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Yes watson, anyone can crank out DC from a dynamo, but if you connect the coil to a reed switch and have the coil close at the peak of your hand cranked AC waveform, now you have radiant too, and can do alot more.
Its not magic free energy, its smarter use of what we have and also learning new ways of getting what we need from previously unknown sources.
Also your choice of transistor is important like you found. A sharp attack and decay time is what you need, and for low voltages you need a specific make for that, which would not work for 9v or more, and there you would use power transistors. How many times I thought I could get it brighter with a 9volt and learn that both tranny and LEDs failed in a picosecond.... So if you want to make a hardy JT that can go from 1v to 12, use a MJL21194 which is one of the better power transistors, but if you know you only will work with 1 to 3 v, then 2n2222 mpsa06 or what have you. I think mpsa06 does not make a good JT transistor because you need almost a whole volt to turn it on, however it might have the sharpest rise an fall time, but I was reading a different transistor only needed .2v (but good luck keeping that transistor from frying with any more) , also I think PNP might use less current.
Also, watson, your discovery of a cap acrost the battery reminds me of a stiffler ladder filter... the first part anyway. just caps acrost the + and - terminals, with ferrites going along bothways. Isolates the oscillator from power supply.
Its not magic free energy, its smarter use of what we have and also learning new ways of getting what we need from previously unknown sources.
Also your choice of transistor is important like you found. A sharp attack and decay time is what you need, and for low voltages you need a specific make for that, which would not work for 9v or more, and there you would use power transistors. How many times I thought I could get it brighter with a 9volt and learn that both tranny and LEDs failed in a picosecond.... So if you want to make a hardy JT that can go from 1v to 12, use a MJL21194 which is one of the better power transistors, but if you know you only will work with 1 to 3 v, then 2n2222 mpsa06 or what have you. I think mpsa06 does not make a good JT transistor because you need almost a whole volt to turn it on, however it might have the sharpest rise an fall time, but I was reading a different transistor only needed .2v (but good luck keeping that transistor from frying with any more) , also I think PNP might use less current.
Also, watson, your discovery of a cap acrost the battery reminds me of a stiffler ladder filter... the first part anyway. just caps acrost the + and - terminals, with ferrites going along bothways. Isolates the oscillator from power supply.
And now my mind is going again, so I have questions.
but I wanted to try slayer's circuit. I don't understand the -A -B -C +A +B +C in the section i have circled in red below. It appears to be the coil, are you using a trifilar coil? 
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