Joule Thief

[resonanceman]

@ resonanceman

Thanks.

I measured spikes over 200 volts between collector and emitter on my circuit (lights 2 neons in series but not 3 in series). This is well above the spec for the 2N3055. But, I guess it is OK to use a 2N3055 since you have not had any problems. That is good news since they are easier to get than the MJE13007.

Xee

I have not   had any problems  with this  basic  setup ......but when I  added  the ignition coil   for flyback    I burnt  up  a 3055  and a 60 LED array  and  damaged  a DMM.

I think it  is  pretty safe .
Are you sure you are measuring  across the   collector and emitter ?  Are your neons  in the   original  JT LED position ?
That  sounds  like   secondary  voltage to me .
The primary  runs at much lower  voltages

gary 
gary 

[xee2]

@ resonanceman

Are you sure you are measuring  across the   collector and emitter ?  Are your neons  in the   original  JT LED position ?
That  sounds  like   secondary  voltage to me .

It is not the pickup coil voltage, that goes over 1000 volts.  It is between collector and emitter in the normal JT diode location. I usually do a quick check just to see how close I am to the spec. The 2N3055 seems to be very hardy.

[nievesoliveras]

Jesus

My  flyback  transformer JT is  a little  bit simpler than yours .
I use pins  1  3 and 10
They  are  hooked up  exactly like  a  regular jt .
The  3 pin is  hooked up  as if it was the  start and   end that  are  twisted together  on  a regular  JT.

gary

I think that I made a mistake thinking that changing the @xee2's connections will change the performance.
I now see that it does not matter because there are 2 wires tied together always.

@ nievesoliveras

     There is no need to reverse pins 2 and 9, they are tied together. The circuit you posted is not better. Build it and you will find out.

You are completely right! I just noticed it after posting. I could not get back to the posting on time to put it out. I have been having troubles connecting to the internet for almost 2 days now.

Jesus

[xee2]

To anyone thinking of using a flyback transformer:

I know this has already been said, but it is worth saying again. These things are extremely dangerous. Yucca was putting in 10 watts of power (20v @ 500ma) and in my experience the JT is about 10-20% efficient. Thus, even at 10% efficiency he had over 1 watt of power coming out at more than 10,000 volts. This is VERY DANGEROUS.

[innovation_station]

To anyone thinking of using a flyback transformer:

I know this has already been said, but it is worth saying again. These things are extremely dangerous. Yucca was putting in 10 watts of power (20v @ 500ma) and in my experience the JT is about 10-20% efficient. Thus, even at 10% efficiency he had over 1 watt of power coming out at more than 10,000 volts. This is VERY DANGEROUS.

i fully agree .....

BE WIZE....  this is the reason it is scartered on ou ...    it can be fatial ....

so please ...  go slow and stay safe ... 

i guess you all know why i never built some of my crazy designs ... SAFTY FIRST ... learn  test prove then build ... it would have been nice to be funded but ... 

now its too late ...    cuz ill do it all by myself ... if i must!!!

so im building things JUST A LITTLE BIT DIFFRENT ...    SAME OLD TRICKS ...

but i will do it mechanically to avoid stupid problems .. plus this silly world can understand them much easyer as you can see it spinn.....   shusssssh   dont tell anyone you just remove the rotary parts ... lol

i will atempt to tap MANY HORSE POWER FROM SOME OF MY BIGGER DESIGNS ..

i will try to get 200lbs of material spinning at 1500 + rpm ... from a pulse motor 

im not sure the equasion any more ... but who cares ...   i think with the tesla turbine ..  @2000 rpm 10lbs would be putting out 200hp

do not quote this it has been years since i checked into this ...  sheesh the stuff that has flowen through my mind since then is unreal!!

there is no reason it will not power an entire house.. plus when it breaks down cuz things always do ... it will be easly repaired ...

no guessing wich chip blew up ... 

ist!