Joule Thief

[nievesoliveras]

LarryC posted this in another topic.  This is a great litle screen capture program that is free and works very well.  You can do screen capture shots of schematics from videos, etc.  I thought i would pass it on.

ScreenHunter 5.0

This is available from cnet as well as many other download sites.  I loaded it this morning and it works as advertised.
much easier and better than the one I used to use.


Bill

Thank you @pirate I already installed the ScreenHunter you recommended. Now I need to learn how to use.

@all

I made a mk1 style on a ferrite last night, My first real ferrite , So there it is 37 turns pickup coils with 8 jt turns.
The first thing is it works about the same on a broader freq range that is good , but i am sorry the output (22v)is lower then some iron i got.

I also tried changing the jt coil every time i remove a turn , the voltage goes up by 3 volt , until you reach a 3 turn then the effects stops , so by the end i got 36 volts, It work with even 1 turns but gave 33 volts only, I get good voltage out of any type of core because i tune then !
This ferrite also is emitting a sound real cool for a musician to hear a project , because it speaks about the freq , i don't have a scope so it a substitute .

I you can get good result from the pickup coil then tune it , you have to get the right freq, i can not stress that enough! Just use a pot or trimpot to find the right value for the core in the first place! If you lower the battery voltage it all fine but tune the core first!

Also I can't really see a big advantage to this project if cant get the best of the toroid in the first place , 20 ma at 1kh and 1ma at 20kh is the same?

For the recycling bit , solder wick is really nice to work with and a cheap alternative , but you will run out eventually ,
I don't even bother with it any more since some some pc PS need a i think a 75 watt iron to work easy , i only got a 50watt
so, just break the board with a par of pliers to get those toroid .

Have you tried the 1/8 configuration. I mean a combination of 4 turns bifilar and 34 turns secondary. If you do please let us know.

Sorry double post , PC issue , I am going down,lol , messenger down, internet half dead , this side takes like 3 minutes to load a page then try logging in , just got a new one explorer opened about a thousand pages, crap.

Keep the good work, I will be back!

Mark


For screen capture , Just press Ctrl and Prt Scr, Then open paint and select in its window paste and save it any format you like.(windows)

That is what I usually do.

Jesus

[Mk1]

@nievesoliveras

4/34 test results , 2n3904 all 22 awg coils , on ferrite (black ferrite that came from a pc used to be covered by white plastic)1 inch buy .5 inch, With a 1 k resistor 16 volts, tuned with a 20ohms i got 29.2 volts.

Mark

[innovation_station]

guys i ran into a problem with the second transistor that should turn on the cam unit   for some reason it will not turn on the cam .... do i need a diffrent transistor i used a 4401 .. npn   i mesure and it says it is working but maybe it can not handle enough power for the cam ....

what else coulid i use in place of this to take a week signal from the


maybe i just need a seprate photo cell to turn it on as this has become tricky ...

i want it automatic  no manuel switches...

ist!

how would i wire a photo cell into the cam as my primary switch ?

i will post a pic of where i got to with this unit

[jeanna]

guys i ran into a problem with the second transistor that should turn on the cam unit   
...

i want it automatic  no manuel switches...

ist!

Ist,
What if you make the circuit first with a manual switch to prove that all the connections are correct.

jeanna

[innovation_station]

all apears to be correct!!

this is where im at right now....

im gonna use the photo cell ..  a sepreat one i have a bunch but how do i use 1?  as an off and on switch??

ist??