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Old 11-03-2009, 12:41 PM #1
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Default Super Cheap 1.5V DIY Driver!

For the past few days I've been researching in this very interesting boost circuit called the "joule thief" (google it) and done allot of experiments and improvements to make it suitable able to drive red and even violet laser diodes! Right now I am able to get up to 21.7V without a load and 65mA with a phr diode as a load. It pretty much auto-senses the load and adjust the voltage like the ddl circuit. It can drive up to 20 white standard LEDs in series on just one 1.5V cell! It is still allot more work to be done, I just found out that by just adding a another 1.5V battery for a total 3V in-put I could get ALLOT more current to power a phr diode. But unfortunately that was enough current to kill my last one (I've killed 3 phr's in experimenting) by turning up the pot a little too fast .


The driver:

Never mind the resistor poking out, it is for current measuring.


A ferrite core with a pair of single strand copper wire winded 8 times.











Here it powers up to 10 white (with an orange case) LEDs in series on a single 1aaa 1.5V cell:


10 LEDs


5 LEDs



2 LEDs



1 LED






Here it powers up to 21 white (with an orange case) LEDs in series on a two 1aaa 1.5V cells:


10 LEDs


5 LEDs


2 LEDs


1 LED


Close-up of the LEDs powers by 3V









I never adjusted the pot between the different LED groups.


My schematic.


The original schematic from google:



*I am not able to post any current/voltage measurements right now, I need a new DMM.*


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Old 11-03-2009, 01:14 PM #2
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Default Re: Super Cheap 1.5V DIY Driver!

Cool, i built one of those ciruits a couple weeks ago, its still sitting on my windowsill. I had heard about them and built one for the heck of it and then never did anything with it.
Although it looks like now i might have a use for it
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Old 11-03-2009, 02:54 PM #3
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Default Re: Super Cheap 1.5V DIY Driver!

Yeah this thing definitely has potential. I am so amazed how it works!
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Old 11-03-2009, 02:58 PM #4
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Default Re: Super Cheap 1.5V DIY Driver!

Nice circuit find... what type of Transformer are you
using... is it very small..

Jerry
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Old 11-03-2009, 03:05 PM #5
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Default Re: Super Cheap 1.5V DIY Driver!

Fantastic! I might have to jump on board and give this a go as well.
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Old 11-03-2009, 03:40 PM #6
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Default Re: Super Cheap 1.5V DIY Driver!

Quote:
Originally Posted by lasersbee View Post
Nice circuit find... what type of Transformer are you
using... is it very small..

Jerry
It is a hand winded ferrite toroid, I'm uploading pictures now.
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Old 11-03-2009, 04:34 PM #7
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Default Re: Super Cheap 1.5V DIY Driver!

I managed to get 17 winds on mine, i haven't experimented to see whether more or less winds effect performance thou
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Old 11-03-2009, 05:00 PM #8
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Default Re: Super Cheap 1.5V DIY Driver!

I found 8-9 winds to work better. Also the longer core the better, with as thick wire as possible. I spent allot of time making different coils, this works best so far.
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Old 11-03-2009, 05:33 PM #9
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Default Re: Super Cheap 1.5V DIY Driver!

Updated the first post with pictures.
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Old 11-04-2009, 04:21 PM #10
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Default Re: Super Cheap 1.5V DIY Driver!

nice!
i found the joule thief years ago, but didnt thought about how to enlarge it.. :-)

manuel
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Old 11-04-2009, 04:35 PM #11
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Default Re: Super Cheap 1.5V DIY Driver!

I hope this catch on, if anyone has an oscilloscope, please replicate my circuit from the schematic and look if the output is clean. This thing is supposed to oscillate 50 000 times per second with voltage spikes, I want to know if my modifications has gotten rid of that.
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Old 11-04-2009, 05:14 PM #12
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Default Re: Super Cheap 1.5V DIY Driver!

I have access to a scope and know the basics about using it, so if I can find a good suitable toroid then I'd be happy to give it a go. If you need any more PHRs to help with your research, I'd be more than happy to sell them to you for cost price.
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Old 11-04-2009, 05:24 PM #13
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Default Re: Super Cheap 1.5V DIY Driver!

Thanks I might buy a few from you, but first I need to get a new and good DMM, I'm like mutilated without one...

The toroid is from some cable I found, it is pretty common to find on any electrical device with a cable sticking out.
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Old 11-04-2009, 06:10 PM #14
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Default Re: Super Cheap 1.5V DIY Driver!

..are they "full" torroids, and not two halves glued together around the cable?
i know i once had removeable ferrite "clams", like in that picture. two halfs to snap around any cable..

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Old 11-04-2009, 06:16 PM #15
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Default Re: Super Cheap 1.5V DIY Driver!

Mine is a solid one piece, maybe you're right that most are two pieces... I don't know how those will work.
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Old 11-04-2009, 06:31 PM #16
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Default Re: Super Cheap 1.5V DIY Driver!

Quote:
Originally Posted by FireMyLaser View Post
I hope this catch on, if anyone has an oscilloscope, please replicate my circuit from the schematic and look if the output is clean. This thing is supposed to oscillate 50 000 times per second with voltage spikes, I want to know if my modifications has gotten rid of that.
If you want to send me one I'll for sure test it on the oscilloscope on my university
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