Mysterious Resonant Circuit

[Peterae]

Here's some construction data on the coil.

I have used 13 turns of 0.6mm Single stranded wire tech is at this address
http://www.maplin.co.uk/module.aspx?ModuleNo=6187&doy=30m7

I first laid the White-Yellow-Red wires side by side while winding.

Peter

[aleks]

Hi Aleks,
I understand that in case Peter's present AC voltage drop of 1.72 Vpp is shunted and then it can add to the useful output this it is still far from a COP of 8-10.  How do you mean this I wonder?

Well, when EMdevices measured across connected battery, of course meter shunts it as well, but the reading is still 6V DC (was before double LC filter installed - around 30Vpp AC). Peterae's current unfiltered reading is 1.72Vpp AC (compare it to 30Vpp). I doubt Peterae's meter is wrong, so it must be draw that is really that low. In that case it means COP is way above 1.0. I do not see a problem with my logic, but there can be some problem with measurements? But how it's possible to make a measurement mistake in such a simple circuit? I can only think about amerage which is not 118mA, but around 1A.

BTW, "overunity battery chargers" may also obviously have a much lower voltage reading over connected battery than when measured short-circuited.

[aleks]

Just a reminder that the RMS shortcut Vpk x 0.707 can only be applied to a pure sinewave.

Yes, of course, and in fact there is no need to make speculation as Peterae gave exact cycle RMS values.

[Peterae]

Hi aleks

The results are certainly hard to swallow, i will feel happier when i have a smooth dc across the battery and i have new measurements, i think EM is ahead of me here, i work 6 days a week and have quiet busy evenings so get very little time, but theres no rush to get this right, I certainly am not in a hurry to close the loop right now as i would hate to take any glory away from it's rightfull owner EM.

Good work EM on smoothing that noise out.

I think when closing the loop, the output should be tried with the noise as well as without, just incase the noise is causing the OU effect to manifest, afterall if the loop is closed who cares if there is noise or not.

Peter

[Mannix]

This is a great thread!

Blocking oscillators are so much fun and possibly the key to this.
There exists the possibility that there is a spin going on here

My trouble is that I dont trust digital measurements on ac signals other than mains frequency.

they only way is to build it, get back to dc  and see for oneself

Great work guys...easy instructions.. and low parts count..
"no mass electronics here, just the knowledge of the coils and how they interact with each other"

Lindsay