Joule Thief

[gadgetmall]

Cool . Like i said you can gang some caps together to get it dimmer and then it charges . .Wow my nicad is now 13.03 volts . One Note for you . when you attach a meter lead on the pos the light gets brighter thus the voltage drops . Another weird thing is the negitive lead when touched with a meter probe the light gets dimmer and the voltage increases . So what i do it let it run without the meter attached after the initial increase and later hook it up briefly now . it is getting more sensitive as the battery increase ..

I'll dig thru My lot of germaniums tomorrow when the ole eyes can see clear and see if  we have those for you


Edit yes was typo  1.303 ..

[hoptoad]

snip..
Wow my nicad is now 13.03 volts .
snip..

Is that a small typo, should it be 1.303 volts. ? Or are you running your circuit from a 12 volt battery instead of a 1.2 volt battery ?

Cheers

[hoptoad]

snip...
Mine has climbed to 1.272 from 1.228 and still rising . Not much light on 8 led 220 bulb but the amazing thing is it is a COLD circuit like really colder than the room if i shoot it with a laser thermometer. The other ones ran a few degrees above ambient .
snip....

This is one of the most interesting paragraphs I've read on this forum since 2007. If there is no mistake in your observations, then both the rising battery voltage and below ambient running temperature, pose a very interesting combined phenomenon worthy of serious investigation.
Cheers

[hartiberlin]

Well done Gadget. Looking forward to see more clear videos from you.
Please use a tripod and explain all in detail.
Could also be a longer video if you wish.

@TK,
maybe you should always put preresistors in front of your LEDs and you
your transistors and diodes, so you don´t blow them up....

Also it would be interesting to see to put a "freewheel" at least 1 Watts LED across the primary of the transformer ,(better together in series with a 10 Ohm resistor) to see, how big the Back-EMF spike is there...

Would be also interesting to see scopeshots of the latest circuit from Gadget at all points of the circuit to nail things down.

Sorry, got sidetracked with programming and Wordpress plugins, so experimentation will
start again, when Lasersaber has posted an update movie of his circuit.


Regards, Stefan.

[TinselKoala]

Ah, resistors, they waste power..... but really I've been lucky, I've only blown a few components, not nearly as many as some!  And you have to admit that my components fail in interesting ways....
Sometimes I can even find all the pieces!

I'm uploading a different codec (xvid) compression version of that last "scoping the line" video, Stefan, by your suggestion .... twice as large filesize, estimated 40 minutes for the upload or longer.... I hope it's worth it in quality. If it is, I'll use that from now on unless I'm in a hurry.