Joule Thief

[jeanna]

in the jt transfo case, the spikes come from the pressure.

Thanks NOP
I will show you an example of one of my favorite sites. Barry's coil gun java applet. In this example the volts are 100v and on the graph the amps are shown as the wave height.
In ac the electron charge goes first one way then another way. This is why I made the connection to the back emf caused by the collapse that produces the spike.

I guess I don't think of the jt as a pure transformer. I think of it as an inverter/transformer. And when does the amps get separated from the volts when the thing is operating as both simultaneously. ?

Oh, I am talking about the stuff that produces work off the secondary which does not take a greater draw from the battery than the draw of the transistor alone.

While I think it is possible to rig this jt up to be an ordinary electronics circuit, there are also many configurations which do not fit into that regular square box, if you know what I mean. lighting 30 leds from one single turn of the secondary using 1.2v is one example.

I am trying to see if it is possible to expand the E=IR etc formula to see how this observation we are making can exist. Just musings, really.

thank you for your explanation,
here is barrys waveshot:

jeanna

[jadaro2600]

Can someone explain what the notation 50WVDC max means?

[jeanna]

@MK1
As far as my goals are concerned...
I want to push this to see how far it can go.

My life MO is always to know how things work. (ergo my little attempt at explanation, which is not necessary for many folks, but is very necessary for me.) 

Lots to go on tonight.
thanks,

jeanna

[electricme]

@all
I'm back home again at long last, nice to be home.
Wife lookin better, they moved her to the maturnity because of extream lack of beds in the usual ward, boy have I got a story of mismanagement here to tell, another time, it will keep.



DIODEs, I did a little snooping around about diode specifications, the penny dropped the other day, some people here carn't figure out why thei projects stoped working, it's the specifications the divices are rated at.

1N4004 can handle up to 600 volts, at this voltage, current it can handle is reduced, so if your JT puts out say 1kv or higher, then kiss your diode goodbye.

Yep might be time to use signal diodes or switching diodes, but Hv types.


How come I misse this small item? because my DMM wont display a voltage that high, I just thought my JT wasn't working, when it was over 1KV out, trap to be aware of.lol


I'm about 12 pages back, soo Im here but studying along also.

@Bill,
I found a "Forum Downloader" a free one via google, got to set it up and see how it performs.

@Gadgetmll,
I visited your web site, and saw the CT movies link, very good.

Theres a new utube downloader out, seems to work nice, I will give the details shortly.
****** EDIT       http://www.flvsoft.com/download_flv/


Now I had betta unpack the charriot

jim

[rensseak]

You have a toroid made of a twisted pair.  If it weren't a toroid...  if it were just a twisted pair.

@jadaro2600

oh, i didnt try it, but i think there will nothing happen.


@jeanna

> By primary jt lights, I mean is it a stack of leds in parallel to each other hooked up between the C and E of the transistor? <

yes they are in parallel and between C and E. for the amp draw i was reading 0.34 mA direkt after rectifying no load. My transitor is a BD139 an no resistor. this morning the light is off.

there is only two twisted wire with that is build the core and the turns around the like what you have done just with more turns.


Norbert