Second Stage Joule Thief Circuits

[gadgetmall]

Here is a good and simple design

I think 250 @26guage Primary

15 by 3 BC coils

These are approximate!  Good Voltage and easy design.

Stpru. I need measurements . Volts are good but the current is more important  .So when you  post and did experiment with a 1 ohm resistor in place across your output and take a current measurement and volts with the windings #,toroid type and transistor and input current  .this will indicate weather you have higher than the standard Jt using 2n2222a of mine  14 volts @5.5 ma is mine . we need higher !and remember the source should be an aa battery with the circuit drawing no more than 20ma . I guess this could be a bit higher if you use a D cell rechargeable . Thanks  a bunch!

@ist . these aint normal caps bro . you will see .I can charge anycap up with any jt secondary but not these . try and put a 1 ohn resistor across your output and read the milliamps across that . thanks  bro . If you can come up with half the shipping man i will give you a loan for the rest and you can pay me back later . You need your stuff !!
gadget 


Ps ./i am checking on all the parts and will try to put together the units as kits ,everything except the 650-f cap . I have  quite a few 1500farad left so this would be an option and once we nail this its possible lower ultracaps would work , maybe .   Time to fix supper . see you all later ..

[guruji]

Al:

I would consider Jeanna's coil for this maybe? (The same as the Jeanna's Light circuit)  At almost 1,500 volts the charge cycle would not take long at all on the b-cap.

Now this is what I have learned with mine so far.  At first, you think you can't feed 1,500 volts into the little 2.7 b-cap and in reality, maybe that is a bit too high, but you can send in a very large voltage signal from a JT that the b-caps "converts" for lack of a better term, into power/voltage via capacitance formulas.

So even though the 1,500 volts input has very little amperage, when that b-cap gets to 2.7 volts and cuts off the input signal, you will have a full cap.  I think this would happen very quickly too.

Anyway, my two cents.  There are other very good JT's out there with much lower outputs and they may be better for this application, I don't know for sure.  But, Godspeed on this project Al, I feel confident that something very good will come of this.

Bill

Hi pirate you mentioned 1500v on Jeanna light where is this schematic? Can you please lead me to it?
About that Ucap Gadgetmall did you find a way to charge it fast?
Thanks

[jeanna]

Hi pirate you mentioned 1500v on Jeanna light where is this schematic? Can you please lead me to it?

Thanks

Hi guruji,
It is the plainest joule thief with a secondary circuit you can find.
I will post a drawing with interchangeable outputs.

The important parts are the
TIP3055 or TIP31C make the leap to much higher voltages with this big toroid.
So you have the toroid?
I am waiting for my trial samples so I can hopefully offer and get a range... more later.

Here is the general schematic.
After testing the jt circuit with the basic light in place, remove the led and use only the secondary.
You will need over 450 volts to light a fluoro tube. My 1400v was from a combination of tuning and parts.

I know you have made some of these, but I forget... where are you in the process?
Have you made a jtc with secondary that lights 6 to 12 leds in series?
That is always a good step anyway. It will never hurt to have a 6 to 12 led circuit around andit is good practice with the elements.

jeanna

[resonanceman]

I  have been thinking about  the control unit for  the  cap  charger

I  wonder  if  a  circuit  that will work at  low voltages is really needed.

We need something to  make sure the caps  don't overload .......and something to automate switching  the caps

It seems to me  that   when  the  cap we are charging  is low .......there is no need to do anything except  charge it up .   any  power  used in a controll circuit is wasted .

Once  the   cap we are charging  is  nearly full .....we  have around 2.5 V      is it hard to find  componets that will work  on 2.5V ?

It  seems to me that  we need something that works  like  the safty valve on a water heater .
The  safety valve on awater heater is   just  a  valve held closed by a spring .
If  the water presure get to high ....the sping can no longer hold the presure so the valve opens .

In our case  I think  we only need to  connect  the  gate and  source of  a mosfet 
If as  the  voltage  gets high enough the  MOSFET will start  conducting .
I see no reason that the power that " leaks"  out through  the mosfet can't  be used to power   some kind of switcing system 

One way that  this power could  be used is to  use  it to charge  a small supercap attached to  the  gate  of another mosfet 
It  wouldn't  tale  a very large super cap to   maintain  voltage on the gate of a mosfet long enough to charge  the Ultracap


Then there is the possibility  of putting 2 Ultracaps in series  and having 5 V to work  with


gary

[Groundloop]

@resonanceman,

Yes I agree.

If you look at page 39 in this thread then you will see that is what I have designed.

Groundloop.