Joule Thief

[jeanna]

Hi everyone,
Oh my oh my, I will be many days reading all the pages. I was on 285 when last here!

SYS

jeanna

(@GM. pronounced like Gina or jean-na. )

EDIT hours later...

OMG it is like those dreams where you run as hard as you can but you are still in the same place. All day I keep reading and I am still in the 200's!!

love it.

jeanna

[jadaro2600]

Ooh someone else who puts crucial components way up front in the loop instead of their more logical place
I've also tried with the transistor way up front, theat seems to work too. But I must admit that still makes
more sense to me than your moving the resistor to the front... lol
Hey, but you say you're getting good results? Must try that variation then!

Btw, can you tell me how you hooked that diode up? You said you replaced the resistor with a switching diode...
Are you now talking about the "classic JT" setup where the resistor is in front of the transistor control pin,
or is this already the variation where the resistor is up front in the current loop, and then instead of a resistor
you used the diode? Does that mean the transistor is still in the circuit?

I was actually thinking of replacing the transistor itseld with a blinking LED or a switching diode...
...but I haven't decided yet.

...

best regards,
Koen

The circuit failed overnight.  The diode was upfront.  transistor is behind everything...  the LED actually exists between the two across one of the windings and the transistor... i posted a diagram a few pages back - it's a bridged version.

Using my linear transformer and a diode, I make a flashing circuit - flashes really slowly.

What difference would it make whether or not the resistor existed up front in behind, ..would the net effects across the path be the same regardless?

I think I fried my transistor btw - source voltage perhaps being too high, but I don't know. It's a 2N2222 - these are the only ones I've been using.

Now, about the diode - usually there's a voltage drop across diodes.  I have a picture of my using a diode AS a resistor in the circuit, but i had to incorporate a manual resistance switch to activate it - this is problematic though, because it was a red LED, and those are usually low voltage, so...

Have you though about using a Schottky diode then a resistor up front then the current winding.  or some variation thereof?

Also, I've made so many different circuits with this, and have come to the conclusion that I don't know what's going on - I'll just leave it at that, especially after seeing that post about ignition coils.

[Pirate88179]

@ All:

I am still awaiting my shipment that includes neons so I can fire up my Bedini motor with the JT circuit. There are some other components in this shipment that will help me with other experiments.  It has been 2 weeks and still no parts!!!!

I have so many ideas that I want to try but, so little time and money.  If it ever thaws out here I will attempt the JT circuit on my earth battery.

@ IST:

You need to include your flashlight mod in your online store devices.  This will sell I promise you.

Bill

[Pirate88179]

@ Jeanna:

Welcome back!!!!  We all mentioned several times that you would have some heavy reading to do once you returned.  There is some good stuff in these pages so, I think you will like what you see.  Nice to see you back.  Good luck with your reading.

Bill

[jadaro2600]

* notes that it got quite.  must be the overlord telling me to go do my calculus homework.

I bought a small 6" florescent tube and I want to make it light up with a JTC.  As mentioned earlier, the slayer mod may be the way to go.  Are there any other suggestions for circuits ( other than hacking a fuji camera )  ..I would rather custom build my hardware.

Is this pulsed DC or is it AC ( non uniform )?