Joule Thief

[TheNOP]

Can someone  explain  exactly  what to measure when  tuning  the windings.

the output of a pickup coil.

[jeanna]

I am  trying  it again   with a  diode bridge and  cap 
I will  be measuring  the  voltage  at  both  extremes of my pot . 

Gary,
If you measure across the LED's legs you will be limiting what you see by the limits of the led.

If you wrap about 7-10 turns around the toroid as a temporary secondary. you can use that. Put that on the ac leads of the bridge and collect the + and - into a very big cap. I am using one from the fuji camera that I had cut off. It is capable of 300v and I have been producing about 110v in my smaller MKx's.

I am about to do this very procedure with a MK_2x primary just to tune it.

jeanna

[resonanceman]

the output of a pickup coil.

Thanks TheNOP

That makes sense .

I was  trying to avoid  adding  a  secondary at this time .


I  guess  I will have to .



gary

[resonanceman]

Gary,
If you measure across the LED's legs you will be limiting what you see by the limits of the led.

If you wrap about 7-10 turns around the toroid as a temporary secondary. you can use that. Put that on the ac leads of the bridge and collect the + and - into a very big cap. I am using one from the fuji camera that I had cut off. It is capable of 300v and I have been producing about 110v in my smaller MKx's.

I am about to do this very procedure with a MK_2x primary just to tune it.

jeanna

Thanks  Jeanna

I  guess I was to busy  doing what I was doing to  stop and think about what I was doing .

I  have used   a cap  from   a   flash unit  for a while ......I  switched    to a smaller  cap  so it would charge up faster .

gary

[jeanna]

Thanks  Jeanna

I  guess I was to busy  doing what I was doing to  stop and think about what I was doing .

I  have used   a cap  from   a   flash unit  for a while ......I  switched    to a smaller  cap  so it would charge up faster .

gary

I just got 32 volts from the new MK 2x using what was already on the filter. I think it is 19 turns. I usually take them off, but this time I saved myself the trouble. After it is tuned and I have a good look at the frequency on the scope (coming up!) I will remove them and make a MK1 wind with what was it 80 inches? Maybe 60. I don't have a cap higher than the fuji.

or maybe I do...

theNOP or someone else, If I put 2, 300volt caps in parallel, can I add up what they collect from the bridge to a total of 600v?

thanks,

jeanna