Joule Thief

[jeanna]

Hello All

Special Thanks to Stefan, I'm back on OU again, and thanks to Jim & Bill too! for pointing me in the right direction.

Just thought I'd mention that the 20xLED light bulb that I am powering is a 240v input not a 110v bulb, so I may only be able to light one 20xLED light bulb on mine, Dunno yet though,  I have not tried two of them so far.
Still experimenting.

@ Jeanna, your camping light is great too!

yeay!

In that jtpu as shown in the pic, if it can turn one on then just plug in another lamp with another bulb screwed in the normal way and it should run like from the wall.
I notice a small dimming of the lights when there are 2, but two give more light than one.
The advantage to this one is that there is no modification needed for the lamp or bulb,
I suspect your 20 led bulb must have a higher value resistor added. This will be interesting to see.

You have a small scope don't you?
What freq and volts are you seeing with the jtc you are using? (I am sure you need at least 330v for the 240v bulbs, and I would like to know.)

Also, welcome back!

jeanna

[Mk1]

@all

Hello everyone , i think it would be a great time to make crystal jt , i mean one that use piezo crystal for timing device i think it would be a great alternative to some 555 .

I believe the modification would help battery life , and keeping optimum freq even at lower voltage ...

Anyone know how to do this ?

Any help would be great !

Mark

[slapper]

@Mk1

Take a look at harti's post in the Kapanadze thread:

http://www.overunity.com/index.php?topic=7679.msg238737#msg238737

It uses a crystal.

Take care.

nap

[freepow]

@ Jeanna, I used my scope on my JT-power supply and I have posted a complete drawing of the scope shot, its exactly the same as on the screen, can you help me with what the frequency would be and volts

the very top of the green lines went a bit over the top of the grid when the JT is at its best.

[detrix42]

@ Jeanna, I used my scope on my JT-power supply and I have posted a complete drawing of the scope shot, its exactly the same as on the screen, can you help me with what the frequency would be and volts

the very top of the green lines went a bit over the top of the grid when the JT is at its best.

It looks like .19mS to me, which would calculate (1/.00019) to 5263Hz.  I am not so sure about the volts, because I am not sure about a probe that is at 10x, but its either 125v  or   1.25v.   Being a JTC, I would think its 150v.