Lasersaber strikes again. A joule thief king ?

[d3x0r]

so?

sorry ; foils are different than I thought... they're both on the secondary...but not on the same end... a while ago the B image would be closer but move the dot on the right side....

[conradelektro]

so?

@alejandroguille

LaserSaber built his coil like shown here http://laserhacker.com/?p=401

Some people say the connections between the copper strips and the windings should be as I suggested (the drawing you posted).

Best is you build a coil like LaserSaber (the same pot core and wire) and then you lead a wire out from each of the two copper strips which you can connect in several ways till it works.

But I think that nobody knows for sure whether the copper strips do anything important and how they should be connected. I also think that the germanium transistor 2N1304 he uses might help to reduce power draw because it has a very low base current and less perfect switching (less collector emitter current if on). I could find some 2N1304 on eBay (not yet delivered), but getting the pot core in Europe is not so easy (that is why I use a different core).

But may be you wait till LaserSaber publishes his latest circuit from his video http://www.youtube.com/watch?v=6B79UJGoNJE

Greetings, Conrad

[NickZ]

  Many of the ferrite e-cores that are used in pc monitors and tv sets use a copper strip on the outside of the ferrite core, so there must be a good reason for this.
  Those that can't find copper foil, might try using a strip of aluminum cut out of a soda can.

[alejandroguille]

@alejandroguille

LaserSaber built his coil like shown here http://laserhacker.com/?p=401

Some people say the connections between the copper strips and the windings should be as I suggested (the drawing you posted).

Best is you build a coil like LaserSaber (the same pot core and wire) and then you lead a wire out from each of the two copper strips which you can connect in several ways till it works.

But I think that nobody knows for sure whether the copper strips do anything important and how they should be connected. I also think that the germanium transistor 2N1304 he uses might help to reduce power draw because it has a very low base current and less perfect switching (less collector emitter current if on). I could find some 2N1304 on eBay (not yet delivered), but getting the pot core in Europe is not so easy (that is why I use a different core).

But may be you wait till LaserSaber publishes his latest circuit from his video http://www.youtube.com/watch?v=6B79UJGoNJE

Greetings, Conrad

ok, thank you very much!.

[conradelektro]

LaserSaber published his latest circuit, see at http://laserhacker.com/?p=406

He seems to use the coil as described here http://laserhacker.com/?p=401

Attached please see a circuit diagram which compares my replication with his creation. My replication is much worse concerning run time with an electrolytic  capacitor. LaserSaber's creation runs for many minutes with a 3000 µF cap, mine only runs about 2 minutes with a 4700 µF cap.

You can see more details here http://www.overunity.com/14591/lasesaber-strikes-again-a-joule-thief-king/msg402222/#msg402222


I am waiting for the delivery of some 2N1304 germanium transistors (bought on eBay), but I will add a copper strip to the outside of the second winding (which is connected to the base of the transistor, after removing the unused third winding). We will see if it changes anything. The copper strip on the outside can easily be added and removed again.

I want to try the coil with a 2N1304 transistor before completely dismantling and rewinding it with two copper strips, one of which should be the first layer. We need the comparison of a coil with and without copper strips.

Before going into pot cores I want to do tests with this more conventional core.

Greetings, Conrad