Joule Thief

[TheNOP]

I pulled one wire out of a led leaving only one secondary wire on the + leg and the led stayed lit. (I don't need to say that shouldn't happen.)

jeanna...
it is not magic, it is call capacitive coupling.

it is the same as putting a capacitor between the free leg(s) of the led(s) and almost anywhere on the jt circuit.
the higher the frequency of your circuit the better the coupling is.

[jadaro2600]

Since I've been in a rut lately, I decided to take some readings on my Helmholtz style inductors.

I get more voltage difference by rectifying the fly back toward the positive than toward the negative.

I also noticed that I can get a frequency reading between my finger and the collector.

And that the metal plate sticking out of some of these transistors doubles as the collector.

The frequency measurement values go down when there's a load in the circuit.

[xee2]

@ MK1

News about the mk1 High voltage , dual 80 inch pickup coil , 850 v rectified dc its about 70 turns , 2n2222 with 1k base resistor diode bridge made of 1n4007. Any idea what i will be doing with this one ? And this is from a one inch toroid .

Congratulations. But how did you get 70 (or is it 140) turns on a 1 inch toroid? You must have magic fingers.

[xee2]

@ jadaro2600

I get more voltage difference by rectifying the fly back toward the positive than toward the negative

About how many volts difference do you get?

[TheNOP]

I wanted to see if one battery powering the jtc in stepwise fashion would give more useful power or not.

unfortunatly, it will not.

transformer are the worst, the most energy waisting, componants in electronic, even when made carefully.
well..., not exactly true, they come second, just after low value load resistors.

the jt circuit secret is that it step up the voltage without a transformer.
but sometime, most of the time, we can't avoid using transformers.
what electronic componant can support very fast repetive high currents spikes...