone)Soldering iron (
Hot air SMT with paste works best, but I didn\'t dig these things for such a small project)DMMex-
Acto knifeOn with the show!
Collect your things.
I didn\'t take pictures of the tool (should I? )
USB connector: Pre-weld the pins that will be used to weld SMT resistors.
I did this far away so as not to untie it later when welding on the wire.
I also broke the PCB mount lugssoldder on the resistor.
A good set of tweezers will help a lot.
I have a pair that opens when squeezed;
So they will naturally hold an item.
I added one on one side and then one on the other.
The interesting part is to put them on pins.
Do not touch the resistor with an iron, just pin the USB connector to let the melted solder paste flow at the end of the resistor.
The order seen from left to right.
100 K 20 K and 100 K (
Remember I used 10 k but I would recommend keeping 20 k)
You should test it once it\'s done.
There is DMM on Ohm, the test between pins 1 and 4 should be 220 K /-
Cumulative tolerance of 3 resistors.
If not, it\'s a problem.
Wrong resistance or bad solder joints.
File, 7805 of the radiator is used between the screw columns of DB 9I if needed, using a rat tail file. Just a note. Its copper (
Some may be aluminum)
So it will jam the files very quickly and have a file card that will facilitate the cleaning of the files.
Trim the 9 v connector to fit properly in the DB 9 cover.
Rubbing on sandpaper or files works well.
Evenly removed from both sides.
Also trim the cable end of the Hood to install the USB connector.
Documents or heated
Acto blade works fine.
Dremel can also work, just need to tidy up the corners later.
Dremel will also cut off the ears very well.
Take each one slowly and keep testing to get the best.
If you don\'t use the filling compound, a little \"catch\" on the hood helps keep things in place.
Weld the 9 v connector to 7805.
Trim the pins 1 and 2 in 7805 and curved return pin 3.
Pin 1 is 9 V-in 7805 pin 2 is negitive (
Common or 0 V or land name method)
Pin 3 is the output of 5VDC and now add the Heat Shrink tube to the wire, and Weld to USB connector USB pin 1 = 5 DVCUSB pin 4 = GNDShrink add some heat shrink tubes to pins 2 and 3 respectively via USB connection 7805 and bend if any.
Tuck the guts into the hood and close.
At this point, you can fill the cavity with the filling compound. (
If testing with JB weld, epoxy or other temporary filling compound is used to ensure that no power is turned on during drying/curing! ! )Charge away!