Is that a joule thief?

[Groundloop]

My JT battery voltage is now [27.04.2013 0945] at 2,48 Volt. That is a drop
of 0,03 Volt in 12 hours. LED light is still visible, but very very low. Osc. at 479KHz.

GL.

[Groundloop]

I did a change today. I did add a Neo magnet close to the L2 coil. This did increase
the circuit current use from the batteries. It also made the LED brighter because
of this. The batteries voltage did drop to 1,720 Volt (1600 local time.) I did this to
speed up the battery draw down test. I'm not testing the circuit, I'm testing if a
battery can be fully drained to zero volt or if the "battery self charge effect" will
kick in and keep the voltage at a low level.

My JT battery voltage is now [27.04.2013 2200] at 1,568 Volt. This is a drop of
0,152 Volt during 6 hours. The frequency of the oscillator is now 745KHz with a
lot of harmonics up in the frequency band. But I also can hear an audio tone of
approx. 1KHz modulated from the oscillator, so I think that what I see on the
spectrum analyzer is just over-harmonics of the real oscillator frequency.

GL.

[Jeg]

Dear all
I tried the circuit i posted on the first page, with a 3055 and 24V. Four turns for the feedback, and the internal coil of the flyback as primary. Well, it draws around 4 Amber maximum, and produces around 2KV. What i would like to ask, is why it changes the frequency of resonance according with the length of the spark. I mean, when the output electrodes are very close, the frequency is about 5KHz, and when they are in distance, it goes to 17KHz! Does anyone know why this happen?

[Groundloop]

Dear all
I tried the circuit i posted on the first page, with a 3055 and 24V. Four turns for the feedback, and the internal coil of the flyback as primary. Well, it draws around 4 Amber maximum, and produces around 2KV. What i would like to ask, is why it changes the frequency of resonance according with the length of the spark. I mean, when the output electrodes are very close, the frequency is about 5KHz, and when they are in distance, it goes to 17KHz! Does anyone know why this happen?

Hi Jeg,

The oscillator frequency will change based on how much you load the output.
Higher load will give lower frequency. What are you going to use your circuit for?

GL.

[Jeg]

I will use this output to fire through a rotor spark gap, to a tesla coil. I was just hopping to have this output with a JT for lower pwr consumption..