Joule Thief

[rensseak]

OK renseak,

I just made 30 turns around this all copper ring. I made it as described in the video and after finishing 5 times around using 24gauge tele wire continued to make 30 turns around that core. Then I twisted it beginning of one to end of the other wire and set it up like a jt.

The light is fair. It is bright. but not as bright as the 2 lights working off a secondary that I took the battery from.

And the amp draw is 29.5mA
The light should be much brighter for that draw.

I cannot get another light to light in parallel to this one either. It puts out the first one and takes a minute or so to light that first one again.

I am wondering if I have hurt the breadboard or something. I cannot get the result you have. Darn.

jeanna

like what i said my wire is from a LAN cable. each wire there is still multi stranded.

the light is not as bright as you can reach it with a ferrite core.

Norbert

[jadaro2600]

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

Well, I mused about the voltage issue a while back.

My solution is / was to put a few like-propertied capacitors in series to divide the voltage down for reading across one of them. If they're all of the same type, then the division should be evenly spread across the components.

This doesn't solve the diode problem, the fact that these diodes can handle higher forward voltages then reverse voltages makes them a shaky deal. ...also, the properties change as they heat up - of course, most of you / us know this already.


@rensseak,

These work fine as a twisted pair, it has to be a tight twist though - not so sure about larger wire.  This type of setup is only good for minimal voltage gains.  Having a comparison of data is useful for building an object model.  It looks like you may have gotten a reading that's rather remarkable.

@any / all
Measuring the current must be done by inserting the ammeter into the circuit.  ..just put it inline upfront.   I don't want to insult though - I had to be told this - I was getting odd readings.  Sometimes inserting the ammeter can cause the circuit to behave differently.

[MrMag]

Can someone explain what the notation 50WVDC max means?

50 working volts DC. normal operating voltage

[innovation_station]

welcome back MR MAGS..

hope all is well with you ..

2 sample cores are due to arrive today   

yes they are BIG ONES ...

5.5"    ill take a pic ....  i hear they got the addy wrong ... lol 

i just cant waite to whip em up 

AND  A BIG WARM WELCOME TO EVERYONE NEW .... yes im a little slow on all the DUE WELCOMES...  but it is a big job learning ... and it has been a crazy ride... 

im getting there tho ... 

jim ...    bring it on   .. 

cant waite to see    the good old cart 

ist!

[innovation_station]

@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

i also know this feeling 

things may go well beond our current comprehention ... 

ist!

a device of such importance ....  and so simple in operation DESERVES THE MOST DETAILED EXPLANANTIONS....