Re: [TCML] capacitor resonance - update

["Chris Swinson" <list@xxxxxxxxxxxxxxxxxxxxxxxxx>]

Hi all,

Let me start again with this problem... Even though the supply was not 
connected, there was my large isolation transformer which was only connected 
to the ground rail , but for some reason was causing problems...


Primary coil on its own, no problem.

Capacitor on its own no problem.

How when they are both connected, I get Fres at 800khz. Which is not 
correct.

I tried a 2.2uF capacitor across the primary and got 37khz as expected, 
though with my variable cap, it does not work.

I tried a fixed 570pF value, Fres > 2mhz works ok.

2x570pF capacitor , Fres ~1.6mhz , works ok.

So the problem lies with when my variable cap is connected across the 
primary. Instead of being around 2mhz, its "stuck" at 800khz and altering 
the capacitor value as no effect.

Apologies for the confusion before.

Chris


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