Joule Thief

[xee2]

@ hazens1

I'm beginning to think a DMM alone is useless for testing the output of these high voltage JT. I get weird reading as well. Like when I add a cap to the output the measured voltage goes up anywhere from 10%-100% depending on the circuit used.

Nice toys. The DMM will only give accurate readings using the AC input if the the voltage being measured is a perfect sine wave. When you use a diode and capacitor, the capacitor will charge up to the peak voltage. The DC reading across the capacitor will always be more than the DMM AC reading since the DMM reads RMS voltage when set for AC input.

[xee2]

@ Artic_Knight

There are a number of videos on utube that show scope shots of JT outputs. I have watched them but I do not have a list of them. You might try looking there under Jule thief and Joule thief.

[jeanna]

... i am not satisfied with the transistor leakage, it may be miniscuel but its still leakage!

I agree with you, and
It is not miniscule.
If I leave my battery hooked to my toroid over night, it drains the battery down and I need to charge the battery.

It is only miniscule if you are using it to power all the lights in your house!

I will be using an EB this summer and getting my lights to work off the earth. (still a transistor, though)
Later I am looking into the mag-amps. So, if you are wanting to make oscillation happen without a transistor, look into the mag-amps.
This is a real thing. The company Butler winding makes these for people.

I will look at a plain jt toroid for you. just the toroid on a battery.
I think you are wanting to see if the wires configuration is making an oscillation.
I will look to see and let you know.

Now, I want to know too. It is similar to what N Stubblefield did, except his was so much more complicated with its internal battery starting system. I will be reexamining his/my NS generators with my scope soon. I want no rain when I am out there!!

jeanna

EDIT:
Nope. Nothing.
I even tried every connection possible and I also put in 2 taps from 2 toroids into each polarity and connected one wire from each and the free wire still showed no oscillation. It was certainly running around the coils back and forth a lot, but not giving an oscillation output. Just a straight run reading.
sorry.

[TheNOP]

I first want to look at the frequency changes xee2 suggested in his explanation of jtc oscillation, where the collector coil can have more turns than the base coil to give higher frequency.

it will probably change the frequency, but not make it higher.
i might be wrong tho, i have no way to verify that.

but what i can say is that it will give you more amps at the pickup coil.


about the magamps.
there are specific ways of working with them, and limitations you will have to work around, that you might not be aware of.
ex: there is always a leakage at off time, that is greater then with a transistor.
    you must energize the control coil before the signal input in most cases.
    signal input must be AC or pulsed DC.

[jeanna]

So frequency depends on the base resistor value and the collector coil inductance.

@xee2,
This is about collector coil inductance

I just made a test I already did before, but I made it again with the scope measuring frequency. I checked a bunch of things.
The base resistor did not change. It remains at 220 ohm.
I am looking at the effect that the base/collector turns have on the system.

I used the widow (black widow = black and red with red magwire  in case you were wondering)
The widow has 5T,8T,40T

I first made the 5T into the collector coil and the 8T wire into the base coil. Then I read off the 40T secondary to get the oscillation frequency and voltage-out through the secondary.
222KHz
52V
220 ohm base resistor

then I reversed them so the 8T became the collector coil, and 5T the base coil.
125KHz
57V
220 ohm base resistor

===
I  added this widow to a second tier and read the secondary of the second tier. I wired it up like that drawing from yesterday.

back to 8T in base
200KHz
36V
reversed the widow's secondary wires input to the second tier cuz there is a difference in light output
181KHz
45V

Now with 5T in the base of the widow on the first tier, and reading the secondary wires of the second tier
200KHz
20V

reverse the wire input to the second tier
105KHz
25V

I hope this makes sense in light of your theory, or will add information necessary to augment it.


jeanna