Joule Thief

[Pirate88179]

So, does this mean that Joule Thief circuits are NOT overunity?

Damn!

But seriously, I did leave a comment to Dave on how I achieve "free light" using similar circuits, (using "dead" batteries saved from the trash heap) but that obviously it is not O.U.

Bill

[MarkE]

So, does this mean that Joule Thief circuits are NOT overunity?

Damn!

But seriously, I did leave a comment to Dave on how I achieve "free light" using similar circuits, (using "dead" batteries saved from the trash heap) but that obviously it is not O.U.

Bill

To me increased efficiency is as free as things get.  So if you get x number of lumen hours from a AA battery with one circuit, and x plus y hours with another, then the "free" y lumen hours are what count.  My colleague has developed some insanely high efficiency LED circuits that work with a single AA Alkaline cell but they are commercial developments so I cannot share them.  But he has shown me ~500 lumen hours from an LED driver circuit using one AA alkaline cell.

[Pirate88179]

To me increased efficiency is as free as things get.  So if you get x number of lumen hours from a AA battery with one circuit, and x plus y hours with another, then the "free" y lumen hours are what count.  My colleague has developed some insanely high efficiency LED circuits that work with a single AA Alkaline cell but they are commercial developments so I cannot share them.  But he has shown me ~500 lumen hours from an LED driver circuit using one AA alkaline cell.

That sounds exactly what I was attempting to try.  But, seeing how cheap electronics are from China, packaging and other expenses, I did not see how I could do this.

I wish him good luck as the main reason I was trying to do this was...even though we all have seen what the JT circuit can do...no one I know of has ever marketed a device that can run on a "dead" battery.  I have modified flashlights to run on a single AA bat. that were brighter than the original using 3 AAs.  It would also last longer.  But, bringing something like this to market when you can buy an led flashlight for $2.00 including batteries is hard to compete with.

I have not given up, I am just not as excited about doing this as I once was.  Of course, I could get China manufactures to produce whatever I want but, this would take an order of at least several thousand units.  (Understandably)

Mark, please keep us posted on your friend's progress, or at least, let us know when his product is available.  This would be a great step forward getting this type of thing in the commercial market.

Bill

[synchro1]

Quote from MarkE,

"To me increased efficiency is as free as things get.  So if you get x number of lumen hours from a AA battery with one circuit, and x plus y hours with another, then the "free" y lumen hours are what count.  My colleague has developed some insanely high efficiency LED circuits that work with a single AA Alkaline cell but they are commercial developments so I cannot share them.  But he has shown me ~500 lumen hours from an LED driver circuit using one AA alkaline cell".

The relationship of pulse frequency to LED brightness is the same as voltage. Increasing DC pulse frequency can increase LED brightness the same as increasing voltage. This frequency to luminosity proportion is outside Ohm's law P=V.A. The problem is that increasing LED brightness with higher pulse frequency shortens bulb life. The 500 lumens MarkE is bragging about from his "Secret Source" is probably just burning the bulb out. MarkE posted over 4000 comments in the space of one calender year. He's burning a hole through the forum the same way!

[Pirate88179]

Quote from MarkE,

"To me increased efficiency is as free as things get.  So if you get x number of lumen hours from a AA battery with one circuit, and x plus y hours with another, then the "free" y lumen hours are what count.  My colleague has developed some insanely high efficiency LED circuits that work with a single AA Alkaline cell but they are commercial developments so I cannot share them.  But he has shown me ~500 lumen hours from an LED driver circuit using one AA alkaline cell".

The relationship of pulse frequency to LED brightness is the same as voltage. Increasing DC pulse frequency can increase LED brightness the same as increasing voltage. This frequency to luminosity proportion is outside Ohm's law P=V.A. The problem is that increasing LED brightness with higher pulse frequency shortens bulb life. The 500 lumens MarkE is bragging about from his "Secret Source" is probably just burning the bulb out. MarkE posted over 4000 comments in the space of one calender year. He's burning a hole through the forum the same way!

I doubt that you are correct.  I have many high voltage/high frequency JT's here running in my home now for over 5 years and....guess what?  No led burnout.

I am even using some commercial bulbs in my lights, like the Lights of America 24 chip led bulbs and ...they are just fine with 400 volts at high freq.  My bedside table uses 2 of those bulbs and...I have been using it every night for many years and...the bulbs still work. (still using the original D cell battery also)

Do you have any real evidence to support what you have claimed?

If so, please post it.

Thanks,

Bill