[time-nuts] re low noise regulators

[Magnus Danielson]

From: Bruce Griffiths <bruce.griffiths at xtra.co.nz>
Subject: Re: [time-nuts] re low noise regulators
Date: Mon, 17 Dec 2007 11:19:05 +1300
Message-ID: <4765A459.5030902 at xtra.co.nz>

> SAIDJACK at aol.com wrote:
> > Hi Bruce,
> >  
> > The capacitors' microphonic sensitivity may actuallyy be more of a factor  
> > here.
> >   
> Are electrolytics microphonic?
> Ferroelectric (X7R, Z5U,Y5V, X5R, etc but not NP0/C0G) ceramic caps are
> microphonic

All caps is more or less microphonic. Even a pair of plates with vacuum between
them are microphonic. However, the higher capacitivity of the dielectrum, the
higher microphonic sensitivity can you expect. You can as always reduce the
microphonic aspect through mechanical design, including wise use of symmetry,
but the effect will always be there. The point being, the effect is always
there, but the coupling degree may be stronger or weaker.

Traditionally electrolytics have not been the main concern thought. But they
are not always the best choice for many other reasons, as you are fully aware.

Cheers,
Magnus