Self running coil?

[NextGen67]

In my opinion: No. For one, the Supply as positioned in the wiki image is not needed for Luc's circuit.

Your 'adviser' knows by the way that the battery is disconnected after an initial cap charge?

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NextGen67

I think he does, and I bet he would say: after the cap is disconnected the voltage rise is due to leakage from the mosfet.

Sorry for the back and forth, but I know very very little about electronics and he is an EE so I can't really question his judgement.

It's ok, I think your 'adviser' would be right with your bet. Ha maybe you ask again to confirm and see if your bet comes true. Without the supply, the cap is not parallel with it anymore by the way [since it is not there], and the leakage from the mosfet is also not parallel with the Cap, at least not directly, but via the Gate, through the Drain.

Hmm, which I just now realize poses something.... The leakage goes from the Gate through the Drain, and then through the 6.9 ohm coil resistance, and then back into the Cap.... The cap can -with correct tuning- gain charge.

Huh, I think it should be possible to calculate how much current is leaking when we can monitor the voltage raise over the cap during a few minute period [or better said, should be able to calculate how much current goes through the circuit]? The Caps are 3900uF each at how many volt? Ok... It's way to late here. I'll sleep first and tomorrow see what I can do. (It's actually early morning so to speak already haha).

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NextGen67

[derricka]

FYI, Here's a great little oscillator.
Linear Technology's  LTC1799     (5Khz-33MHZ)
Typically draws only 1ma from 5v Supply.
Requires only 1 external resistor and capacitor to set frequency.
Can be used as VCO.

http://cds.linear.com/docs/Datasheet/1799fbs.pdf

[HarryV]

I should have asked this before, but could someone state the meaning of the letters G, D, and S in gotoluc circuit diagram?

[e2matrix]

G= gate
D= drain
S= source

IIRC = if I recall correctly

[derricka]

@Harry
The letters refer to the wiring terminals (pinouts) on the MOSFET.
G-Gate
D-Drain
S-Source

http://en.wikipedia.org/wiki/Mosfet