A look at Arie De Geus Patent No 1032759

[Peterae]

Hi Itsu
Thanks your signal gen + / - is wrong way round if you look at the circuit 0v is on left and positive goes to both caps, well thats how i read it although its not clear, would you place the switch on the neg side of the sig gen output?

[Itsu]

Peter,

OK, i understood the ground point was in between the 2 capacitors, but i see your point about the switch.

Anyway, just change it to how you think it supposes to be connected, adjust the values (capacitance and inductance) and check the signals, they should be close to what you see on the scope. 

Itsu

[Peterae]

Sure 

It also changes where the scope probes 0V is connected to 0V sig gen also not middle of caps. 

[Peterae]

**Note this looks like it maybe a result of connecting a voltmeter across A & B because when i disconnect the meter the resonant frequency changes a lot and i loose the DC offset on the Scope point A, although i have seen a slight DC offset so far it's under 10mv.

At Resonance i do get a dc shift of the level on the point A, placing a Voltmeter across A & B i can measure between 5-6 volts DC but only at max resonance, on the scope i have a DC offset of 37V which is how i think it manifests itself, although the biggest DC voltage is at the lower resonant frequency of around 1Mhz without the phase shift, although a DC offset is present higher up in frequency the DC voltage measured is lower.
So why would A be showing a DC offset, my scope channel is set to 0V center line.

Yellow probe is A
Blue probe is B
0V of signal gen and scope probes is left side of Coil A as per diagram.