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Overunity Machines Forum



Interesting Higher Powered Joule Thief I just made - Part 2.

Started by Legalizeshemp420, October 25, 2013, 02:47:33 PM

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Legalizeshemp420

October 25, 2013, 02:47:33 PM
I am excited by what I just accomplished but I wish I had the ability to measure the current drawn from the battery and the current that was going to the LED accurately and easily.

www.youtube.com/watch?v=yECaDqKAdX8

MileHigh

#1
October 25, 2013, 04:10:07 PM
There is good news for you.  Because you have the 10 uF cap to stabilize the voltage local to the JT, you should be able to make an accurate current measurement.  Just put your multimeter between the battery and the 10 uF cap and if the digital multimeter display is stable then you will have a good measurement.

If you scope the 10 uF cap voltage before you do that you should hopefully see a near-DC voltage.  That is just confirmation that you should get a stable current measurement.

You could measure the power going through the LED.  The correct thing to measure is power in this case, because of the properties of a diode. To do it you would have to jump through some hoops though, it would be uncharted territory.  Then you compare the power in from the battery vs. the power you are pumping into the LED and get your electrical efficiency.

Did you remove that LED from a heat sink?  I advise you to put it on some kind of a heat sink, even an old CPU heat sink.  It looks powerful enough to burn itself up without one.

MileHigh

Legalizeshemp420

#2
October 25, 2013, 04:18:33 PM
The heatsink is already on it else it would have burnt up for sure (the star shiny behind the LED is the aluminum heatsink).

Lets see what I measure and I know I can read a book with the LED at 6 feet easily in a dark room.

Just measured it and it read 179.5 to 180ma

MileHigh

#3
October 25, 2013, 04:41:27 PM
If the back of that star-like LED substrate is flat and shiny and looks like it wants to be put on a heat sink, then you might want to consider it.  It's possible that you have not yet run it at full power with your JT experiments so be careful.  Don't forget it's a 700 mA part and I will guess that you never ran it with 700 mA DC.  That may require a heat sink.

MileHigh

Legalizeshemp420

#4
October 25, 2013, 04:46:46 PM
Well, that is an interesting effect but I put a flash light bulb (12v incandescent type) in where the LED goes and it slowly revs up in brightness but never goes beyond orange.

Oh, on the LED I did run it at full voltage (power supply) and current and it barely got warm but the 5 watt version does demand a heatsink.
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