Joule Thief

[altrez]

@Mk1

I am not sure what you are talking about? Lets not get into what? Did you go OU with your setup? If so then I am very impressed!!!!!!

Take Care!

[Mk1]

Well, considering this, has anyone tried to attach an actual signal generator to the coil to establish what frequency, if any might be more beneficial than another?

Someone had a diagram of a 555 powering the the whole affair, I was thinking that this may be an easy way to optimize a coil setup, then move to a circuit without the timer having been familiarized with the operating environment under different frequencies.

The core itself is given to chance from person to person, perhaps an optimization method may be in order.

There is tuning with resistance, as has been mentioned before.  Has anyone tuned with a fixed current and a variable frequency, or variable capacitances involved in the blocking oscillation action?

On another note, I though about the voltage slamming effect - I refered to it as such because the voltage is produced when the transistor turns off and has no where to go but through a load..

I built a PNP type jtc, and put all of the coils on the opposite side of the transistor - in such that, any large voltages will already be at ground..I may be mistaken though, I'll have to go back through the diagrams.   

..and here one is.

Good idea!

I have had a feeling that the jt freq needs to be tuned to the resonant freq of the pickup coil.

Can you study that , i personally don't have the tools.

Mark

[jeanna]

@ MK1

In these two drawings the pickup coils are not wound the same way. In MK1_coil_instrux.jpg if both coils are considered to be wound from start to finish in ccw direction, one coil is wound "over, down through center, under" and the other coil is woulnd "under, up through center, over". Whereas Jt_Mk2_2.JPG has both pickup coils wound "over, down through center, under" when considered to be wound from start to finish in ccw direction. Does that matter?

@xee2,
The numbers 1234 and 5678 are catywumpus.  However, if you follow the drawing that has just the 1st half finished you will have made the wires go in the right direction.

When I made mine, since I didn't realize the great number of possibilities of connections, I did not make a good label on each wire end. I suggest that everybody do this. I also suggest after the wires are cut that you make more marks on them to distinguish those cut pieces, and make note where they came from in the winding.

So, because I did not do what I just suggested, I cannot be totally sure, but I believe that you cannot just continue with the same wire. I believe they are crossed with their pair for the best voltage.

It is one of the important things I will test on my next MK2.

So, In South America there is a complex system of tying small knots at the end of strings in some counting systems. I suggest something like this.

1,2,3,4, small dots or marks on the first side or set of coils J and L and
5,6,7,8 on the second or K, M set.

This will distinguish the wires later after you determine the best pairs. And you will be able to connect them to their places in the schematic.

I don't know if a sharpie will dissolve the varnish. I think Nail polish might, so leave enough room for these markings beyond the toroid.

jeanna

[Mk1]

@Mk1

I am not sure what you are talking about? Lets not get into what? Did you go OU with your setup? If so then I am very impressed!!!!!!

Take Care!

Nothing against you mate , there is about 20 pages of that argument , and that was not really helpful . But everyone is needed , are you still having trouble ?

Mark

[innovation_station]

when you transmitt throught resosance there is 0 loss....   hummmmm...   

pic a freq ...      put as many antannas as u desire ... 


just like wireless i net ...   access point     users ....   

all users share the same freq ... 

ist


just my 02 cents ...