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MintyBoost USB Charger Kit v3.0

Charge your USB devices on the go with this cute and compact charger!

Steps

Step #1: Gather your Materials

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MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0
  • Check to make sure you have all of the necessary components to build version 3.0 of the Minty Boost.
  • Heat up your soldering iron and wet your sponge, and get ready to start!

Step #2: Insert the 3.3K Resistor

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MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0
  • In location R5, insert the resistor with color code Orange-Orange-Red.
  • Resistors are not polarized, so it does not matter which direction you insert it.
  • Solder it in, and then clip the leads.

Step #3: Insert the 75K 1% Resistors

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MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0
  • In locations R2 and R4, insert the blue resistors with color stripes of Violet-Green-Black-Red-Brown. Be sure to double-check the color code!
  • These are not polarized so it does not matter which direction you solder them in.
  • Solder the leads and then clip the leads.

Step #4: Insert the Remaining Resistors

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  • In locations R1 and R3, insert the resistors with color code Yellow-White-White-Red-Brown.
  • Solder them in and then clip the leads.

Step #5: Insert the 0.1uF Ceramic Capacitors

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  • In locations C1 and C2, insert the two yellow ceramic capacitors.
  • The direction of these components does not matter.
  • Solder them in and then clip the leads.

Step #6: Insert the Schottky Diode

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MintyBoost USB Charger Kit v3.0
  • In location D1, insert the black component with the silver stripe.
  • Be sure to match up the silver stripe with the white stripe on the silk-screened image.
  • Solder it in and then clip the leads.

Step #7: Insert the IC Socket

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MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0
  • The IC socket goes over the 3.3K Resistor, but make sure that you match up the notch on the socket with the notch on the silk-screened image.
  • Be sure that the socket is flat on the PCB, and carefully solder the socket in.

Step #8: Insert the Inductor

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  • In location L1 insert the inductor. It does not matter in which direction you insert the component.
  • Solder it in and clip the leads.

Step #9: Insert the Electrolytic Capacitors

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  • In locations C3 and C4, insert the blue electrolytic capacitors.
  • These capacitors are polarized, so make sure that the longer lead of the capacitor is inserted into the hole marked with a "+" on the silk-screened image.
  • Solder them in and then clip the wires.

Step #10: Solder in the Battery Holder

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MintyBoost USB Charger Kit v3.0
  • The red wire of the battery holder should be inserted into the hole marked with the "+". The black wire should be inserted into the hole marked with the "-".
  • Solder these wires in, and if necessary clip the leads.

Step #11: Insert the Chip

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  • With the notch on the chip matched up with the notch on the socket, press the chip into the socket.
  • Press it all the way into the socket to make sure it is secure.

Step #12: First Test!

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MintyBoost USB Charger Kit v3.0
  • Begin by inserting two AA batteries into the battery holder. Either rechargeable or alkaline batteries will work.
  • Set your multimeter to read voltage, and place the red test lead on the leftmost pin and the black test lead on the rightmost pin.
  • The voltage reading should be between 5V and 5.2V. If not, then check to make sure your batteries are healthy (as well as the batteries in your multimeter).

Step #13: Second Test

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MintyBoost USB Charger Kit v3.0
  • Now check between the rightmost pin and the second and third pin.
  • Your multimeter should measure around 2V.
  • Once everything checks out OK, remove the batteries and continue finishing the kit.

Step #14: Insert the USB Type-A Connector

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  • It should snap easily into place.
  • Solder the four middle pins first and then the two outside mechanical pins.

Step #15: One More Test

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  • Before you start assembling the enclosure, connect the charger to an iPod or other USB-powered device.
  • Make sure that your device begins to charge. Once you know that it is charging, you can build the enclosure.
  • NOTE: The chip will get very hot while charging. This is normal so don't worry about it!

Step #16: Making the Enclosure

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MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0MintyBoost USB Charger Kit v3.0
  • Gather your empty Altoids gum tin.
  • Cut or Dremel two notches in the end of the tin around the area where the flat part ends and the tin starts to round out.
  • Bend this flap back and forth and break it off.

Step #17: Into the Enclosure

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  • Place the pieces of sticky tape on the bottom of the battery holder and on the bottom of the circuit board.
  • It is important that there is no contact between the circuit board and the metal enclosure. This would cause a short in the circuit.
  • Insert everything into the tin and then insert the batteries. Close the tin, and you are finished!

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