Joule Thief

[resonanceman]

Jim

Congratulations on your  Bedini.



Great work   

To make the JT run on a 9v battery just change the base resistor to the higher value. (you should get a few thousand volts out of it then)

From  what  I have been seeing  it is not  quite that simple .

I  do  agree that  changing the  base resistor  will  limit  the voltage to the base ......but that is  just the start .

I had hoped  that  I could  just  connect  my   LM coils to  higher voltage and  have higher power out .
It  is not that simple .
The  problem seems to inductance .
Our coils  are  efficient at 1.5V
At higher  voltages  they do  not have enough inductance
I have a 2.5A "leak" through my  C coil 
I added  a pot for   compensating  for the higher voltage .....adjusting that pot  does not  change the leak much . 
Tomorow  I  will  try  to make a  higher inductance  coil

Can  you take some  resistance measurements   off  the coils  in your cattle  prod?
That  would help give me an idea where to start .

thanks

gary

[innovation_station]

well the fun can be had with 2 freqs ...  lol

i got this beat freq and when i touch it it goes nuts and backfeeds to the led pulser ..  wild on the scope

almost like it knew it ...  lol

plus i wound my coil diffrently  5 laps 1 dirrection yes i get 1 dirrection spikes when going for spikes like i said a few pages back im NOT  after spikes lol  i want a ringgggging colapse ...  pulse train ... 

lol now i got 1 ....  lol 

with spikes into the 150 v  and if i wound another wire in the oppsite dirrection   would i get positive spikes lol 

hummmmm   

lol

to bad i cant make a short video ..  1 hell of a crazy bright wave when i touch it then it dances ... all crazy like ... 



ist

here is a pic took 95 trys to get this picture

here is the coil

[jeanna]

@ist,
It will be interesting to see if it does go in the other direction as well.
It seems to be a trick to get this to happen.

Even this dblxx is very directional. The scope shot I posted is unusual. Most of them are densely packed one way spikes. If a fast rate of change is what you are going for, this is a really good way to wind.

EDIT:
Wow cool scope shot. 95 tries. there is some dedication!
I have seen that crazy shape many times.
I see it on the tor-23 a lot.
Now, I know what it looks like on a real scope.
Thank you. That is so cool.
On my scope, if I get closer, so to speak it can look like a camel hump with one tall hump and one short one.

What is the frequency of that wave?


@Gary,
I tried using a 3v battery (well it was 2.54v) on this coil and core today. The volts went from 34v DOWN to 28v!!
But oh my the frequency went from 250KHz UP to 434KHz.

I was very surprised. This was very unexpected..

===

@everybody,

I did set up my full bridge with 2 additional diodes and cap to see just what the voltage is.

Because at the scope resolution where there are 8 volts per division, the scope gave me a readout of 19.2v to 21.02v.
But at the resolution of 20v per division it says 34v.

I reasoned that the scope could detect a skinny spike that was too fast to show me, but it could tell me in the digital read-out section what it could detect.

The cap collected 16 to 18v right away. up to 2 minutes it was still below 20 v.

But I left the cap on for half hour and at that time it had collected 29v.
I am sure in another hour this would be near the 34v peak that the scope says is there.

I am delighted with this primary configuration.

I will fully wind a secondary and test it.

This ought to have room for 85 to 95 turns through the center... IF the cross wires do not take out too much space.

I have 2 others of this core size with 74 turns and I may make one with that so I have a really good comparison.

There are 4 pie shaped spaces in between the crosswires.
For this preliminary test today, I have kept the 14T secondary all within just one of the quarters.
I will be looking through the scope to see what happens to the wave when I move out of one quarter into another.

thank you,

jeanna

[innovation_station]

thanks jeanna ... 

the pic was the wayyyyy easy part ...  just try to tune into the wave agin ...  i was useing a 50 k pot

the wave is easy if you touch but i was not touching anything i had it running like that 15-20 min

till i bumped it

but i got some vids but im not tubbing ....   

ist!

there 2 waves infact 3 but ....  ill say 2   first freq is fast to make my ringgg spike second intrupts the first ..  at a realy slow speed im powering the jt from a led from my dollar store chaser ...  i may make 2 more ...  then tune them all 3 right in to a 2 freq pulse train that rotates

this could be a controller for my last tpu ...   1 way i can do it ...



lol


BAMMMMMM  i got it .....    lol   duh!!!  i feel dumb...  lol   

put a neo on the toroide ...  lol    lol   

now it is stable and easy to tune it 

wow now maybe it is just me but it seems to be accelerating ...  wild ...   

the pulse seems to get going quite a bit faster ... than when it first started i never did a thing ... 

the pulseing on my supply has not changed its speed

but my scope seems to be flashing faster

correction IT IS ACCELERATING ....  NUTS.....

i just blowen away it is going crazy ....  since when i started it ...  it has picked up the pace at least dubble time ... 

what can this mean ?

[stprue]

thanks jeanna ... 

the pic was the wayyyyy easy part ...  just try to tune into the wave agin ...  i was useing a 50 k pot

the wave is easy if you touch but i was not touching anything i had it running like that 15-20 min

till i bumped it

but i got some vids but im not tubbing ....   

ist!

there 2 waves infact 3 but ....  ill say 2   first freq is fast to make my ringgg spike second intrupts the first ..  at a realy slow speed im powering the jt from a led from my dollar store chaser ...  i may make 2 more ...  then tune them all 3 right in to a 2 freq pulse train that rotates

this could be a controller for my last tpu ...   1 way i can do it ...



lol


BAMMMMMM  i got it .....    lol   duh!!!  i feel dumb...  lol   

put a neo on the toroide ...  lol    lol   

now it is stable and easy to tune it 

wow now maybe it is just me but it seems to be accelerating ...  wild ...   

the pulse seems to get going quite a bit faster ... than when it first started i never did a thing ... 

the pulseing on my supply has not changed its speed

but my scope seems to be flashing faster

correction IT IS ACCELERATING ....  NUTS.....

i just blowen away it is going crazy ....  since when i started it ...  it has picked up the pace at least dubble time ... 

what can this mean ?

I'm lost are you talking about the prod you found or a JT coil you made x2 style?  I found the ansewer to this in the New TPU Build topic...Thanks!