Second Stage Joule Thief Circuits

[gadgetmall]

Hi,

Does anyone want to share their favorite JT video link?

I haven't seen many JT videos yet, but this one catches my interest,

http://www.youtube.com/watch?v=GFW1d5G6NnM

What do you think?

Regards,
Paul

we all watched that in the beginning of the Jt thread .that video is from Evil mad scientist for newbe's. It belongs in the other thread . this is An advanced Thread for people that have already built 100's of Jts and can build them with our eyes closed  .

regards
Gadget

[poynt99]

Thanks for answering my questions.

MileHigh made a post suggesting that OU can not be determined unless you make proper measurements. From what I have read, it would seem that these type of measurements have not been performed?

Another thing I would suggest, is to replace your AA battery with another ultra-cap if you have not already done this. One thing that would need to be verified while doing these experiments with capacitors, is the actual capacitance values.

By replacing the AA battery with a capacitor, you can quite easily determine how much energy is being supplied (and later put back with your 5 second recharge), and of course how much energy went into the charge capacitor.

Now, if we go back to Groundloop's calculation:

@gadgetmall,

Your 650 Farad capacitor can store maximum 2197 Joule =  0,61 Watt/Hour at 2,6 Volt.
If your JT did use 13mA/h @ 1,495 Volt, and it ran for 14 hours, then the total input
usage was 0,27 Watt/Hour. The total COP = 0,61 / 0,27 = 2,26.

Congratulations! :-)

With that high COP it should be possible to make a self run circuit.

Alex.

We now know that it needs to be revised due to the 0.5V starting voltage on the capacitor. This is 0.5V in 650F worth of energy that wasn't put there by the JT circuit over those 14 hours, and must be subtracted from the total. At about 81J it isn't much, but it should be accounted for. The COP now comes to about 2.18.

Notwithstanding the 2.18 value, it would be very prudent to replace the AA with a suitable capacitor of known value in order that the precise energy supplied can be derived. A meter on the 1 Ohm shunt may not be accurate, and the current may not be constant over time due to changes in loading as the capacitor charges.

.99

[gadgetmall]

Thanks for answering my questions.

MileHigh made a post suggesting that OU can not be determined unless you make proper measurements. From what I have read, it would seem that these type of measurements have not been performed?

Another thing I would suggest, is to replace your AA battery with another ultra-cap if you have not already done this. One thing that would need to be verified while doing these experiments with capacitors, is the actual capacitance values.

By replacing the AA battery with a capacitor, you can quite easily determine how much energy is being supplied (and later put back with your 5 second recharge), and of course how much energy went into the charge capacitor.

Now, if we go back to Groundloop's calculation:

We now know that it needs to be revised due to the 0.5V starting voltage on the capacitor. This is 0.5V in 650F worth of energy that wasn't put there by the JT circuit over those 14 hours, and must be subtracted from the total. At about 81J it isn't much, but it should be accounted for. The COP now comes to about 2.18.

Notwithstanding the 2.18 value, it would be very prudent to replace the AA with a suitable capacitor of known value in order that the precise energy supplied can be derived. A meter on the 1 Ohm shunt may not be accurate, and the current may not be constant over time due to changes in loading as the capacitor charges.

.99

Hi .thanks for the math but i don't care about COP . Its still overunity . And Its apparent you haven't read from page 996 to the current page on the Jt thread or you wold know these test have already been done .
Regards

[poynt99]

You may call it what you will, OU, COP>1, it's semantics, but I'd rather not get into that can of worms, it's been opened too many times already.

Your diagram shows a AA battery, and there are references in previous posts to using a run capacitor. So what was the conclusion using the run capacitors? You didn't like them, or they didn't produce the effect or result you had with the AA battery? If so, why do you suppose that is?

.99

[innovation_station]

Hi,

Does anyone want to share their favorite JT video link?

I haven't seen many JT videos yet, but this one catches my interest,

http://www.youtube.com/watch?v=GFW1d5G6NnM

What do you think?

Regards,
Paul

yes he has done a great job!!

love the edit!!  plainly tells dozzies how to do it!

funny he repeats eh!  WAKE UP ... I CAN FIND YOU CURRENTLY OVER 5000 YOUTUBE VIDEOS .. i can explain ... 

he's no fool but agin this is NOT THE SAME AS THAT UNIT! 

AS WELL YOU GUYS ARE STILL HUNG UP ON JUNK... 

maybe i should build the gate keeper ... 3 phase ....

my my !

ist

then you use my power can! as a supply  for the gate keeper ..

and you all thought i was STUPID! lol