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[jeanna]

For example.
If you lit an LED with two AA batteries, it would not last NEAR as long as a LED on a JT circuit.

Unfortunately, this is not so. 
Many years ago I made a bunch of LED light circuits that were made of 2AAA, a 47r resistor a white or a yellow LED and a switch.
The yellow ones lasted 6 or 7 days and once I timed one of them to 32 hours straight.
The white ones are so incredibly bright that even though they are almost out, they will be visible as night lights for 60 DAYS. [unbelievable, but true.]

It would be a very sweet thing if a jtc could do this for as long, or even half as long since it is only using one battery. [... and the reason I am intrigued by kooler's circuit with the series inductors...]

The jtc circuits in general seem to keep running for 10-15 hours if they are putting out good light and using a AAA. (remember, the longevity test on the plain dc circuit was done with a AAA.)
IMO the jtc can do the impossible, which is light a led on very low voltage and mA; but, the battery leakage caused by the transistor is very significant.

I am saying this not to be discouraging, but I think it is important to realize this limitation.
It is why I like those magnesium/copper galvanic batteries so much.

I think using a very large cap with one of those might be THE great answer, because it could accumulate and push out more in the jt pulses  than the galvanic battery can in a steady stream.

Carry on. I like the promise of the large cap, too.

jeanna

[Taylor1992]

I took Lidmotor's rheostat idea, and applied it to my JT circuit right after I got done playing with your CFL circuit. (I'm assuming that you are indeed the same person I watched on Youtube) The led is lit even at the lowest setting.
So I replaced the rheostat with a 22 ohm resistor, and used a 1k ohm resistor in the standard JT circuit with one of those clamp on toroids found inside Televisions, and it has run for over two days off of a 1200 mA NiCd battery. The current draw is at around 12mA. I had to break out the analog meter, as the digital cannot register any current flow at all.

[Pirate88179]

Here I have to respectfully disagree with Jeanna in that my JT running with a ferrite bead has now crossed over the 500 hour mark lighting a 10 mm ultrabright led from a "dead" single AA battery.  My Mom is still using this for a night light to find the bathroom.  It is still very bright.

Now, if I used a new lithium battery, I wonder how long this would last?  So far, I am more than happy with it.  It is just a basic JT circuit but instead of a toroid, I wound a ferrite bead.  I have an old video of this design on Youtube.

Bill

PS  It might be important to note that my Mom only keeps this on for about 10 hours/day (actually night) and then it is shut off.  So, possibly, this gives the battery time to recover and bounce back a bit?  I do not really know.  I only know that when I check the brightness of her light every night before saying goodnight to her, it is still very bright and I am still on the original battery for over 2 months now.  The off time might be a clue here and it is not the same as leaving it on for 500 hours straight.

[guruji]

Hi guys with that cap how can I hook it to 12v battery bank?Maybe with quadropler? Who knows?
Thanks

[nievesoliveras]

@taylor1992

Welcome!
Now the capacitors are higher.

ultra-capacitors, ebay, $59 plus s/h. 3000 Farads at 2.7 volts!

Thank you lady @jeanna!
Thank you @pirate88179!

@guruji

Dont connect a 2.7 capacitor to a 12v source. An explosion might occur.

In general:
It is a pity that I spent all my money on driver boards, mosfets, xtal crystals...
Now there is the opportunity to buy a good capacitor at a fair price and my money is gone.

But do not despair, it is on my extensive wish list.

I do expect that something good for the community come out from our group efforts.

Jesus