Joule Thief

[Mk1]

@gadget

For your jt mod germanium the nte 102 seams to be easy enough to get , the question is would it work ?

http://pdf1.alldatasheet.com/datasheet-pdf/view/9365/NTE/NTE102.html

Mark

[gadgetmall]

@gadget

For your jt mod germanium the nte 102 seams to be easy enough to get , the question is would it work ?

http://pdf1.alldatasheet.com/datasheet-pdf/view/9365/NTE/NTE102.html

Mark

well that one has a on voltage of .27 and a gain of hfe 135 . it will work better than a 2n3904 but it looks like i got the last one on earth . No wonder i got the lowest running current Jt . the transistor is  /on voltage specs 0.15  and the Hfe is 275 .. Its is a Shame they Made all the Great stuff way back then . BUT . I have about 80 - 130   coming  I found an old ham buddy who has a bunch of GERMS hep638  Motorola Vintage transistors made for the military .. .  ..they will be supplied  in the LPJT Kits . I see that NO one  on  Net has them or the specs .. its that rare . I have several that i cannot even find a spec sheet at all because they are so rare .  only one at 4 star electronics and you have to get a quote for it . I bet they are 30 40 bucks.with shipping . I think any good germanium signal Amp will work very good with Low power Jule Thieves  as long as they run 20 mhz and a gain better than 125 .. I think that is why i am having sucess in most of My projects . I got Rare Stuff that you cant buy anymore .even My sk3606 is VERY Special . none available anywhere .. and they do somthing nothing else does . Man . I am Sorry Guys . I never realized until i actually tried to find some of those parts .. Rarer than Moon Rocks .. There is a guy on ebay that is selling Vintage 2n2222 gold transistors that exceed any made today .. and a good price too . edit . oops some one snagged them already today .. ifound a price on the hep 638 . made in 1967 . very rare . 80 dollars .. wow . Ok Im selling Mine  for 50 each    ..


Gadget ...

[Goat]

Goat .  that yellow wire with the + is hot and the one beside it is hot . ok then you need to measure the resistance acrosst the middle leg of your pot to the outside led  . get it close to 220

@ Gadget

I measured the middle leg of the pot to the black lead at the output next to the yellow one and I get 1.25 K ohms but that's as low as it would go.  I replaced the pot with a 20 turn one and got it down to 220 ohms but the neon is still low, it gets just a little brighter if I go up in resistance and will shut off if I decrease the resistance somewhere below 220 ohms.

I must be the most unlucky person at this Fuji mod... LOL....

Regards,
Paul

[TheNOP]

Thank for the answer , i got a 3 volt 1/2 watt zener , if i run from 100 v dc , What do you think , would this improve the amps.

depend of what you mean by "improve the amps".

the miliwatts will be about the same across the zener then as provided by your circuit.



anyone have tryed electroluminescent nightlight from ramma ?

they do light with my Kodak 2 AA board, took from a old 110 mm camera.
i can light 10 of them in series, i have not tested how long they can stay on tho.

i also have no problem lighting cfls, no matter the size and type, but the circuit is not tuned and drain batteries fast.
a 9 watts ramma sunbeam with last only 1 hour on that circuit board.
i only removed the capacitor, shorted the first diode going to the cap and shorted the on/off switch.
i hook the cfls to the leads that where used for the flash tube.
without shorting the diode the cfls won't work.


my problem is to find good transistors from the junk parts i have.
the one in cfls are not good for making a one battery jts.
the ones i can get from PC power supply mostly don't work, like the cfls one, or work so poorly...
didn't had much luck finding good ones.

[gadgetmall]

@ Gadget

I measured the middle leg of the pot to the black lead at the output next to the yellow one and I get 1.25 K ohms but that's as low as it would go.  I replaced the pot with a 20 turn one and got it down to 220 ohms but the neon is still low, it gets just a little brighter if I go up in resistance and will shut off if I decrease the resistance somewhere below 220 ohms.

I must be the most unlucky person at this Fuji mod... LOL....

Regards,
Paul

Gosh .I am so sorry Paul . that Sucks .. Mk1 is in Ca and he lit his . This is a Big Bummer for me as well . I really wanted this to work for everyone . Looks like only 30 percent are having success at some of My projects .. I have More coming for you folks and so does Mk and Ist .. Im letting someone else do a few Miracals though for a while . I like others doing Bad things with these Lil circuits . .. I really have no  idea why it dosnt work  for you . I have the same transistor on 3 and they work fine . even the little aaa circuit transformer is three times smaller than the aa fugi and it works good . I will Mod that sucker  when i feel better and get a couple hours 10-18 off it ..

Best Regards
Albert