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DIY-Power-Bank.md

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DIY Power Bank

At the heart of this power bank circuit, are small 3.7V lithium- ion cells that are salvaged out of old broken lamps about 2600 mAh (milli ampere-hour) each.

Materials

  • LM7805
  • 3x rechargeable AA batteries
  • Input jack
  • Output USB
  • Diode
  • R-220
  • R-10k
  • Connecting wire
  • Red LED

Materials used
Materials used

Power banks can be used to charge cell phones, tablets, speakers, laptops, etc..

Schematic

Schematics of the DIY power Bank
Schematics of the DIY power Bank

Assembly procedure

  • Look for a discarded electronic board.
  • Remove required electronic materials.
  • Level all electronic components.

Removing electronic components from a discarded electroinc board
Removing electronic components from a discarded electroinc board

  • Cut two rectangular boards of plywood measuring 4cm x 10cm. One will be used as base plate, the other will be used as a cover.

Plywood board
Plywood board

  • Cut side covers from plastics, or plywood to cover the edges of your power bank.

Plywood side cover elements
Plywood side cover elements

  • Place all ports (in / out) onto a circuit board and solder them in securely.
  • Solder the red LED into the circuit board.
  • Glue the three rechargeable batteries onto the plywood board.

Gluing the rechargeable batteries
Gluing the rechargeable batteries on the plywood board

Soldering the electronic components

Solder the voltage regulator into the circuit board:

  • Connect the positive side of the batteries to the left terminal of the voltage regulator.
  • Connect the negative side of the batteries to the middle terminal of the voltage regulator.
  • Solder the negative output of the voltage regulator to the USB port.
  • Solder the positive output of the voltage regulator to the USB port.

Soldered circuit
Soldered circuit

  • Coming from the charging port (jack), solder a 10k Ohm resistor to the left terminal of the voltage regulator as positive.
  • Connect the negative outpot of the charging port (jack) to the middle terminal of the voltage regulator.
  • Connect the negative pole of the LED to the negative pole of the voltage regulator
  • Connect the positive pole of the LED with the 220 Ohm resistor and with the positive pole of the charging port (jack).

Final Steps

  • Attach the circuit board onto the base plate.

Circuit board attached next to the batteries
Circuit board attached next to the batteries

  • Glue the side covers onto the plywood cover.

Side covers glued onto the plywood cover
Side covers glued onto the plywood cover

  • Assemble your base plate with the circuit and the cover with the side elements together.
  • Plug the phone cable into the USB and test your DIY Power Bank.

Testing the DIY Power Bank
Testing the DIY Power Bank