Second Stage Joule Thief Circuits

[Groundloop]

@All,

I have done a HW modification to the feed back circuit. I have added a 32KHz crystal to RB6 and RB7 pins
together with two 33pF ceramic to ground. Then I have configured the new attached software so that
the circuit uses ONLY 0,6mA as an average from the input battery. See attached drawings. One good
source for a 32KHz clock crystal is from old PC motherboards. See photo of the xtal so that you know
what to look for. I must stress that this new version 1.7 software will ONLY run if there are a 32KHz
crystal soldered to RA6 and RA 7 pins on the PIC16F88. The crystal and capacitors can be soldered on
the underside of the pcb.

Alex.

[jeanna]

hello
no high voltage section in this forum.. man what gives..??
this isn't a joule theif .. but it was once the second stage to my jt..

the first video is a bulb lite.. nothing kool.. but it is bright enough


robbie

Robbie,
It is in the solid state section where a hi voltage thing that starts with more than a single AA battery goes.
The original place for the jt thread was there until it got so big itself that it got a section.
Please start a HV jt thread or something like that and give the specs.

or just give them here.
I saw the dc to dc converter there, so maybe that is at the heart of it?

I wonder what one of my jt with 1000v secondaries would look like with 6 volts to start it?

Do you have one like mine that you could try with 6 volts. I do not have the dc to dc converter .
And, even so, I would like to see the circuit. The light is steady on, and that is my ticket for starters.

thanks,

jeanna

[kooler]

jeanna
you can make any toroid run higher volts.. more collector windings

but didn't you have a tor60 that put alot out... it just all about charging the cap as fast as you can..
but i think i noticed that it isn't the size of the cap but the frequency it discharges..
the large caps are slower to respond..

robbie

[jeanna]

Thanks kooler,
I was just trying to squeeze the information from allaboutcircuits today.
I really want to know the simplest thing. It is so simple that nobody thinks I am asking it because it is such a well understood thing.

OK
I know about the time constants.
I know I need to find the right speed charge and throw a switch or like that to empty the cap then it will drop out from the cap and then reset the switch and it will refill.

I also understand that an inductor will act like both the resistor and the switch allowing the cap to fill then discharge.


I am asking how you put these things together.
I do not know how to draw the circuit so that what dumps out from the cap goes where I want it which is the lamp.
I understand the volts and freq of the cap and inductor is the fiddly part. but where is the lamp?
Is the lamp in the same spot and so parallel with the legs of both inductor and cap? Is the lamp in series to those after they do their work?- that is how I had it in my ac from jt circuit.

Since it is fiddly, it is really hard to know if I have put the pieces together wrong when nothing happens, because it could just be that I need to fiddle more.
But, if the pieces need to go together differently, then no amount of fiddling will help me.
OR
Is this such a complex problem that nobody else knows the answer either.
I am starting to suspect the latter.
Today, you got a steady light (no visible pulses) from a bulb.
You called it nothing special.
ummmmm
Can you help me do that or is this something that dc to dc converter did for you, and it was just drawing lots of amps from your battery?

thank you,

jeanna

[xee2]

@ kooler

hello
no high voltage section in this forum.. man what gives..??
this isn't a joule theif .. but it was once the second stage to my jt..

the first video is a bulb lite.. nothing kool.. but it is bright enough

http://www.youtube.com/watch?v=HoLDlTv5YGw

and the second video is just high voltage fun..
but be warned that it is high voltage and could kill.. trust me!!!!!!

http://www.youtube.com/watch?v=n04977vS6b4

stay safe and have fun

robbie

I missed this since I do not check this thread often. But now I found it. Great stuff. Are you feeding the flyback with 1000 volts? It sure makes some nice sparks. Thanks for the videos.