Joule Thief

[jadaro2600]

@ jadaro2600

What happenes if you remove the center tap connection and the two capacitors from the upper coil? I would think this would be a standard JT with a pickup coil then. Does your circuit work better than a standard JT?

Well, this is a secondary.  And yes, it seems to generate more voltage with the setup above than without the center tap.  The gains are minimal, but this may have something to do with the capacitance of the capacitors.

It's odd that adding capacitance to the secondary increases the voltage gains.

edit: to explain the peculiarities a bit more, there is a prime capacitance which seems to perform best, very small capacitance values degrade the voltage, and very large ones do this as well.  But not having them shows no gains, just as well, adding them at the right capacitance seems to increase voltage, albeit- this is acting like a voltage splitter with respect to the coil as a whole, but since it's center tapped, it's acting in it's own right.

I may try adding some diodes to further the readings and see if one-way flow alters the setup any.

[kooler]

i got some of those toko coils and the best i could with a jt setup was 80 volts out with certain transistors..
the chilliqueen circuit works better for volts out but it comes with a cost.. more ma's draw

what i did one day once i got bored was rewinded the sec with 36 awg.. that boosted me to 246 volts thru a bridge i didn't put the scope on it


robbie

[jadaro2600]

i got some of those toko coils and the best i could with a jt setup was 80 volts out with certain transistors..
the chilliqueen circuit works better for volts out but it comes with a cost.. more ma's draw

what i did one day once i got bored was rewinded the sec with 36 awg.. that boosted me to 246 volts thru a bridge i didn't put the scope on it


robbie

I've been at issue with the circuit you mentioned, my eyes are going, perhaps I'll try it again.  I've been having trouble locating printed circuit diagrams ( place is a mess ).

The best voltage I'm getting out of this is 26 Volts, it's drawing about 20Ma not lighting anything though.  without the setup I mentioned, it's only getting 22.  It's gaining 5 Volts with the capacitors arranged like they are though.  Considering the difference, I thought it worth mentioning with regard to the prefabs I've been using.

[kooler]

do you want me to get my schematics that came with my toko coils and scan and post

let me know


edit i just found your picture

http://www.overunity.com/index.php?topic=6123.msg227453#msg227453

[innovation_station]

the words of my past become the words of your future! 

this is my grand father ...

in this video .. 

MUCH RESPECT!

http://www.youtube.com/watch?v=oo8N3BagXAc

all because i like to see the blossom then the apple ...   

and no we wont leave fur boots out of this script!

: )

thank you !

im simply doing it all agin in real time ..


im growing a TRUTH TREE!

W