Joule Thief

[Mk1]

@jeanna

You can replace the jt regular resistor with a diode , i have tried many they all work, the pickups still works. i don't really think the transistor needs to be removed for lowering consumption since a transistor is basically 2 diodes. The reason for removing it would be to get the freq stable at different voltages , that would give us more to work with, helping at lower bat to keep speed therefor increasing run time.

But i did not make any amp draw test , you are so good at it, so you can try a diode to replace the 1 k resistor .

Mark

We all get the instruction but the difference is what we make of it , and the heart will determine that.

[jeanna]

Hi Mark,

First, I think I must have said something poorly.

I think the transistor with its resistor is the best way to keep the amp draw low. I think if you remove the transistor the draw will go up.

I understand a transistor is basically 2 diodes (or maybe 3) so a single diode will do something.

But what I do not understand is why I would use another diode to control the base and therefore the frequency. I don't understand what makes an extra diode at the base better than a resistor or a resistor and cap.

I guess the most basic question I have here is what is it in the diode action that would make it vary with the voltage and allow the same frequency be available to the secondary with varying voltage?

I hope I expressed my question clearly!

thank you,

jeanna

[Mk1]

@jeanna

All i am saying is it works try for your self , replace the resistor with diode you can check the drawing on the circuit , it may be a way to save some energy lost in the resistor , I know it works , how good is it i don't know.

[jadaro2600]

My configurations are far from normal.   The intent is personal, however, so I wind up redrawing over and over again.

The idea isn't to replace the transistor.  I read about these spacistors for higher frequency, but I think it would be pointless given I can't measure anything over 10mhz.

Anyway - I bridged the collector across both windings to the front of the coil with and LED and got it to light as well.  What's interesting about all of these configurations is that they light the LED.  This may be due to the fact that an LED has capacitance.

I think  ist's or mk1's circuits are probably more refined --well, they are more refined than mine.

My meddeling has been for the purposes of understanding electricity and oscillators.

On second thought, the idea of replacing the transistor with a diode array of some sort seems silly now.

[Pirate88179]

Hello all:

I just got back from a long and boring surveillance.  I will continue to update the schematic topic as soon as I can.  I see now that there are about 5 more pages on here and I only updated 10 last night.  I may never be caught up.  Please, everyone, keep up your great work and sharing of this work.  Thank you.

Bill