Joule Thief

[xee2]

@ jeanna

Circuit needs cell phone charger to up the 1.5 volt AA to 5.5 volts. But, it does not need a toroid to work. So it solves the problem of not being able to get a toroid.

[jeanna]

@ Jeanna, your 2x lamps in your trailer, are they US 110vac 20xled lamps ??

would it work with a 2n3055 ?

really great light !!!

Excellent job !!!!
what does your circuit look like ??

Thanks freepow,
Yes, it is 2 light bulbs in 2 lamps which are both made for 110v plug into the utility company power.
It would certainly work on a 2N3055. This has a TIP31c which works almost the same.

And one lamp is brighter when it is alone, but both together are brighter than the one lamp alone.
Did that make sense?

The circuit is the jtc with no led across the C-E junction, but with a secondary.
This has about 85 or 100 turns on the secondary and the lights are connected between the secondary wires.
The scope shows 150v at 14kh. It works well with 2AA batteries too. With 2 duracell alkaline D's the scope reads 192v spikes.
I use the D's when camping because I do not need to change them very often.

Thank you,

jeanna

[woopy]

@ Xee2 ,Kooler, Slayer , Madame Jeanna , Pirate  Ist  and all

Thanks for this very interesting thread

And here my contribution 

after following the very good shematics from all of you, i decided to follow the last shematic from today's Xee2 post

So i made a 60 turns of 0.5 mm copper on a plastic tubing of 10 cm diameter as secondary winding .

The primary is 5 turns of 0.5 mm copper slightly bigger than the first winding so ( as Slayer said i can move the position up and down)

I made a first try with the  2n 2222 A transistor and 500 k ohm and it was very good i got an AC voltage up to 80 volts  (p to p 160 volts)

Than i tried a 2N 3904 and the Ac voltage went to 170 volts or P to p 340 volts

Datas


Coil 10 cm diameter  (no toroid)  = air core coil

primary          5 turns     0.5 mm copper    0.3 Ohm DC resistance   Mh indicated on L meter -0.005   unmeasurable !

secondary      60 turns    0,5 mm copper    1.6 ohm  DC resistance   1.6 Mh

Transistor     2n 3904

resistor as per Xee2 last shematic   470 K ohm

Basic input current  ( average ) 43 ma from a measured 7 volts Nimh battery



And i could lit a Neon bulb easily     but what surprised me totally  i could lit this neon bulb  with only one connection to the coil and the other is a simple antenna about 20 cm long of 0.5 copper wire connected to nothing

and both neon electrodes are lit and bright   !

Very intersting and go on the good work

Laurent

[innovation_station]

nice of you to join us here ... 


did you try an earth ground insted of the antenna ? 

any diffrence .?

ist!

here are a few pics of my latest build ..   

no problem at all to recharge that battery ...  so i will use a small solar to top up the aa ...

: )

[altrez]

@ Xee2 ,Kooler, Slayer , Madame Jeanna , Pirate  Ist  and all

Thanks for this very interesting thread

And here my contribution 

after following the very good shematics from all of you, i decided to follow the last shematic from today's Xee2 post

So i made a 60 turns of 0.5 mm copper on a plastic tubing of 10 cm diameter as secondary winding .

The primary is 5 turns of 0.5 mm copper slightly bigger than the first winding so ( as Slayer said i can move the position up and down)

I made a first try with the  2n 2222 A transistor and 500 k ohm and it was very good i got an AC voltage up to 80 volts  (p to p 160 volts)

Than i tried a 2N 3904 and the Ac voltage went to 170 volts or P to p 340 volts

Datas


Coil 10 cm diameter  (no toroid)  = air core coil

primary          5 turns     0.5 mm copper    0.3 Ohm DC resistance   Mh indicated on L meter -0.005   unmeasurable !

secondary      60 turns    0,5 mm copper    1.6 ohm  DC resistance   1.6 Mh

Transistor     2n 3904

resistor as per Xee2 last shematic   470 K ohm

Basic input current  ( average ) 43 ma from a measured 7 volts Nimh battery



And i could lit a Neon bulb easily     but what surprised me totally  i could lit this neon bulb  with only one connection to the coil and the other is a simple antenna about 20 cm long of 0.5 copper wire connected to nothing

and both neon electrodes are lit and bright   !

Very intersting and go on the good work

Laurent

Nice work!!!!

Take care,

-Altrez