Joule Thief

[kooler]

mk1
i was just joking about Proposition 65 ...
since i solder all my tests together.. (lead poisoning)

'' WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. ''

http://en.wikipedia.org/wiki/California_Proposition_65_(1986)

[innovation_station]

hey i forgot to post the npn tuner in the TOTAL DARK and man was it dark   


here is that video ...

http://www.youtube.com/watch?v=lK6-sComCNY

and i just finished the 12vdc motor test from npn tuner board video .... 

and i will post the link soon !

thank you

w

[jeanna]

Could you please tell me how to measure ...

Hi freepow,
As Bill said the volts meter needs to be in series with the pos wire to the battery.
So, in other words, get a 1 ohm or a 10 ohm resistor.
Stick it in series with the pos input to your circuit.
I have a 10 ohm.
So, Then read across the resistor in VOLTS and apply ohm's law
E=IR
I=E/R

then divide the volts you see on your meter by the resistor you put in there.
The only problem is this changes what is happening so much I am no longer convinced that it is valid in absolute terms.
I have started to use a half ohm resistor when I really want to cause as little imbalance as possible.

And how do you try to use as little amount as possible of mA's and still light so many LED's

There are a couple of ways.
The best 'learning' way is to play with a cap across the base resistor. This causes an additional repetition of pulses at no cost to the battery and giving a great addition to the output.

The cheap and easy way is to stick the leds in parallel and hope they last.
I am beginning to think they will last because the frequency of spiky volts does not wear them out unevenly in the same way that sending amps through them does.
The cheap chinese flashlight syndrome is that they over drive the leds with too many batteries and connect them in parallel.
What happens is the led that has the least internal resistance will shine very bright then die. This can happen in a few days... or minutes.
I have not seen this happen at all with high frequency hi voltage spikes, and even if it does happen eventually, it will take a whole lot longer.
But I have yet to see a problem unless you use too much voltage to begin with.

So, you might just pop a single led with 14v hi freq.
If you have 4 leds in parallel and throw 14v hi freq at them it will pop all 4.
So, be careful.
I like to start with 3 turns and add turns to very very bright then take one out.
or
Put some in series and check first.

The example of my globe table lamp is that I have 6 leds in series and each one has 3 others in parallel to it so each of the 6 is really 4 which totals 24 lights-worth but the volts cost is what will drive 6.

I made the toroid a long time ago any my memory tells me that I had 48 turns on the secondary.
That is very safe for 6 in series.
8 turns each is very bright but not killer bright, and is made up by having 24 of them.
All on a 10 cent toroid tor-23, with a 2N3904 and a AA battery.

I put a lot of info into this explanation.
I hope it is not confusing.

jeanna

[MrMag]

Could you please tell me how to measure how much mA's a Joule thief uses out of a battery, where do you put the negetive DMM-lead and where the positive DMM-lead goes

Put your meter directly in series with the battery.

[Mk1]

mk1
i was just joking about Proposition 65 ...
since i solder all my tests together.. (lead poisoning)

'' WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. ''

http://en.wikipedia.org/wiki/California_Proposition_65_(1986)

No worry there , btw did they also get rid of fluoride ... major cause of arthritis and some cancer , dull down population ...

Also , i have a suggestion , you could try a flyback jt the way Resonance man (Gary) did it , to load the first cap before the second stage , i am sure it would load the cap real quick, raising the freq of the second stage...

He basically took everything of except the high voltage coil , and wound on some jt coils.

I have 2 or 3 flyback , i will destroy one 

Mark