Is that a joule thief?

[Groundloop]

@Groundloop: a poster named magpwr showed a circuit and the transistor 2SK170 which lights a LED dimly down to 30 mV input power, I could do it with 50 mV.

Attached you see the circuit based on this transistor.

Greetings, Conrad

Hi Conrad,

Thanks for posting this, I will study the data sheets for the components.

GL.

[Groundloop]

My JT battery voltage is now [02.05.2013 2018] at 0,893 Volt. This is a drop of
0,038 Volt during approx. 10 hours. The LED light is steady and very dim.

GL.

[Groundloop]

My JT battery voltage is now [03.05.2013 0818] at 0,888 Volt. This is a drop of
0,005 Volt during 12 hours. The LED light is flickering and very dim.

GL.

[Groundloop]

My JT battery voltage is now [03.05.2013 2018] at 0,889 Volt. This is a increase of
0,001 Volt during 12 hours. The LED light is flickering and very dim.

GL.

[Groundloop]

My JT circuit did stop oscillating tonight. No light in the LED and no signal received in my spectrum analyzer.
The battery voltage today was 0,885 Volt. My next attempt to fully drain the batteries will be a J-Fet circuit
(as posted by Conrad). But first I have to find some J-Fet transistors.....................  :-)

GL.