Small Joule Thief

Introduction: Small Joule Thief

I saw a tiny joule thief here: http://www.bigclive.com/joule.htm.  I wanted to replicate the size, but leave the application open for use in different projects.  By following this excellent instructable: https://www.instructables.com/id/Make-a-Joule-Thief/ I was able to fit my circuit inside a 5x5 square of perfboard. It happily powers 3 leds in parallel. 

1 Person Made This Project!

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8 Discussions

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bananagirl
bananagirl

Reply 7 years ago on Introduction

That looks awesome!! Makes me want to go even smaller...Where is the resistor though? Underneath the board disqualifies you from competition(!)

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reopoop
reopoop

7 years ago on Introduction

guys i want to makeone of this but i only have C1815,A1510Y transistor.. and dont know the resistor to use because i dont know the color to choose..

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absolute zero

This is very neat, very clean looking as well!
I was wondering if you remembered where you got your ferrite bead from. I can't seem to find any. Also, I noticed you have only 5 wraps where most other thiefs use upwards of 20, does that effect the performance at all?

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bananagirl
bananagirl

Reply 7 years ago on Introduction

Hi! Thank you! I found the tiny ferrite bead inside a Philips "Genie" 11w CFL bulb. The instructable I followed recommended 6-11 turns on the bead, with 11 being the maximum advised. I used the smallest wire available to me and just squeezed 5 turns. It has been running 3 UV leds in parallel for a few nights now from an otherwise dead battery. Everything seems to work OK, but I'm not really sure how to test performance to be honest!

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absolute zero
absolute zero

Reply 7 years ago on Introduction

Okay, thank you! The only ferrite I have been able to find is much too big, I will continue to scavenge :)