Joule Thief

[jeanna]

Thanks Al,

I just really like the MK design. It has worked from day one. I am surprised you have not tried it yet.

On the subject ot the primary. A center tap makes the thing go in both directions. You wind the whole thing in the same way so any new colored wire just continues the same direction. Once that center tap is in the battery rail the electricity goes both ways.

I can actually show this in my 2 tiered circuit.

One whole light circuit relies on being one side of the 2 directional primary. It isn't a primary anymore once it is on the second tier, but I don't know what else to name it. It goes from the pos rail around the toroid in the opposite way from the other one which also lights a led or fifty in parallel, and it is independent of the other. They relate. I can shut off the flow to either one or both, but what I do to one of them does not always effect any other one.

@Thaelin,
The MK design is doing the thing you are talking about. It isn't a flat pancake, but it is the effect. I tried to describe this this morning. It is just one of those things. It is easy to see, but really hard to describe.

Try making a MK1. I think you will be pleased.

@All,
so, if I have 154 volts and I connect it to a light bulb that requires 120 volts and is rated at 7.5 watts, I should be able to get that to light using the secondary wires . I only need 62.5mA at 120 volts to get to 7.5 watts, so what makes this so hard to achieve? The battery certainly has that much amps ready for draw. I put a lithium in the holder today.

?? ?? ??


jeanna

[xee2]

@ mikem_2au

I think this schematic is correct. Thanks for the help and thanks for taking the time to figure out the Fuji circuit. I am not sure when I will get to it, but I will be trying various ways to eliminate the need to touch the tube to get it light.

[gadgetmall]

I hit over 1000  volts using a darlington tip121 with a 100 {50x2) turn centertapped primary and 108 secondary !!! Its out putting that weird voltage and frequency the fugi does to meters  and over flows the meters . i tried it on 2 meters !! interesting the Tv started to Buzz and Make static and kill the picture .. I am tired its 1:30 am . i will take some pictures tomorrow .
Gadget

[xee2]

This circuit does not seem to have any problem turning on (no need to touch tube to get it to light). 100 turn coil can be either polarity.

[jadaro2600]

Thanks  jadaro

I  am sure that  your reply will help alot

I am calling it quits for  tonight .
It has been one of those days .   
Tomorow I will probably  find sone silly mistake  that   SHOULD be almost impossible to miss . 

I am not real sure about the  frequency thing .

I will have to find  a way to keep it in resonance . 


gary

It's important to note that the capacitor must be COMPLETELY discharged before attempting to get it to work.  I recommend shorting it out with a component lead, or a screw driver ...this tends to snap the circuit on.  DO this only briefly though, or the full amount of current will flow to the base and ruin the transistor.