Mysterious Resonant Circuit

[gyulasun]

I think you will find he is using the coil and cap to get rid of the nasty noise which is across the battery, i am having the same problem, i have about 2 volts of crap across my battery, and it doesnt go by putting different cap across, he is trying to get a smooth dc across his battery because he can then be confident of the power consumption.
My rendition is running at about 22Mhz, but have not had much chance to refine cap values yet.

Hi Peter,

You sounds like you understand how to get rid of the 'noise' which is across the battery, then why do not you wind an air core coil of  4-6 turns of  0.8 or 1mm Cu (enameled) wire and connect it in series with 15-20pF capacitor to shunt the 2V crap across your battery? 
To find the resonance of your series LC circuit at 22MHz, you simply stretch or squize the turns of the air core coil while you watch your scope showing the 2V crap till you see it starts reducing in amplitude.  Using only capacitors across the battery usually helps in up to some MHz range, unless you buy special capacitors with very low ESR values at your frequency of choice. With the series resonant circuit you effectively improve the shunting effect of the capacitors, like EMdevices has showed.   To make an air core coil, simply choose a cylindrical form of any hard material with 8-15mm diameter like a pencil or biro etc and wind 4-6 or 8 turns on it then fix it.
Sorry for this, I simply wished to ask the above question to help you stepping further on.

rgds,  Gyula

[Peterae]

Hi Guyla

Thanks for the advice, yes i have not had anytime to do this yet, but will be next up after i have tried more transistors to get better operation, i have only had about 3 hours on the build last night and about an hour spent getting it to run.

Peter

[spinner]

So, did anyone prooved if this circuit's "OU" is just a measurement error, or there really is something strange happening?
Thanks!

[Peterae]

Too early for me to say yet, i need to get mine optimzed, and get the noise on the battery cancelled, plus i am using a diferent core as i dont have anything like EM.
As soon as i get some numbers i will post these, but it will be some days, as i have a buisness to run.

Peter

[xee]

This worked for me on a similar circuit to get rid of RF in battery. The advantage is that it does not require tuning. I have not tried it with this circuit.