Joule Thief

[resonanceman]

Gary:

Maybe I missed it in one of your posts and I didn't see it on your drawing but, what battery are you using to power your circuit?  If it is an AA battery, or similar, I was thinking that maybe you could substitute a supercap for the power source and, I am only guessing here, maybe it would stay in resonance because the cap would maintain a constant value as opposed to a battery?

In other words, charge the cap from a battery, and then run your circuit from the supercap.  I don't know for a fact that the supercap would perform in this manner, but I strongly suspect that it might.

Bill

Bill

I did  the drawing to  show the concept .
MOST of what  I have  done with it was with 1 AA battery . 
I now  use 12 V  for my circuits ........same exact setup except  for an extra resistor on the base

You may be right  about using the supercaps .......I am not  sure that it would  work ....... but there is  clearly  something happening  that is not  " normal "  when  charging  a  supercap  with a JT.

I am   on my  way to Gadgets  website to see if he still has some  ultracaps

I can't really afford  them right now ..........but I can't let  you guys  have all the fun 



gary

[gadgetmall]

@all
     Just got back from town and want to give an update to Experiment 2 . the charge cap is 1.498 !!! and the run Bcap is 1.178 test complete . So conclusion on the first half of this experiment is YES there is an Over the unity of the run ultracap . Big time . now i am going to switch them and see if the run cap will go to 1.400 again to match what i started with or higher .
I am also making a replication  exactly like this original jt and try it with two small "supercaps" 4.7 farads @2.5 volts and see if i get the same effect . somehow i dont think so . we will see
Gadget

[stprue]

Sound like great progress gadget.  I will keep my fingers crossed on it working for the lower capacity supercaps.  I have some 10F 2.7v maxcaps so if it works I will relpicate.

Again, great work.

P.S. Do you have any pics?

[stprue]

Gary:

Maybe I missed it in one of your posts and I didn't see it on your drawing but, what battery are you using to power your circuit?  If it is an AA battery, or similar, I was thinking that maybe you could substitute a supercap for the power source and, I am only guessing here, maybe it would stay in resonance because the cap would maintain a constant value as opposed to a battery?

In other words, charge the cap from a battery, and then run your circuit from the supercap.  I don't know for a fact that the supercap would perform in this manner, but I strongly suspect that it might.

Bill

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[gadgetmall]

ok this is a quick replication and Experiment 3 with a duplicate Jt exactly like the other one . using 4.7farad cap charged to 2.5 volts for the run and a dead 4.7 farad with 0.100 of a volt for the charge . This might not be a fair experiment because i had 1 volt in the Ultracap but it will give an idea how a super cap is compared to ultra cap . and its a quick experiment . it too a few seconds to charge  one up with a 9 volt battery
I am seeing the super cap charge up rather quickly as expected . Also i adjusted the current draw of the run to 9 Ma to give these little Scaps a chance /

Gadget