This is a Cadillac Joule Thief with six features.
  • Fits comfortably into a pocket.
  • It is built of SMT components on a IC socket platform.
  • It can drive different color and size LEDs.
  • It does Suck a Battery almost completely Dry
  • It will be used to test different brands of AA battery capacity.
  • Yes, it can be used as a Continuity Tester

Sorry, but this project requires advanced soldering skill to build !

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Step 1: Assembled Thief

Picture of Assembled Thief
Bright Pocket Flash Light
  1. Easy to hold
  2. Pointing toward the iCamera
  3. Aim a narrow beam 10' across the room to see the LCD weather station
  4. Close up of LCD station illuminated by a single LED from 10' across the room
  5. LED lightning a tall Victorian ceiling
  6. Detailed component descriptors


Parts you need
  • Small perforated fiberglass board about 1½"  by 3½"
  • AA Battery clip-set and one AA battery
  • A 10mm clear orange LED 36 cdp
  • A Wire-Wrap Socket and a 16 pin solder Platform
  • Two Slide Switches ( You can skip one,  if you don't intend to measure current )
  • Two electrolytic capacitors 100 uF  6.3 V and 100 uF 10 V.
  • Make a 22 mH inductor from the [73K] by unwinding turns & measuring until 22 mH
  • A maxim MAX1675 High-Eff-Step-Up-Converter
  • An MBRD520 SMT schottky diode
  • Two 1206 SMT 470K and a 220K chip resistors
  • Two 0.1 uF SMT capacitors
  • A 100 ohm 1 watt resistor
  • LED socket made from a dual in line 24 pin receptacle
  • Plastic Polaroid Old fixer wipe holder tube

Equipment you need
  • Low end meter that can measure Inductance
  • If things go wrong, an oscilloscope will be handy
  • A band saw or hack saw
  • A box cutter knife
  • A small drill
  • A small Hot-Glue gun

Information you meed
  • MAX1675 PDF ( provided ) useful if things go wrong

Wiring Consumables
  • # 28 gauge Bare wire and low tin lead temperature solder
  • Teflon or any insulating tubing
  • # 24 gauge Bare wire to slid into tubing
  • # 22 gauge Bare wire

beehard443 years ago
i somehow got the idea of making my own joule thief IC...
I like how you made the main part of the circuit detachable
iceng (author)  beehard443 years ago
Thanks :-)
Its for a future light project that I want to make using it....

irlolcopter3 years ago
"They feature a built-in synchronous rectifier, which improves efficiency and reduces size and cost by eliminating the need for an external Schottky diode."
Is a quote from the MAX1675 website.
is it possible you could have a go at tweaking this circuit to see if it could be further simplified?
just wondering
iceng (author)  irlolcopter3 years ago
Thanks for reading the details.
Yes.... it works without the extra diode however
They also say the Schottky diode helps the unit to start at a lower voltage.

Isn't that the point when sucking energy out of a battery ?

could you use it to transfer electicty
iceng (author)  extremeseeker3 years ago
It IS transferring electricity from the battery to the LED
bajablue3 years ago
Voted! ;-)
iceng (author)  bajablue3 years ago
You are very Kind.

I'm approaching a just few bits away from where you
created a healthy serving for my centennial soriee :-D
TheHawkeye3 years ago
Great project. What if you could shrink it into a broach, necklace, or earrings?
iceng (author)  TheHawkeye3 years ago
Thanks for the compliment.
Some time ago some one made earrings that lit and twinkled.
Ingeniously the battery was a button cell on the inside of the clasp.

could you use it to store electricity?
iceng (author)  extremeseeker3 years ago
Only for a few microseconds, it is not the kind of storage device you seek.
This thing works like an other jewel thief, it uses a magnetic coil or coils
to transform voltage and current to suit the LED in the circuit.