Joule Thief

[jeanna]

True, and it is not as bright.
It is OK though.
The 10 watt is very pretty but not bright at all.
I could probably take 3 pix of 3 cfl's on the same circuit, because I started with the wrong light and finally found the right one. But the 20w will give you the best light of course and it seems like a real light, but not the same as from the wall. I would say if the 20w shines about 20w worth of comparative light while the 10w is more like a 7w bulb.
So, it is like an incandescent of the same wattage.
I just took some pix and I will resize them and add them... (1k words  )

jeanna
edit
1- 10w plugged in. This light nearly burned my hand like a filament bulb from the 30 seconds in the lamp!!
2- 10w from toroid. cool. It would be brighter if it could get warm, maybe a cap etc.?
3- 19 warm LEDs LOA bulb. These are straw hats and there is a capacitor in them... get a little warm.
4- 13w cfl from toroid (definitely brighter than 10w)
5- 20w cfl from toroid. (appears to give same brightness as 13w)

[guruji]

@ guruij
Here is the circuit just the core is different then a normal jt circuit. I also remember i had some trouble winding it the right way. I find out more about that when I make the bigger ones. I want to see if there is a difference in winding it north to south or south to north or starting in the middle.

@ sptrue
About the Rodin coil, I made one and placed 2 collectors on it (one outside and one in the middle) then i wound a coil like a toroid over it. I haven't hooked it up yet, I'm waiting for some parts to drive it.

Back to some reading allot of post in one night (night for me )

GrtZ

Hi Gilobob what battery voltage are you using to this circuit? 3v? or 12v?
Thanks

[jadaro2600]

Hello all, I found some LED Christmas lights at walmart.. just hooking them up to the JTC, only have the chain lights up, if I reverse the polarity, the other half does.  I'm using a basic jtc with no secondary.

I'm thinking there might be a diode at play here on the chain somewhere

Anyway, it's got a 2.6V source and is using about 80ma behaving like it is.  I think voltage across the cap at the base is like 160V unloaded.

[innovation_station]

thats quite intresting

jadaro2600

lol   any idea on the freq... cuz all ya need is to make it flip flop at your will for your 2nd freq tuneing .. but we need the freq to be .. cfl .. 38.xxx  whatever it is ..   get this it gets real close to what i think the sm17 might be ....

ist

[jadaro2600]

thats quite intresting

jadaro2600

lol   any idea on the freq... cuz all ya need is to make it flip flop at your will for your 2nd freq tuneing .. but we need the freq to be .. cfl .. 38.xxx  whatever it is ..   get this it gets real close to what i think the sm17 might be ....

ist

1.44kHz across C-E, or so, the performance severely degrades when I try to measure across the B-C.

In order to be on the same track as you all, I would have to wind another toroid with a secondary.  I'll have more free time after the 12th.