Joule Thief

[Mk1]

@Mk1

Thank you for spending so much time to help me figure this out. I have a 1 k resistor and the npn3904 transistor. The wire for the bifilar coil is from a CAT5 ethernet cable. The toroid is from radio shack.

Thanks!

Ok , your wire is multi tread , or single , single work best and is easy to twist around the toroid, that will look better and work also , and there will be more space on the toroid, those toroid may need more turn to be effective , so lets go all the way around first , make it work with the jt light , really make sure your transistor is connected properly , because the connector and emmiteur are reversible
but really work both ways but are not working as good.

When done test again with a pickup coil over the other coils

That should get you started , you need to learn about your toroid , and how many turns needed.

Mark

[altrez]

@Mk1

Ok here is my plan of attack for this evening. I am going to rewind the toroid all the way around. I am then going to test it with my LED strip. If all looks good at that point I will wrap a pickup coil around the toroid and post what happens.

Thank you!

[ScienceMan]

@all

I'm in the middle of winding a coil but I'v got something to ask...

What are the black dots by the coil symbol in some circuit diagrams?

And also, does it matter in which direction I wind the coils?

Thanks

SciMan

[Mk1]

@ScienceMan

It indicates coil direction , you can worry about it later when its time to connect everything to the transistor .

Mark

[nievesoliveras]

@all

I just finished reading about 20 pages now!!!

@all

I'm in the middle of winding a coil but I'v got something to ask...

What are the black dots by the coil symbol in some circuit diagrams?

And also, does it matter in which direction I wind the coils?

Thanks

SciMan

The black dots on a coil representation mean that those ends are winded on the same side. Almost always those dots are situated on the two end wires of the bifilar coil in this case.

Jesus