Joule Thief

[Mk1]

@rensseak

Good morning ,I got to go to bed , but that is the ideas getting a good working unit and use that one to feed other ones,
And at some point the transistor will not be enough to do his work, and the relay makes a lots of sense , i bit noisy but real interesting comment,At that speed will be done by Easter, lol.

[xee2]

@ timmy1729

I added that cap between the positive coming from the battery and the negative going to the battery a shown in the picture to see what it would do. For my big toroid, it did absolutely nothing. The same steady 3.2vdc and 98mA dc.

Cap across battery is not needed. At low currents it does nothing. But at high currents it will help keep current high as battery becomes weaker. It stores energy while circuit is off and then supplies that energy when circuit is on to supplement the battery current.

[timmy1729]

@electricme

Yes they are pnp and npn , i took them a printer board they are made to drive dc motors .They are a2023 and c5611.

@all

It is possible that you already have a ready made bridge diode in old power supply there the ones with 4 legs and a + and - on it.usually black like a big transistor.

Oh, excellent!!! I was wondering what that thing was! I've got one on that power supply I've been taking parts from! Thanks!!! 

[nievesoliveras]

@mk1
You always have good ideas to share.

@electricme
You are a good teacher.

I just have a question now from the information you gave us. How many turns you wind before you make a tap?

Nice work!
I condensed it on one paint file and converted it to jpg for viewing almost all of them in one page.

Jesus

[electricme]

@Timmey
Yep lots of goodies can be found in old PC power supplpies, if you can, try getting a reject TV circuit board, PC motherboard, or old video recorder main board, they have lots also.

Someone mentioned I (ZIM) got zapped, here is how it happened, see photo ha ha.

@ all
take a look at this I found googling around tonight, take your time, mabe we can use some of the material to work out torrid windings?
http://www.ee.latrobe.edu.au/~djc/UltraSonics/Ultrasonics.htm

I got my new coil working, the one with the multi switch, position 4 seems to be at fault, the winding is OK, the sw is US.

OK this torrid I wound puts out 16 volt OC 1.2v under load with a LED IC, powered from the 1st torrid, it is in series.
I thought it would be much better, the output is rather dismal, never mind, I will hook it to a 12v AC supply tomorrow and see what happens then.

@ Mk1
I went looking for those transistors a2023 and c5611, they are made by SANYO,  it appears you have installed a pair of High Voltage Darlington Transisters in your JT, these are not avaliable anymore. They are a 60volt 5Amp current High Speed Switching Device.
Their equilivents are 2SA2023 and 2SC5611 or BD139 and BD140 devices.


I'm going to get 2 NPN BC548s or BC547s or BC546s  and make my own darlington just to see if I can. (I can I can I can)

jim