Joule Thief

[jadaro2600]

I think I have a hoarding problem - so I've been disassembling all of my electronics that I don't need and that won't sell for any reasonable amount of money at a garage sale.  I've found a lot of lenses lately ...   I've also found that toys contain some interesting reusable parts.

- - -

Also, has anyone thought about the fact that the cold cathode type FL tubes are dim-able?

I think I'll use one of the npn-pnp variants on a driver circuit for one and do some testing - hopefully I'll be posting some results tomorrow night.

[xee2]

@ conradelektro

You could make it a lot easier for me (and other would be replicators), by posting your most important findings and conclusions about this circuit. Did you see some drawbacks or problems? How bright was the lamp? And as always my obsession with the frequency, could you measure it?

See previous posts. I think they were at end of March.

[Poit]

Sorry for the newbe question.... I haven't read all 908 pages in this thread   

My question/s
1: Is this just a step up transformer? I mean, like, does it simply just increase the volts at the sacrifice of amps?
2: If my first question is answered 'no', then why not loop the increased output back to the input thus creating a closed loop system?

[Pirate88179]

Sorry for the newbe question.... I haven't read all 908 pages in this thread   

My question/s
1: Is this just a step up transformer? I mean, like, does it simply just increase the volts at the sacrifice of amps?
2: If my first question is answered 'no', then why not loop the increased output back to the input thus creating a closed loop system?

Welcome to the group.  You are going to hate me for saying this but, please read at least most of the previous posts.

The JT is much more than just a transformer otherwise we would have called this the transformer topic.  I don't mean this to sound harsh but, there is so much about this circuit that no one could possibly answer you in a single post or possibly 200 posts.

The JT, by itself, is not an OU device as far as I know, but, it has the potential to be part of an OU circuit.  If it was as simple as linking the JT back into itself, one of us here would have done that long ago.

You have asked a good question and I am sorry I don't have a better, more simple answer.  Feel free to jump in and maybe someone else here can answer you better than my attempt.

Bill

[dasimpson]

the problem with looping the joule thief back into itself is that thay is not enogth current comming out of the device to counter balence whats been put in plus currewnt is what charges the battery not the voltage charging with voltage only dosent charge batterys only false charges them the way i find if a battery is charged or not is to have a 3 amp meter and connect these to ethier end of the battery a no no i know but if the bettery if fully charged i find it shows the ampage of the battery aka 2500mah batterys shows on an 3amp meter will be 2.5amps correct me if i am wrong but this is what i found i tried the voltage trick but all my dead rechargable show 1.30volts thats means they are charged but you try and power anything they wont work