Joule Thief

[truesearch]

@gadgetmall:


That sounds great!! Congradulations! 


Looks like your input is 1.2vdc but can you get an exact milliamp on that input voltage? And what output volts/amps?


truesearch

[crowclaw]

having big problems posting circuit!!!

[crowclaw]

Sorry all... Managed to post the circuit quoted earlier

[lasersaber]

when i saw the 110 volt 60 watt filament glow on a rechargeable aa i am happy .
i let it run for 15 mins and there was hardly no drop in volts still 1.2

I knew you would get it working!  I updated my website today so you may want to check that out.  I will be posting a new video soon.  I am building with much larger rods now and the performance is great!  I am also experimenting with adding a spark gap and also feeding excess power back into the source.  Loads of fun.  When built right these power unmodified CFLs with no problem and unless the load is huge the transistor stays cool.

[crowclaw]

I got it !!  I took the other new rod and wound 1080 turns of number 26 then taped it . Then i wrapped 370 turns #20 on top of it and taped it . I can now light an incandescent filament with 1.2 volts and transistor runs cold ., BUT running over 12 volts blows the transistor . due to high voltage . I blew three 2n3055 and one tip3055 , SO now is where i need to put some resistance in this circuit and probably a neon to protect the transistor . It's KILLER !! about 10.5 it lights an unmodified 120 vac cfl  unmodified leds lamps 60 watt light bulbs and in my opinion i should be able to loop it with a cap  .. no time for pics right now maybe tonight when i figure out how to tame this powerful ls circuit ..

Crowclaw it is lasersabers circuit . I am just modified it to run on one battery . see a few post back for his diagram . he has no base resistor just an 8 inch special ferrite fat rod and one layer then another layer for the primary . It is an awesome circuit one you get the wire length right . right now i think i have too much but i like it that way . when i saw the 110 volt 60 watt filament glow on a rechargeable aa i am happy . i let it run for 15 mins and there was hardly no drop in volts still 1.2  This is unconventional . puts watts out for milliamps . Oh i also have a strong magnet attached on one end . it make it brighter .

Gadget

Well done Gadget, Youv'e rewound your coils and altered the circuit reactance. The base drive impedance has now increased thus lowering the collector current to a lower level, hence transistor runs cool. This is were you need to introduce a base resistor to adjust the bias for higher source voltages. Trimpot would be useful to find the sweet spot. Also back emf  together with a far higher output pulses seen off your 2N... It's all down to finding the best working efficiency of your particular circuit configuration. Good work