Instructables
Picture of Backpack Generator
Have you ever felt your Backpack shake too much and wanted to do something about it?Well now you can charge your phone by all those shakes!
 
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Step 1: Parts

The required parts are-
1. Magnet wire
2. Plastic tubing and caps
3. Foam
4. USB power cable to device
5. Wire
6. 5 diodes
7. Magnets

Step 2: Coil

Picture of Coil
On the plastic tubing attach a piece of foam,and then start coiling the magnet wire.Remember to coil in only one direction,after coiling a length of 3-4 cm bring the wire back to he start and continue coiling. Do not coil backwards.Coil to a depth of 1 cm. Depending on your choice make 2-3 coils.Attach foam on both sides of the magnet.Place the magnet in the coil tube and seal the tube so that the magnet does not come out.

Step 3: Charger Link

Picture of Charger Link
Now cut the charger wire and skin the 2 wires inside.The red wire is positive while the black/white is negative.

Step 4: Rectifier

Picture of Rectifier
To make the rectifier follow the schematic. Preferably solder the diodes to make the connection.

Step 5: Connections

Picture of Connections
Test the polarity of the coils using a voltmeter.Now connect the coils such that the positive terminal of the first connects with the negative  terminal of the second and etc.Attach the starting and end terminals to the rectifier as shown. Take the output wires of the rectifier and connect it charger.

Step 6: Enjoy!!

Picture of Enjoy!!
Full-wave_Rectifier_with_Smoothing_Capacitor (1).gif
Enjoy showing off with the new backpack.Be the new tech advanced kid in school. Charge your iPod just by shaking your bag!!
greintsma1 year ago
I find this not very clearly written, what is meant by 3-4 cm length and then 1 cm length? do you mean to say 1 cm deep?

You should break this down into more steps with more photos and include a slightly more detailed description please.
chandrahas aroori (author)  greintsma1 year ago
Sorry and thank you for noticing I actually meant 1 cm deep.
Don't worry, I understood what you meant! LOL!
wfarnham11 months ago
in your parts list you say 5 Diodes but you use 4 diodes and a capacitor in your Bridge Rectifier schematic.

Do you have any specifics on the kind of Diodes and the kind of Capacitor.
Any ideas about aligning the tubes? I mean do you just throw them into the pack or attach them somehow? Do you align the three tubes along different "axis?

I wonder whether using springe (from one ot both ends of the tube to hold the magnet) would improve performance, since the magnet would always be close to the coils. The question is, would the gained energy harvested from smaller shakes be worth what the springs would cost, energy-wise?
chandrahas aroori (author) 1 year ago
Yes if wanted you could!
are shake generator backpacks a thing now? this is pretty cool, you should power some speakers with that!
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