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Overunity Machines Forum



Joule Thief

Started by Pirate88179, November 20, 2008, 03:07:58 AM

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MileHigh

#16890
February 21, 2016, 01:23:38 PM
Yes I saw the spikes and it's highly likely that they are coming from all sorts of possible external sources, and not the corroding magnesium.

Pirate88179

#16891
February 21, 2016, 02:09:44 PM
Quote from: MileHigh on February 21, 2016, 01:23:38 PM
Yes I saw the spikes and it's highly likely that they are coming from all sorts of possible external sources, and not the corroding magnesium.

Well, I still like that I can light up all that I have been able to light up for free.  There was no 60 Hz component that I could detect but, I guess it does not really matter where the energy is coming from as long as it is usable right?

Also, my magnesium block still appears to be alive and well after about 5 years...although, to be fair, I have not run lights all the time from it...usually just around Christmas and special occasions.  I am sure that it will give out one day.  The carbon rods are just fine, as would be expected.

Bill
See the Joule thief Circuit Diagrams, etc. topic here:
http://www.overunity.com/index.php?topic=6942.0;topicseen

MileHigh

#16892
February 21, 2016, 02:27:48 PM
If you read Revolution Green a company has what resembles an LED-based camping-style lantern that uses a magnesium cylinder and salt water to power the LEDs.  You get something like 150 hours (if I remember) from the cylinder.

Pirate88179

#16893
February 21, 2016, 02:43:55 PM
Yes, I remember reading about that.  I believe Mark D. also posted a link to that story over here somewhere.

Bill
See the Joule thief Circuit Diagrams, etc. topic here:
http://www.overunity.com/index.php?topic=6942.0;topicseen

Pirate88179

#16894
March 01, 2016, 02:40:02 PM
I still want to know why, when I "tuned" my simple JT circuits using a vr on the base that I could go past the sweet spot and would have to back up?


In other words, if I were just lowering the resistance, then the led would get brighter the lower I went...right?  So, why would the led get brighter and brighter and then start to get dimmer and dimmer and you had to tune back to hit the sweet spot?


This is going back about 8 years but I believe I replaced the 1k base resistor with a 5k vr.  You could tune it to get the best lighting and then, measure the vr and replace with that value resistor which is what I used to do.  But then, as has been discussed, the circuit would drift out of tune as the battery voltage lowered so I ended up just leaving the vrs in place most of the time.


Bill
See the Joule thief Circuit Diagrams, etc. topic here:
http://www.overunity.com/index.php?topic=6942.0;topicseen
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