Joule Thief

[electricme]

@hazens1,
I like that mini fluro you have there, very nice.
There should be a lot of room in the container to setup a JT within it.
jim

@xee2,

I have just "almost" completed a JT using the diagram you posted back on P571, labled mA fluorescent circuit.jpg
I haven't got as far as including the 1N4007 diode or 220pf ceramic, something 4 tomorrow, it's 1.00Am in the morning here.

I soldered a LED across the (C) and the (E) of the 2N3055 transistor, they both get a bit warm, the LED is very bright, which shows it is working.
I got 50 ohms from paralleling up 2 x 100 ohm resistors, for those not in the know, parallelling resistors, divides the resistance, it also doubled the wattage of the resistor.

Base coil = 3 turns
Collector coil = 7 turns

Secondary =160 up the torids side then 110 turns back down the side. = 270 turns total.

First time I used a 2N3055 on a JT, I'm happy with that.

jim

[resonanceman]

I made 2 LM1s   and one LM1.2

Now  for the fun stuff   

I have been playing  with JTs and back EMF  ( flyback )  for a while.


I hooked   up my LM1.2 in normal JT fashion .  ( 2n3904    5k pot and  a 1uF cap  across the pot .)


I then   hooked  the  output  of the LM1.2 to the secondarys of the  LM1 coils  ( coil only )
I used the secondarys because the  coil  is  larger , I am looking to capture   flyback  pulses .

My 60 LED  array was a little brighter  when hooked  up this way .
(Still way under full power but brighter  than just  the LM1..2 alone )

I then  hooked up the  primarys  of the LM1s to a diode bridge and fed that into a cap . ( each  LM1 primary was making about 5 V)   ( the 2 primarys combined  to  make about 5.6 V .....2 seperate  bridges might  work better )
I then  connected  the cap  to the battery .

The  output  for  the  JT array  was   .08 A
The  output of the battery was .04 A

The  battery voltage  went up  until  it hit  1.295   then  pretty much stopped .
I am guessing this is  about as much  as this type of 1.2 V battery wants to take .

I  used 3 meters  for this . 
I ran it several hours .
I  did not  let it  run overnight.
I tried  letting others setups  run unattended  before .     each time  I  came  back my battery  was dead .
The JT  has a pretty narrow   resonance band ..... I think when the voltage  changes  enough  it slips out of  resonance and  the whole thing goes out of whack . 



gary

[stprue]

Sounds like an idea I have been thinking about!  Please post some pics when you can!

[stprue]

@ electricme

That's a great looking coil, must have taken some time to wind that one!  What is it putting out for voltage?

[xee2]

@ electricme

@xee2,
I have just "almost" completed a JT using the diagram you posted back on P571, labled mA fluorescent circuit.jpg
I haven't got as far as including the 1N4007 diode or 220pf ceramic, something 4 tomorrow, it's 1.00Am in the morning here.

Why didn't you just use the simpler circuit I posted previously on page 559? Didn't it work for you?

The circuit I posted on page 571 was only to test for minimum battery drain and may have to be modified to work with a different coil.