Joule Thief

[MrMag]

Actually No if you monitor the voltage while you charge it with 1000 volts and stop at the rated voltage .

Also About the cap not going higher than the source voltage .
Someone Explain why i can take a Jt with a secondary . rectify it and measure the volts output , say 15 volts  then put a fugi cap acrossit and it builds up 3 time as high ? I know  this to be True from experience with them . Is it the Spikes i cannot read on the meter ?

Gadget

Flabbergasted

Yes, it is definitely from the spikes.

[TheNOP]

Hi NOp / Actually it was me that said a cap could over charge not abbarue .

oops
you are right, you was the first to say it.
i was focussing my mind on abbarue suggestion of using a zener diode and ended up giving the credit to him.

sorry about that.

i do agree with you on the danger, even with low voltage.
amps can injure you badly and in some cases even kill you.


you must understand something about me.
30 years have pass since i learned electronic.
some of it, i use from time to time, mostly the troubleshooting part whitch i use regularly.
i do computers repair for others as a hobby, but no other appliances.
well, some of my own, if i can troubleshoot it with only a multimeter.
i did retained most of what i learned, i think..., but fergot some details.
the primary reason why i fergotted some details is that i never made electronic my profession.
the secondary reason is, did i really understood all of what i was teached ?

so i encourage everyone to double check what i am writing, questions about it.
once someone point the detail i am missing, it is easy for me to reconize it for what it is(if electronic terms are used that is).
it is like ridding a bicycle, you don't really completely forget how it work, event after many years.



@all
about measuring with multimeters and scope.

there a lots of cases where multimeters will give you measurements that are "not accurate".

the output of a diode or a diode bridge is not really DC.
it is pulsed DC .
http://en.wikipedia.org/wiki/File:Rectified_waves.png
it is to be expected to see such different result simply because of that fact.
the measurement are averages, if there is no cap in parallel to the source.
this average is still not the true RMS value, duty cycle and rate must also be taken into consideration.
but a cap will charge to the peeks voltage if it is not allowed to discharge.

for scopes i am not sure.
it might have to do with the sampling rate of digital scopes.
meanning the peeks are sometime so fast that some digital scopes can't see them.

[xee2]

@ gadgetmall

Is it the Spikes i cannot read on the meter ?

Yes.

[gadgetmall]

@ All thanks guys .
I am Getting ready for the Big Earth Battery Show in The Black Hills and have most of The Light inventions ready . I'm too tired to snap and edit pictures tonight but i have two units  that's are running 25 leds  on a 12 foot wire drawing 2 ma and running on dead battery's  last i checked the volts were .3 this is with one of My 300 hfe .2 volt germanium's . the other one is self charge assisted and is drawing 9 ma with a standard 2n3904 and 25 leds in a bundle flower . these are all Christmas lights i hacked and soldered in parallel . I also have a Hv camera circuit from goldmine i tuned to 2 ma and its running a bunch of leds also . All this will be tied on one MAx Ultraboost cap fed with the earth battery and My nighttime solar switcher/Charge regulator. ,, I guess i will try and make that 450 mile trip up there for Greg At ARSF Who has Supplied all the Graphs and data logger results and Supplies .  .
The Final Analysis is this . there is Galvanic current and there is Magnetic Current . There is a sweet spot to get the most voltage and the most current . Electrodes placed 20 feet apart produce the Magnetic ley Current and Voltage . 4.8 Volts at a few Nano amps  . Moving the electrodes Close together from one to three feet produce  a maximium of 2 volts and current as high as 15 milliamps with the electrodes we used  . So in bewteen that is your higher voltage and lower current . It depends also on Moisture ,an Doused Ley lines nad material of the Rods . Carbon Fiber Produces more Volts but less Current . Carbon (Pure) Produces the most Current  as does Magnesium . Copper is next .. I know that the mass of the positive electrode increases the current . SO start Getting Some Magnisium Rims . I have the Carbon From The Main World Wide Manufacture who make them for everyone in the world . up tp 6 inches round and 4 foot long . (power) Thats all for tonight ..

Sweet Electric Dreams

Gadget 

[electricme]

@Bill, and ALL.
All last night you guys have been very busy indeed.
I was about to reply on this cap topic (last few pages) when I saw here that Jeanna has stumbled on the answer.

@Bill,
I was reminded today about the sometimes wild fluctuations in an EB.

Today I put the dmm on it and it started at0.024v and continued to rise to 0.101v and when I returned from looking at the scope elsewhere, the voltage was down again to 0.043v

I am pretty sure your cap in this instance would be holding 0.101v because it would have instantly raised its voltage to the high number and without something being there to remove the voltage, that voltage would still be there as it accumulates more amps over time.

The funny thing as I remember is that if there is a load it will pull more, but even without that element, I think this explains that your ground will peak to 2.5v so briefly that the dmm cannot see it, but the cap never lies.

I had this happen with a MK1.
The highest reading I could get on even the scope was well below the amount a fuji cap could collect.

But the cap is not capable of getting any higher than the highest voltage going across the leads.

Someone please correct this if I am wrong.

for what this is worth,

jeanna

Exactly, Jeanna, in the EB case, way back in the Stubblefield forums I mentioned I had seen wild fluxtations in my scope screen, it was a very complex pattern, but its "amplitude" would raise and lower over time, sometimes, it would go at a snales pase, other times it was so fast I almost missed it.

So the Cap or SC just collects the "hi" pulses, whether they are there for a milli second or minutes or hours.
So Bill, if you seem to have a higher voltage in your SC, but your DMM says the EB output, is lower, then the pulses as Jeanna says, just mabe have been so quick the DMM didnt catch them.

If your DMM has a "hold" feature, then you could set it to catch the highest pulse and freeze it.

jim