Joule Thief

[WilbyInebriated]

Hi everybody, I've been wondering if this is could be ac and if it is, how it could be lighting leds. i don't think I answered that Q but this interesting.

I just hooked up that string of LEDs to my camera ckt. then I turned the plug around. The brightness changed noticeably.

The plug doesn't have the obvious polarity that some plugs have so, I can't say what the polarity is.

Bill - or anyone else glowing a string of leds-, would you try this, please on one of your strings?

Hmmm,
so is this partially AC after all?

jeanna

if your connection is before the diode then yes it's ac, if your connection is after the diode then it's rectified to dc. that's a rough statement of course. ac can light leds, see this post http://www.overunity.com/index.php?topic=6123.msg145832#msg145832 for a couple simple ac led circuits. always use proper precautions with mains voltage.

[Mk1]

@electricme

Ok it works just as well on toroid but you are limited by space,so far under or over secondary dose not show any difference in output the type of windings and location on toroid will show many different result from good to bad, Playing with the size of the wire permits more windings sine the difference in resistance is not really noticeable but numbers of turn will increase output . I would recommended about 2 to 4 time more then primary. For this part you can experiment with tesla pat 381.970 it permits using 2 joule thief on a single toroid amplifying output when used in a pull push circuit on that one i got from 2 times 2 primary of 12 turn(2 jt ) version and 2 secondary of 48 turns over a coil of each joule thief 2 times(gauge 22) over 30 volts per secondary(so 2 time 30 volt parallel or 1 times series 60 volts).I hope it helps , if not working revise coil polarity i posted a drawing on the early pages of this tread on this forum on the primary windings and circuit i have used for this results.

Using 2n4007 will permit those high voltage spikes to pass thou up to 1000 volts and collect the emf from circuit .  The secondary is powered by induction and radiant energy but the switching on and of of primary induce the emf, for the best result the would have to have the squares wave possible the joule thief could be improved on that part .If you put 9 volt dc in a coil and switch on and off quickly you will see spikes up to thousands of volts .

[electricme]

@all
I just thought what would happen if I switched the Green LED on instead of the RED LED.

The Frequency Counter showed me a drop from 236.87  MHz for RED LED to 198.00 MHz using the Green LED.
A diference of 38.87 MHz

The oscillope waveforms alter only very slightly, there is almost nothing between them

0184.jpg = closest I can get at .1uS    (micro second)
0184.jpg = at 0.5 uS
0186.jpg = at 1.0 uS
You get the idea now.

0190.jpg shows the Green LED ON the connections of the Frequency meter and the Cro.
0191.jpg shows the frequency of 198.00 MHz on the digital display.

I havent a Orange LED handy to compare but I will look out for one in the next couple of days.
   

[jeanna]

I don't know if I can do this. I will try to upload 2 pics from this xo sugar. I just took them and got lost with the identities . If this is right, you should see different brightnesses and you should also be able to see that the plug tines are connected differently.

jeanna

[electricme]

@ jeanna,
Do you still have that patient search web address, the free one, please? I want to take a look at 381.970 that MK1 suggested. TA

@MK1 do you mean wind the torid like this and then connect a bridge diode to each out put winding, then parallel them up?

jim