Joule Thief

[innovation_station]

i have this cfl driver   anyone know the output of this thing is ....  and if we replaced the input cap and  charged it with a jt will it run ?? 

the cfl curcuit?  and we use the cfl to charge a hv cap ?   


sound possible ?

ist?

[Mk1]

@gadgetmall

I got a feeling the a amplification mag amp because they are used to do so many things, a jt with a pickup coil is it,
If you look at the scope shot by kubikop , on each cycle you got 1 wire one and one switching , so you got constant dc, and ac(pulse dc)
and a out coil its sound so much like a tpu, when you but a neo on the toroid it give it a constant dc so the coil that did that now become a ac(dc pulse )coil so it doubles the switching and time, The toroids are very good at keeping the eddy current in the core i did not think it would give it would generate much on a pelltier , in is lamp is a regular transformer(more eddy current), also pelletier module are also polarity , the earth ground i see it as a negative on a battery giving a level of 0volt bottom , it may be lower that 0 . Hall generator may work better , at some point a toroid with a gcut in it will need to be tested a hall sensor in the hole.

@ist

nice picture , are they a transformer or a magnetron from that microwave ? Have you found the magnets?

And there is a step up transformer in the cfl bulbs, also in the fuji circuit the trigger coil not used by anyone here yet, in the cam circuit it steps up 300v to 5000 v yep that little transformer.


@electricme

The last post from page 237.

[innovation_station]

mk1 

i got this little plasma bulb ...... dont think it uses much power ...  it was my daughters       it burnt out ....   has a real nice hv transformer in it 

glad you know 

i guess if we used the out of the little transformer  through a high freq diode ....   we can charge a hv cap ....   but i think the freq on the cam unit is too low ... 

ist

so i ended up at dollar ramma today ... i found some solar lights ...  a steal 2 bucks each ..    you get 1 aaa nicad rechargeable battery ... a charge controller a solar pannel a super bright led and a cool jt ring holder when your done .... lol

i have 3 of them been playing with them ...  when i get a led real close   {thease are tiny solar garden lights}  to the pannel  i read .7 volts .... wow ... 1 led 

[jeanna]

Hi everyone,

@MK1 I really do agree with you about the mag thing you have found. I think it is right up this same alley.
===
I have some results

Thinking about fuji ckt again, I am curious about the 3 coils being different number of turns. So, I wound a toroid with the same bifilar wires for 5 turns, then continued with only one of those wires til it was turned a total of 12 times. Then I added 120 turns for a secondary.

The circuit is the basic one. 2N3904, 1Kr Resistor at base  4 LEDs in parallel arrangement running off the secondary.

The regular results of this arrangement are:
without the lights it draws 21.8mA
with the lights it draws     24.6mA
   This is new, Once before, when adding lights in parallel, the amps actually dropped.

The rectified voltage in 2 ways with the circuit like this is
42rectified volts
41.1 rectified volts

That is pretty high, I think.

Then,
At the base I added a second resistor 4.7Kr and a cap of different amounts and looked at these results.

First, with the 4.7k resistor added the amps draw became 8.3mA
I tried all the same caps as yesterday and maybe there is a sweet spot. But without all that fiddling, the caps all made the amp draw increase to around 10.3mA

Then I began to unwind the extra winds of that primary bifilar from 12 down to 5 which matches the other wire and so is the usual even bifilar with 5+5 winds.

(the 100pF cap is still || with the 4.7r resistor below the base resistor.)
like so:
5+11=8.7mA
5+10=8.3mA
5+9=7.9mA
5+8=7.5mA
5+7=5.8mA
5+5=6.0mA
5+5=6.1mA

So, the amps draw goes down as the number of turns goes to 5+7 then rises again. 

The rectified voltage with the 5+5 turns has also dropped and is now 
21.4volts rectified and
22.3 volts rectified

So, there you are. Any ideas?

jeanna

[Pirate88179]

@gadgetmall

also in the fuji circuit the trigger coil not used by anyone here yet, in the cam circuit it steps up 300v to 5000 v yep that little transformer.

Umm, if you go way back and take a look at my photos on how I have always used the modified Fuji circuit, the wiring includes the trigger coil.  It always has the way I have it hooked up.  I originally did that just to make the connection to the board stronger (mechanically) but it turned out to be a happy accident.

Bill         ***EDIT***  I do not mean to imply that I am getting anywhere near the 5,000 volts you describe, it is actually closer to 600 which is a lot higher than Josepino was reporting so, I figure the difference must be in the wiring involving the trigger coil, as this is the main difference.  It would be nice to fully utilize that little coil.  Do you think it would stand up to continuous duty as it was designed for very brief, occasional pulses?  I guess we could give one the smoke test.