Joule Thief

[kooler]

gadget and tk
what are u guys calling delay lines.. i may have a bunch..
i strip crt's, tv's, and microwaves, all bunch of of things..

robbie

[gadgetmall]

Hey robbie. I  was looking for the part Tk used . I don't remember replacing one,probably because they never go bad.. thank you anyways . i got lot of junk too ,all stored right now but maybe this winter i'll dig in it now that the snakes are froze:)it going to be 26f tonight . And like you ,down south east ,one mans junk is another mans treasure..
What he has sounds like a mini magnacoaster part   here is the delay line i remember . the blue part . the horizontal coil at the bottom right are the ones i remember with a slug in the middle of them to adjust it (we used plastic alignment tools ). they were made of paper with wax with a fat winding on it
Man these things were made to last a life time .And you can stock you parts drawers with them.

[TinselKoala]

@Nick... thanks, that is a really cool way to handle the batteries. I've been struggling with loose batteries and finally made that little board you see, but for larger or more, I am going to use your excellent system, I think. I've got a bunch of springs that will make ideal inner contacts, too. Thanks!
I'm not sure about directly scaling up from low voltage to 12 volts. I've blown several transistors and load LEDs doing that; you probably will have to adjust the resistance in the base leg of the first transistor and also perhaps the collector currents, and of course use the heatsink especially for the TO-220 devices like the TIP transistor.

@Gadgetmall: You're welcome, it always helps me to redraw the schematic, I pretend I'm electrons (or zipons, whatever) zipping around in there and it helps me to understand what's happening in the circuit. Please check the image over and let me know right away if I've made any errors, so that I can fix them.
I've also shown the choke with its magnets, and the delay line that I mentioned: inside there's a mysterious slab of very thin glass with a couple of attach points , indium solder plated I think, from the four pins on the bottom. That is all, no other components in there at all. I have no clue what it is supposed to do or how it operates, and I couldn't figure it out from the website either. I've seen delays like the one in your _ancient_ TV.... that brings back memories for sure. Discrete components! No, the TVs I've taken apart recently have been modern, last-generation CRT types that people just chuck when they upgrade to a modern HDTV with a flatpanel screen. Circuit boards, lots of ICs, lots of good electrolytic caps, the nice rectified output flybacks, etc.
Do you have 4 ea. 2n1749 motorola germanium transistors? If so.... let's make a deal! I might be able to get a better DC balance on the RM503 if I had a new set of preamp transistors for the old thing.

[gadgetmall]

Tk . Yes that is perfect ! that is what i got .. I think most transformers no matter the ratio will work just need some on eto verify i am not going nuts here . i am astounded by the circuit and the little modifications i did . I am on my third replication . had to call it a night working on the  . I have two running  and just check they are on the rise ! .

One thing . to get rid of my capacitor box i placed several 67pf's parallel . 3 of them to get that "balance" better . so i think 220pf worked and also  .0001 

this is the only bulb that lit that i use http://www.ebay.com/itm/1-5W-7-SMD-Warm-White-E27-New-Style-LED-Light-Bulb-Lamp-220V-/160907486635?pt=US_Light_Bulbs&hash=item2576d565ab

and this is the audio transformer i wound like a big Fuji xformer . I  think a fuji transformer might also work here also . I want to try it tomorrow when my eyes rest . I got a germanium board ready for it and a super cap as a battery on it in parallel with another 10000uf . I want to see if it need chemical batteries to cause this thing to keep charging . unreal .
In the pic are the diodes , the red clip and black wire went to the cap box but now it is replaced  and boxed up . I will disturb it tomorrow sometime and check it again . The Led bulb is about 20 to 30 percent lite so it is Ghostly lit. but is lighting 7 smd leds in there and is a night light .


Yea you got some weird parts there . I never seen them before. must be to "modern" for me and probably on a module i think .


Thank you !

[TinselKoala]

My pleasure.

Here's another weirdness I just noticed.... and that cost me another white LED.  If I hook one end of a green LED to my scope ground probe, and the other end to the Earth ground, the green LED glows just barely perceptibly, almost not noticeable but definitely there if you look. Either orientation, same thing, proving AC.
But if I do the same thing with the White LED..... I get a dim flash, then nothing.... and the LED is ruined, but neither open nor short.... it measures 10-25 ohms, same value in both directions. I've accidentally done this to several white LEDs, I now realize, and that's where the 10-25 ohm range comes from. Of course it gives no more light.

I just found my last TIP3055 in the box, it's unused, and I have plenty of unused 2n2222a, and a few 1n60 and 1n34a diodes. Have to look around for the 100 pF cap though... and no good NiCads, but some good NiMH cells. So I'll be busy tonight....