Is that a joule thief?

[Groundloop]

My JT battery voltage is now [30.04.2013 0630] at 1,147 Volt. This is a drop of
0,157 Volt during 9 hours. The LED is light very dimly.

GL.

[Groundloop]

My JT battery voltage is now [30.04.2013 1730] at 1,032 Volt. This is a drop of
0,115 Volt during 11 hours. The LED is light very very dimly. So, how long until
we reach zero Volt on the batteries?

GL.

[TinselKoala]

I dunno, I'm too lazy to plot the curve and project it out. But won't your JT stop oscillating at around 0.4 V or so?

[Groundloop]

I dunno, I'm too lazy to plot the curve and project it out. But won't your JT stop oscillating at around 0.4 V or so?

TK,

A typical JT can't start to oscillate if the base voltage bias is below the level needed by the transistor, but
once started, the oscillator will happily oscillate down to 0,1 Volt because the pulses in the trigger coil
is higher than the approx. 0,6 Volt base voltage needed to trigger the transistor. That said, my LED brightness
is now down to almost nothing. So I think I will stop the drain down test soon.

GL.

[Groundloop]

My JT battery voltage is now [01.05.2013 0530] at 0,970 Volt. This is a drop of
0,062 Volt during 12 hours. The LED is light very very dimly, almost off.

GL.