Hi! I'm new at Instructables and i want to present my first and simple project: a powerbank for cheap. Sorry for my English, i'm Italian :) Thank you for joining this project! Really Appriciate! :D
WARNING! I'M NOT RESPONSABLE OF DAMAGING EXPENSIVE EQUIPMENT WITH THIS INSTRUCTABLE. BE SMART. IF YOU'RE AFRAID OF DOING THIS DON'T DO IT!
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Step 1: Step 1: Preparing the Components
The components that you're gonna need are:
-1 9V transistor battery
-1 LM7805 or LM340t-5 Voltage Regulator (this method will not work on iPhones!)
-1 Toggle Switch (whatever you want)
-1 5mm LED (any colour will work)
-1 1kOhm resistor (possibly small dimensions)
-1 USB Female Port (Extract from any broken USB object!)
-1 9V Battery clip (Extract one from a dead 9V battery)
-Wire, (30AWG will work just fine)
Step 2: Step 2: Prepare Your Instruments
That's the instruments that's you're gonna need:
-Soldering Iron (Preferible with controlled temperature)
-Lead Solder (60/40 Rosin Core)
-Pliers (so you're not going to burn while holding wires)
-Helping Hands plus Magnifying Glass
Step 3: Step 3: Connect Everything As Described (see the Pic for Reference)
step 1: connect the positive of the 9v clip to the left pin of the LM7805 (facing up)
step 2: connect the negative of the 9v clip to the middle pin of the LM7805
step 3: connect a piece of wire to the right pin of the LM7805 (it's the 5V rail)
step 4: connect a piece of wire to the middle pin of the LM7805 (it's the negative of the 5V)
step 5: interrupt the 9V line and put the toggle switch between the +9V from the battery and the +9V of the regulator
step 6: connect an LED to the +5V and common ground
step 7: solder the USB female according to the scheme (short the two data lines)
step 8: pack everything in a container
Step 4: Step 4: Encasing Everything in a Case
i just add mine in a old broken powerbank case, perfect fit! you can use a plastic box or a small project box. Mine is a mess, but it counts the estetic :) Now Flick the Switch! if everything works, the little LED light should light up. if not, doublecheck the connections.
Step 5: Step 5: Test Everything Before Trying on the Real Thing
Before trying to charge the phone, check the voltage and the amps with a multimeter. The specs are:
Voltage: about 4.91 to 5.01volts
Current: about 500 to 700mA (mine is 380mA because the battery is low on charge)
Also test with a cheap USB thing, like a LED light or a really old phone. i'm testing with an USB scale
Step 6: Step 6: ENJOY!
Thanks a lot for following my projects, you guys are awesome!