Joule Thief

[jeanna]

The Rectifier bridge has two ac as input as you said and two outputs. one is negative dc and the other is positive dc.

Jesus

Hi Jesus,
I think the part that has me most confused is the ac part.

MK1 shows a load coming off the ac end of the bridge.  He indicated that is the meter. When I use the meter in this spot as drawn, I get a lower voltage than when the 4 wires are not connected to the bridge. ??

But first let me describe what I have:

Each wire pair shows about 75 to 79 volts.

Then, before I made the bridge connection, I put all 4 wires in series. Like that, I see around 108 volt. So, I believe there is some reduction from I guess phase canceling.

OK so, after I checked that, I disconnected the series connection of the 4 wires and I was back down to 2 pairs of wires each one showing 75 or 79 volts again.

I put one pair on the dc ends of the bridge and the other pair on the ac ends of the bridge.

On the + end of the bridge I get 37volts
On the - end of the bridge I get 51volts
On one of the ac ends I get 3volts
on the other of the ac ends I get 47volts.

These are readings I did over and over. Many times a wire was loose or detached and I did the reading again. I never got close to 100volts through this bridge and certainly never got the sum of the 2 separate wires which would have been 150volts.
MK1 says he gets both ac and dc from this bridge. I am interested in keeping the ac.

Have you made a MK2?
What are your results so far?

thank you,

jeanna

edit add- good drawing esp for a first one, jim.!

[Pirate88179]

@ Jim:

Nice job on the circuit!!  I'm off to check to see if I won the Tektronix O'scope auction.....it closes in like 20 minutes.

Bill

[amigo]

a normal light bulb is not much different then a led, only the way to make the light is.

If you really wanted to say something like this perhaps this would've been better:

"A normal light bulb is not much different than a LED as they both produce illumination."

and stop there...because the two are polar opposites in every other way.

The whole reason JT works is because of the intrinsic characteristic of the LED.

Somewhere buried in this thread I posted a link to an eBook about LEDs but many have ignored it, so for your benefit I'll post it again: http://www.mediafire.com/?z2i4niwyf2y

[Mk1]

@amigo

You are right but tesla did light incandescent light bulb, from hv pulse.

[Mk1]

@jeanna

Try connecting one pair to both ac legs and the DC+ into the other pair try both ways , check voltage between bridge neg and coil output.