Introduction: Multi Purpose Backup/Auxillery Power Supply
This device can be used to power your cell phone, iPod, Nintendo DS, PDA, PSP, wireless router, laptop, or just about any low voltage device.
Step 1: Tools
These are the tools you'll probably need.
-needle nose pliars
-solder & soldering iron
-drill & bits
-dremmel tool(depending on your case)
Step 2: Matierials
-an led(with mounting hardware)
-a 12v sealed lead acid battery
-a transformer and a charge board for the battery
-a chassis mount connector
-1-5 amp fuse
Step 3: The Battery
Thease batteries come in many shapes and sizes, you need to choose the battery for your needs.
things to conciter:
1)Battery size & weight
thease factors can dictate the size of your case and portability.
you need to know the power consumption of the device you are planning on using.
your ipod requires 200ma to charge.
batteries capacity is allways marked on the side, a 1 amp hour battery can safely supply 1 amp for one hour, or it could supply 200 milliamps for 5 hours.
Step 4: The Features
There are many things to add, depending on what you need., the parts described in part 2 are useless without some sort of add on, view the pictures to see my suggestions, then we will get onto construction.
Please note, the first pic is a suggestion on how to lay out the controlls.(how mine is layed out)
Step 5: The Main Circuit
hook it all up in accordance with this diagram
Step 6: Chose Your Add Ons
at the very least you should add a 12vdc out port to your creation
for the battery tester, goto step 7, for the regulator goto step 8 for usb goto step 9
Step 7: Battery Tester
refer to this website:
if you want the three led version,connect pin 9 to positive and only connect the green led to pin 10, the yellow to pin 14 and the red to pin 1
Step 8: Regulator Board
a regulator board is really easy to make, simply chose the voltages you need and put regulators on for each one.
7805 is 5v
7806 is 6v
Step 9: Usb Port(for Chargeing)
This is so you can charge usb devices with your power supply
Step 10: Case Mods
Now all you need to do is drill the nessisary holes in the case to attach all of the components
note, the 2nd and 3rd immages are for an older version of the power supply, this one did not include the charge regulator or the rotery switch.