Flashlight With No Batteries

by brunoip in Circuits > LEDs

77227 Views, 215 Favorites, 0 Comments

Flashlight With No Batteries

DSC01448.JPG
DSC01453.JPG
DSC01445.JPG
DSC01456.JPG
DSC01452.JPG

This is a simple method to make a flashlight that will last forever.
It uses a small stepper motor to generate energy and many capacitors for keep it stored for several seconds.


Ps: I'm from Argentina so let me know any grammar mistake.

Materials

DSC01207.JPG
DSC01211.JPG
DSC01222.JPG
DSC01229.JPG
DSC01230.JPG
DSC01302.JPG
DSC01310.JPG

Most materials are recycled from the trash.

You will need:
  • Two LEDs, with their silver led holdres.
  • An unipolar stepper motor with its reduction gear.
  • One or two broken PC motherboards, to remove the capacitors.
  • Two 220 ohm resistors.
  • A sheet of cardboard.
  • A small piece of plastic.
  • Plastic spacers.
  • Four rectifier diodes.
  • Spray paint.

Prepare the Capacitors

DSC01232.JPG
DSC01233.JPG
DSC01235.JPG
DSC01237.JPG
DSC01239.JPG
DSC01241.JPG
DSC01311.JPG
DSC01315.JPG
DSC01316.JPG
DSC01317.JPG
DSC01324.JPG
DSC01319.JPG

The key to the lantern is to put capacitors in parallel to be interpreted as one large-capacity capacitor.
I use 40 capacitors of 1000uf 10v.
If you use more capacitors the torch will stay lit longer.

Solder four rows of 10 capacitors each one.
Then solder the rows together.

Make the Carboard Case

DSC01254.JPG
DSC01257.JPG
DSC01261.JPG
DSC01263.JPG
DSC01265.JPG
DSC01268.JPG
DSC01271.JPG
DSC01273.JPG
DSC01274.JPG
DSC01277.JPG
DSC01279.JPG
DSC01281.JPG
DSC01282.JPG
DSC01285.JPG
DSC01287.JPG
DSC01295.JPG
DSC01296.JPG

Draw the box on the cardboard.
Trim the excess parts and fold by the lines.
Paste a strengthening in the areas where the motor will be attached.
Use double-sided tape to close the box.
If your cardboardis very hard use scotch tape to keep it closed.

Use the pdf file attached as a guide.

Downloads

Paint the Cardboard

DSC01348.JPG
DSC01350.JPG
DSC01352.JPG
DSC01353.JPG

Paint the cardboard to make it look better and be more resistant to moisture.

Prepare the Motor Connector

DSC01300.JPG
DSC01299.JPG

Solder the four diodes to the contacts of the individual coils of the motor in the male connector and a small piece of wire to pin cable which connects the common of the four coils.

Finishing the Inside

DSC01327.JPG
DSC01329.JPG
DSC01330.JPG
DSC01334.JPG
DSC01335.JPG
DSC01337.JPG
DSC01357.JPG
DSC01358.JPG
DSC01359.JPG
DSC01361.JPG
DSC01372.JPG
DSC01371.JPG

Solder the output of the four diodes to the positive of the capacitors and the wire to the negative.
Solder two pieces of wire on the opposite side of the capacitors.

Then insert it into the box.

Leds

DSC01394.JPG
DSC01396.JPG
DSC01399.JPG
DSC01402.JPG
DSC01404.JPG
DSC01408.JPG
DSC01412.JPG
DSC01416.JPG
DSC01419.JPG
DSC01421.JPG

Cut the plastic about the size of the top.
Drill two holes for the led holders and paste.
Inset leds, solder two resistors in the positive terminals of the LEDs. Solder the negative together.
Then solder the wires coming out of the box and paste the plastic to the cardboard.

Attach the Motor

DSC01377.JPG
DSC01378.JPG
DSC01379.JPG
DSC01380.JPG
DSC01381.JPG
DSC01382.JPG
DSC01383.JPG
DSC01387.JPG
DSC01389.JPG
DSC01391.JPG

Use a zip tie to attach the motor to the cardboard box, remember to connet it to the capacitors.

The Handle

DSC01431.JPG
DSC01432.JPG
DSC01434.JPG
DSC01435.JPG
DSC01437.JPG
DSC01439.JPG
DSC01441.JPG
DSC01443.JPG
DSC01442.JPG

Use a small piece of plastic and hte spacers to make a handle and paste it strongly to the motor gear.