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Joule Thief

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

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0 Members and 7 Guests are viewing this topic.

xee2

@ jeanna

Don't feel bad about the emitter - collector confusion. Electronics is very confusing. My vision is not very good and I always need to look very carefully at the transistor to see which lead is which. On top of that, not all transistors have the same lead arrangement so it is always necessary to check the data sheet. As for current flow. Everyone teaches it wrong because Ben Franklin decided that electricity was positive charges flowing through the wires whereas it is really negative charges (electrons). But since no one wanted to correct the mistake we still consider current to be the flow of positive charges. Even though everyone knows that the positive charges in a wire do not move. This is so confusing and stupid, but that is the way it is and there is not much that can be done except try to understand what is going on.



gadgetmall

@All
Here is My Schematic of post 1996 on page 200 of the Jt drawing .71 ma per led running 4 white Leds total current Draw Is 2.85 adjustable down to 1 ma for 4 leds .. I like it . Hope Someone replicates it . I posed before i read your post Jeanna . you might be right on the 68 pico i am not sure either . it is marked 680 ??? One more thing i forgot to mention is the cap across the battery . I completely forgot it and i don't know if it will make a difference or not . i guess i will try it with out the cap across the battery and see if it does anything and report back !!

@Jesus  i bet you could clean up that ugly schematic of mine :) your things are on the way btw ..Edited AGAIN : i corrected the schemitic . it is now correct Symbols and polarity My Transistor is pnp

@Xee . Incorrect . read My post 1996 .
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xee2

@ gadgetmall

I would suspect that the 680 capacitor C1 is not making any difference in the performance of the circuit. You might try removing it and see if there is any change. Your good performance probably comes from the large number of turns you are using.




gadgetmall

@Xee2
No if you read My post you would have seen that the current was reduce drastically by adding the 680 cap . . No one has Done this on a normal Jt circuit to my knowledge . Every Circuit for a Jt on the internet is pulling at least 14ma with 1 led . Jeanna has a Secondary Mod that is As Close .
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Mk1