Joule Thief

[electricme]

@ bill
Mice are loosing, I got 2 on Tuesday, off the glued down cheeze trap.

Not to be out done, the dollop of Peanut Butter is looking much smaller, patience is the key here, and da trap will strike.

I put a sign up 4 the mice to read, warning them about the trap, maybe dey not been to mouse skool?
Pass a new law, mouses must go 2 skool ha ha, noooooo then weel never get em.

Bill I up to post 70, I'm compiling a list of circuits we have all posted, Will post them all on one page when done.

@all

Spent a couple of hours unwinding the primary off my big torid, wow what a chore that was.
But I discovered something courious.
When this winding was put on, it was wound bifilar, just like the juel thief, the wires started in a clockwise direction and went all around the torid, then, they reversed all the way back to the beginning

[innovation_station]

hello all ..

@ jim that is verry intresting ....  bout the jt winding then returning to where it started 


@jenna i used an old  empty wire spool 

thease had solder on them ...

so i built and ran the steel coil jt   guess i will try some steel on the outside of 1    like some of the sm stuff....

do you think the steel will be electric/magnetic ... wound with the jt in an air core unit or mabe we get MAGNETIC ELECTRIC

ONE WAY TO FIND OUT ... 

yep gonna build another air core ..

got a question tho ... do we have amparage ...    more than consumed .... if so then ... we should try to switch some of it .....

TO GET MORE ....

IST

ill post a pic of the iron wire coil ...  i finished the winding and spaced it better all around the coil   tryed a neo did not notice a diff ... all expairments with this coil were done with leds ONLY  i never metered it ... or scoped it 

[nievesoliveras]

@jesus,
Thank you again for a beautiful recap illustration.

There is a change I would like you to make, please. If I understand the drawing that you made on the different types of transistors, the side pictured with the diode symbol is the emitter. The 2N3904 being american made then is reversed from your schematic.

The emitter should be on the upper side, because it belongs on the more positive side of this circuit. The collector connects directly to the negative battery side.

(I personally have trouble with these things because I am dyslexic and have a hard time knowing if I am looking at something in mirror view or straight, so please correct me if I am wrong, but I believe it should be as I stated.)

thank you,

jeanna
...

I think the circuit is okay because the emitter on an npn transistor as the 2n3904 goes to negative. But I will change as you say just to not damage your beautiful way of experimenting. Besides the transistor does not mind if you switch the emitter and the collector connections. It will do its work anyway.

By the way, on a toroid winding, each time you pass the wire through the hole is a turn.

Jesus

[gadgetmall]

@All
  i wound an iron wire coil and replaced a regular 22 turn jt circuit with a variable resistor on the base of a germanium transistor  and it does not work . I tried it as air core  and with a ferrite rod as a core . did not work .i replaced the original 22 turn center tapped toroid and it lit  . i stuck a magnet on it so you can see it is iron wire .

[sparks]

     If you can make the magnetic flux of the core to collapse faster than you built it up your circuit gets a little energy out of whatever collapses it.  In an ignition coil of a car the primary current sets the core up very slowly.  Then they open this circuit and something majical happens.  The wall you just put up gets knocked down.  Now you get back all the work piling up the blocks PLUS the work of knocking over the blocks.   If you have ever done demolition work you will know what I mean.  What force is causing that field to collapse.