MEG-GA Joule Thief with very long runtime on just 1000 uF cap

[tinman]

And of course, two weeks ago I hooked up a supercap of 10F, 2.7 volts, to my original build of the complete 34063 + inverter "3V Flashlight" circuit as posted in that thread, and showed that it will run, producing light in the LEDs and the "correct waveforms" of burst oscillations and sinus, for long enough to be convincing-- or at least as convincing as Akula's demonstration of the same thing.

http://www.youtube.com/watch?v=vn8kadM61jw

@tinman: notice that my supercap has a full cross X on the top.......   

The wave form i showed was as it is. Here is a scope shot with the blue trace as a current trace added,using a 1.5 ohm resistor between collector and LED. Did you place the full cross on the cap TK ,or is that how it came? All my SC's have a y,and all uf cap's have an x.

[MarkE]

When looking at noisy current senses, one tip that can clean a lot of that up is to turn on averaging.  You should find it in the Aquire / Aquisition menu of your scope.  For things that have a lot of noise like that current waveform 64 or more averages can really make a difference.

[TinselKoala]

The wave form i showed was as it is. Here is a scope shot with the blue trace as a current trace added,using a 1.5 ohm resistor between collector and LED.

Yes, that's a JT-type waveform. Akula did his light trick with a more complicated circuit, though, which, as I showed, does work fine with the charged supercap and continues to make the waveform nicely for a while. A higher voltage SC and initial charge would make the chip version run much longer.

Did you place the full cross on the cap TK ,or is that how it came? All my SC's have a y,and all uf cap's have an x.

Nope, they came that way from EBay. I also have normal electrolytics with the "Y" and even some with a "T" pattern.

[Hoppy]

All my SC's have a y,and all uf cap's have an x.

I too have many ordinary electrolytics with a full X and a SC with no marking, just a plain flat top.

[CuriousChris]

Ahhh Guys you do know what those Y and  X on the top don't you?

In case you are unsure they are put there in case the cap overheats it reduces the chance of a powerful explosion. Wether they have a Y or X or ~ is entirely up to the manufacturer. they do not in any way signify what type of cap it is.

I thought I'd add this in case there was some confusion.