Homebrew PCBs

Stefan Trethan wrote:
> I am not into radio, but i thought a PIN diode is used to get a variable  
> capacity by changing the bias point.

You are likely thinking of a varicap which
has a change in capacitance of about 2x
when the DC bias imposed upon it varies over
a 0 to ~30V range.

Actually all diodes exhibit this "variable
capacitance" effect, though varicaps are
specifically designed to do so.

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