Joule Thief

[Flux4Energizer]

Hi  everyone,  need some help !!!

See attached picture first then read on...

Each Joulethief  drawing say about  150 mA each,  and I want to put one (Green LED) in the circuit to light up only when I switch one or more Joulethiefs on, in the circuit.

I cant put a green straight on the positive line because when I switch more than 1x Joulethief on, the current draw will be 150 mA for each Joulethief,  for example... If I switch on 4x Joulethiefs it will be drawing 4x 150mA = 600 mA's going through the green LED.

So does anyone have a clue where I can add the Green LED
I want to use the green LED to come on with a load, but I dont want a green LED on each seperate Joulethief !

Why don't you take the green led, a npn transistor and a resistor.
Put the resistor on the base of the transistor and the other side of the resistor you connect to the on/off switches (on the switched side of course).
Now put the led on the positive rail and the negative on the collector of the transistor. Now connect the emitter to the negative rail.
If you connect every switch in parallel to the resistor which is connected to the base of the transistor the green led turns on if one JT (or an other circuit in that case) is activated and stays on if there are two or more. It doesn't matter which JT is turned on every time the green led will turn on and stays on till all JT's are turned off.

Sorry i can't draw you a scematic because i'm posting from my phone right now but i hope this helps.

Regards,

Flux4Energizer

[Flux4Energizer]

@Freepow,

I just remember that i recently made a video where i use the same method to trigger a ssr.
In the video i also taped the circuit diagram, i even zoomed in on the part you're asking for because i made a little mistake there but that is explained also (i put the npn transistor between the positive and the circuit instead of the circuit and the negative).

Hope this helps, here's the link:

http://www.youtube.com/watch?v=ozLt_JXDz7g

Regards,

Flux4Energizer

[xee2]

this new core i got i can get it down to 5 ua.. without blinking a white led and is brighter than the ferrite core but any circuit below 5ua it just cuts off ..
you got any idea why.. is it cause the wires are a few mm away from the core..

1.5 uA Joule thief using nanocrystalline core >>> http://www.youtube.com/watch?v=ZfMj4B7c0Ww

[Pirate88179]

1.5 uA Joule thief using nanocrystalline core >>> http://www.youtube.com/watch?v=ZfMj4B7c0Ww

Xee2:

Nice job!  I just looked up those nanocrystalline toroids and they have very interesting specs.  I had no idea that we could find material with a permeability that high.  I thought we were doing well with 10,000, ha ha.  I learn something new every day.

Bill

[freepow]

@  ALL, thanks for your help, but I need someone to give me a simple diagram of a LED that will light when there is a LOAD,  however, there will be more than one LOAD and each LOAD is seperate and has a on/off switch.
each LOAD is powered by the same 2.5v
See my diagram...