I have had these little SMD solar panels for some time. They put out around 1v and 10 nano amps, with the three in series. After seeing Silders video (http://www.youtube.com/watch?v=hdgu1zJSAB0), Worlds smallest Solar oscillator, I decided to see what I could do with them. This is the result. I first tried another toroid, but my experimental winding failed.So I made this one. With approx 100 turns, then a tap, then another 300 turns, on a small ferrite core, using 0.33mm wire. I did have it working with an SMD transistor, but the legs broke off and I reverted to a 2n2222a. I couldn’t find any smd resistors near the 200k resistance I wanted, so 2 100k through hole resistors are tucked into the middle of the core. The 100uf smd input cap is not doing much, I cant notice any change in performance, I dont think the 10 nano amps from the 1v solar array can fully account for the losses in the cap. I have not seen it flash in ambient light. Its either dimly on, or not on at all. I’m not sure its “Better” than Sliders one, But I think its a bit smaller. The panel size and output is a fraction of Sliders solar array, Although he clearly had a brighter led. No doubt he will be doing a smaller, brighter one soon 
(Make that about 5 hours ago, LOL) While I’m sure I could improve on this a little, there is only so much that can be done with 10 nano watts input power. This does replace my 60mv oscillator as the lowest input power oscillator I have made, Possibly lowest input to a silicon transistor oscillator world record? Due to the amps being so low.
Post time: Feb-10-2017