Selfcharging cap circuit from Larskro fake or real ?

[Farmhand]

Hey Tinsel, would a logic level mosfet be no good ? Gate threshold voltage is usually 2 v on those. Too Slow ?

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[TinselKoala]

Hey Tinsel, would a logic level mosfet be no good ? Gate threshold voltage is usually 2 v on those. Too Slow ?

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I'm afraid I'm restricted to stock on hand, and the 3205 is the best low-voltage gp mosfet in the box at the moment. I half-heartedly tried with a bipolar but wasn't satisfied, probably could get better if I worked at it a bit. The 3205 performs surprisingly well even half-on, but it does need at least that 4 V. The Hall sensor switches well all the way down to 3V and below, although its spec minimum is 4V. I've just now finished making a video and it's rendering now, should be on YT in an hour or so.
This is the Hall sensor that SparkFun sells on their website. I usually use Allegro Microsystems non-latching sensors so I was a bit suspicious of these and didn't try them out until just a couple days ago, but now I'm a believer, they are robust, hard to damage and switch cleanly even at the low end of the spec.

ETA: I should add that I haven't tested that circuit at over 9 Volts, my rotor isn't balanced well enough, she cannae take the strain, Captain.....   

ETA2: I see that the RFP30N06LE is faster than the 3205 and has Rdss 0.047  ohms, and costs a dollar each. So I will be ordering a couple, if I can cash in enough aluminum cans....

[Farmhand]

Yes I see, I guess if you had one you would have used it, I also have similar issues, if I decide on a new project that requires parts I must wait till I can afford them. Unless I can scrounge them. I can't even recall finding any logic level mosfets in any scrapped equipment.

IRL3705 is an OK part cheap from here - http://www.futurlec.com.au/test13.jsp?category=TRANSMOSFET&category_title=Mosfet%20Transistors&main_menu=TRANSISTOR&sub_menu=TRANSMOSFET

but from there parts take an age to arrive unless paying fast post

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[ZathEros]

Similar motor construction in keppe motor:
http://www.youtube.com/watch?v=APIdIWcBmlE

And Bedini window motor:
http://www.youtube.com/watch?v=MOvo3SnkGyc

Kind regards,
ZathEros7

[hartiberlin]

Lidmotor just posted a first replication and partial success:

https://www.youtube.com/watch?v=b7zZIhRMDDY