Joule Thief

[jeanna]

@ jeanna

I would guess that somehow you have made the equivalent of a step down transformer.

Hi xee2,

This may be what it is.
Right now the battery is below 1.1v
It now gives me 7 volts and lights all the lights but not as well.

I think I will recharge and start again before I add too many extra thoughts.

thank you,

jeanna

[Mk1]

@all

I have been working on a mk1 hybrid , with the micro tpu self runnig circuit, and i got a led to stay on for 3 minutes and 55 second, without battery , ok its not really bright , but i just took any cap a had laying around and a 100 k pot, so i put the battery on it for a 1 second and the led say on for over 3 minute , but not flashing , constant on time.

this is still worth work on it.

I have posted the circuit a few pages back. There it is again http://video.google.com/videoplay?docid=-1815461677597553845

Marc

@ hazens1

Try your jt on a button cell i should work , and saving weight for the plane.I can light neons with a lr44 button.

[xee2]

@ jeanna

I posted this on page 220  but I have re-posted it here since I thought you might find it interesting. It shows the same relationship between base resistor value and frequency that your experiments showed. So I think the two experiments confirm each other.

[jeanna]

@xee2,
I do remember that.
Thanks for re posting it here.
In this, you have only used a bjt and you have also shown the same reciprocal frequency to voltage effect by varying the base resistor.

When you measure the voltage as you have drawn it, do you use the legs of the cap for placement of the probes?

thank you,

jeanna

[xee2]

@ jeanna 

When you measure the voltage as you have drawn it, do you use the legs of the cap for placement of the probes?

Yes. The voltmeter and ampmeter were permanently attached as shown during the testing. Frequency was measured by holding probe near collector coil and using capacitive coupling through the air to the probe tip with ground clip to negative of battery.  The frequency counter would not have been able to handle 100 volt input pulses.