Lasersaber strikes again. A joule thief king ?

[d3x0r]

For Windows: ScreenshotPilot is my favorite. For Linux: Use gnome-screenshot --interactive. For Macs: Don't you have some  to watch or something?

it's better than the builtin windows function?

[TinselKoala]

it's better than the builtin windows function?

Yes, ScreenshotPilot has nice features, like the ability to select areas or windows rather than just the whole screen.
http://www.colorpilot.com/screenshot.html

But mostly I use the Linux, except when displaying my Link DSO screen which only runs on Windows... 98SE.

[d3x0r]

Yes, ScreenshotPilot has nice features, like the ability to select areas or windows rather than just the whole screen.
http://www.colorpilot.com/screenshot.html

But mostly I use the Linux, except when displaying my Link DSO screen which only runs on Windows... 98SE.

alt-prtscreen - just the top most window ; not the full screen... *shrug* easy enough with paint.net or something to clip subregions  

[Collapsingfield]

Tinselkoala, this in not a competition. Everyone has own results and opinion. In the diagram there is small condenser (20uF) and it is interesting to see with smaller (nano range) to see the behavior of that type of circuit at the full voltage range (0-9V). Burst mode and others are reachable by changing the parameters. My circuit on my desk isn't glimmering. Yes, I tried some version in the mikroamper range with long runtime, but at now I don't like to watch directly in the LED. Don't remember that Lasersaber's last circuit lose its intensity after some minutes with a 56000uF cap!!!

[conradelektro]

You are starting out at 9V or more ! And with a large-value resistor like 10 meghohms....  I'm just shaking my head and grinning. Of course you will get tiny glimmers that last a long time.  Of course you get deep spikes from the inductor.  Don't forget that a capacitor charged to, say, 10 volts has ONE HUNDRED times the energy of the same capacitor charged to 1 volt, since E=(CV²)/2.

I've never charged my version of this system to over 3 volts and mostly I run at _under one volt_ . I even installed a pushbutton bleeder so I can discharge the cap voltage down to where the thing is behaving in a more interesting manner, rather than just duplicating ordinary high-voltage JT waveforms like those shown above.

Here are some characteristic wave forms and pulse trains from my loopstick-LaserSaber system operating at under one volt. Note that this kind of waveform oscillation may be hard to show on a digital sampling oscilloscope.

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


Bursts of oscillation in another low-voltage JT:

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

@TinselKoala: I see, thank you for showing the scope shots. They are very interesting but seem to be different to a JSR Looper.

This is not ctriticism, I just want to find out what Lasersaber's circuit is doing and how other circuits (like your loop stick circuit) behave.

In fact I am more impressed by a circuit who needs less than 1.5 Volt and still lights some LEDs.

To me it seems that a continuous oscillation and carefully selected components will yield a better efficiency to get light from LEDs. I just find the "ringing bursts" interesting.

Greetings, Conrad