Selfcharging cap circuit from Larskro fake or real ?

[gyulasun]

Hi Conrad,

But the magnet is inside the coil and the turning thing on the outside has no function besides indicating the position of the magnet inside the coil.

The "turning thing on the outside" may hold small timing magnets (not shown) to control the reed switch I would guess but maybe there are no such magnets and in this case the main rotor magnets inside the generator should be able to control the reed.

The strange fact in the video is that Larskro is not showing how high the super cap would charge. It should eventually self destruct.

Yes I agree and when Stefan asked how long the setup would run, Larskro answered: 

"Until I stop it with my finger. Yes, it slowly get faster when the voltage climbs." 

Also, at the end of his 1st part video, the LED started to emit a very, very tiny amount of light as the voltage went up to 3.66V or so. LEDs can behave as good voltage limiters like Zeners.

Whether his will power or a hidden battery or air jet runs the setup, probably will turn out in a few days if he discloses further details and videos.

Gyula

[Hoppy]

The key factors here IMO are dielectric absorption as highlighted by Stefan and demonstrated by TK and a very low current pulse motor / generator of the Newman type.

[TinselKoala]

The diode is reverse-biased to the DC voltage from the capacitor and keeps DC current out of the motor coil. In the "loop on" switch position, when the reed switch closes it shorts this diode and allows power to reach the coil. When the reed opens the diode is unshorted and this turns the coil off.
In the "loop off" switch position, the reed switch is just switching the DC input power to the coil directly and caps/LEDs thru the now-fwd biased diode, and the diode is in the right polarity to send the motor coil's collapse spike into the capacitor/LED stack.

[gyulasun]

Hi TinselKoala,

Thanks for explaining the operation, I wrote this to Conrad a bit differently, I did not consider that the reed switch shorts out the diode in the "loop on" position.
Do you think that when the reed switch is off (still in the "loop on" switch position), then the diode does not (half-wave) rectify the AC voltage induced in the coil by the moving rotor magnet(s), provided the induced positive peak amplitude is higher than the DC level in the supercapacitor (plus the diode forward voltage of course)?
Because in these instances current could flow from the coil via the diode to charge the supercapacitor. Of course the timing of the reed switch is critical even if the induced AC voltage could not be higher (by whatever reason) during the off time of the reed than the DC level of the supercapacitor (plus the forward diode drop).

In the "loop off" switch position I 'blindly' accepted someone's remark that the diode blocks the coil's collapse spike from the supercapacitor... my bad.

Nevertheless, It would be good to see some scope shots on Larskro's setup for sure.

Thanks, Gyula

[TinselKoala]

I'm not sure but I think that the thing probably never actually sees AC from the motor coils, except in the sense of the inductive ringing. I think it's operating as a quasi-synchronous pulse motor. So the coil is pulsed once, briefly, during one half of the rotation and coasts the rest of the time. There will be some generator effect during the coasting probably but I can't quite wrap my head around it without actually having a working apparatus in front of me.

I tried another micro relay, had it all wired in, only to discover that it, too, has a diode across the coil. So I'm going to have to build my own little motor I guess. And dig up a plain reed switch from somewhere. Although I have been playing around with a Hall effect sensor; maybe I can get that to substitute for a reed switch.