Joule Thief

[jeanna]

 
That is pretty funny, Bill.

We have interesting standards here, don't we?

jeanna

[resonanceman]

Hello, yes i tried your cap next to base res, thanks.
I have wound a toroid with single wire of about 50-60 turns then I wound on that a bifilar winding of 4 turns, then i connected the bifilar windings to circuit as you normally do, then with the single 50-60 turn - I connected that only to a led, it lit brightly, but its a seperate winding on same coil but on same toroid, so it must be AC
if so, I cant measure any decent voltage on my multi-meter, yet its lighting a led brightly, any comments???

Freepow

As far as I know the secondarys  or pickups  as we  often call  them  are always AC  ......but there are  different  flavors of AC.
WIth some JTs    if you look at  the secondarys with a scope  you  will see that most of the  waveform is one one side of the line .......that is it is mostly positive or mostly negative .

Like  Jeanna  I am  surprised  that you  did not blow out your LED  as soon as you  connected  the power .
Did  you  try  the LED  both ways ?
It  is possible  that if  your JT   has most of the  voltage on one side and you  lit  the  LED  backwards  with the weak  side .......the  LED might  have  had  an  inhibiting  effect on the strong  side.



gary

[resonanceman]

Hello, yes i tried your cap next to base res, thanks.
I have wound a toroid with single wire of about 50-60 turns then I wound on that a bifilar winding of 4 turns, then i connected the bifilar windings to circuit as you normally do, then with the single 50-60 turn - I connected that only to a led, it lit brightly, but its a seperate winding on same coil but on same toroid, so it must be AC
if so, I cant measure any decent voltage on my multi-meter, yet its lighting a led brightly, any comments???

Freepow

As far as I know the secondarys  or pickups  as we  often call  them  are always AC  ......but there are  different  flavors of AC.
WIth some JTs    if you look at  the secondarys with a scope  you  will see that most of the  waveform is one one side of the line .......that is it is mostly positive or mostly negative .

Like  Jeanna  I am  surprised  that you  did not blow out your LED  as soon as you  connected  the power .
Did  you  try  the LED  both ways ?
It  is possible  that if  your JT   has most of the  voltage on one side and you  lit  the  LED  backwards  with the weak  side .......the  LED might  have  had  an  inhibiting  effect on the strong  side.



gary

Edit

WIth  AC that is even on  both sides   you can light  a LED  the same in either  direction ...... with uneven  AC it will light  best in one  direction

[freepow]

 :)Thanks resonanceman, but how come my digital mm only says under 1 volt AC, and i still cant light my 240VAC 4 watt fluoro with that circuit and toroid winding,  I've have seen some pictures of youtube JT's that show a normal digital mm measuring 700+ AC, yet i cant even know how much i'm getting of this winding that i mentioned, how much AC do you think i'm puttint out???

[freepow]

Here is my toroid winding...