Joule Thief

[TheNOP]

@TheNOP,  This is what I was trying to say, and you quoted me,  but there's nothing showing up in the box? So I assume it had something do do with transformer action?

really ?
i am sorry.
it have to do with your brainstorming.

the way you explained it was not understandable by me.
the terminology, the words, you are sometime using are not defined the same as in a science dictionary. this is confusing me.

about the base coil/collector coil.
ask yourself what is creating a mag field in a wire and how you can lower or magnify it.
then ask yourself what is the currents passing in each coil and the resistance involved for each.
note: inductances do not have resistance

don't get me wrong, i am not saying both coils do not interact inductively with each other, they do.
simply that that interaction is not what make leds light both ways.

the voltage does not only rise at the collector coils, it rise almost everywhere in the circuit, and since the base coil is in reverse...
that is why the led glow dimmer on one way, it draw the currents that would have otherwise triggered the base of the transistor sooner.

[jadaro2600]

that is why the led glow dimmer on one way, it draw the currents that would have otherwise triggered the base of the transistor sooner.

So, oscillation frequency then changes when the LED is put one way as opposed to the opposite way?

[jeanna]

@All,
Am I the only one who is beset by confusing values and inconsistent results?

I have been filling the gaps in my knowledge of some configurations, and although it is not necessary to go into detail yet, I am having trouble knowing what I am seeing.

So, for instance on one coil today:

The scope says 147v  Now, the shape is such that there is a lot of straight line like no volts or 1.3 volts or something... then a skyscraper then a plain spot and another skyscraper. Maybe 6 skyscrapers in one screensworth at 1.2KHz. So, maybe the net effect is less.

The full bridge rectifier on this secondary pair only sees 30V  OK maybe the skyscrapers have needle antennae and most of them are under 31v.

But the really sad part is that with a pair of diodes and one of those fuji caps I removed from the fujiboards last december, I can only collect 5.8 volts in about 1/2 minute.from the secondary of this jt coil.

What gives here?

Do I need to leave the cap there for a long time? Very long if it is going to get to 100 volts.

Does anybody have any ideas?

BTW the reason for dropping back a bit is because the other day I had a pretty steady series of waves at 120 volts and this did not light my string of christmas leds.

thanks,

jeanna

[Pirate88179]

@ Jeanna and all:

I have been keeping up with our topic here but have remained silent as the research at this point is beyond anything I understand....even a little.  I have some ideas but nothing to back them up so...I will be quiet and let others that know much more respond to these issues.  One point Jeanna with your cap charging experiments, possibly your high voltage spikes (back emf?) are at a frequency that is not appreciated by the caps?  you know, like some types of batteries do not charge well off the Bedini but yet others do with the same output?  Just a guess/thought.  Good work.

Bill

[xee2]

@ jeanna

You should have a small value capacitor across the DC outputs of the rectifier. It will charge up to the maximum output from the rectifier. Without it, you are trying to measure a pulsed waveform with a DC meter and that does not produce accurate answers.