Re: PCB power planes?

Eeyore wrote:

Martin Griffith wrote:

Eeyore wrote:
John Larkin wrote:

Splitting grounds is usually a bad idea. Except when it's a terrible
idea.
Except when it's audio of course and you don'y want digital return
currents you can hear in the audio ground. In which case pkysically
separated but carefully linked planes are the way to go in order to
direct the currents where you want them to go rather than randomly
anywhere.

Ha.. I remember a student who said he could make a small audio desk
with the equalisers using MF10's.
Never saw him again....I wonder why?

Was that the NatSemi ? switched capacitor filter ?

No surprise there !


You can design rather excellent audio gear with S/C filters. BTDT. Ok, not audio but audio range. It was a Doppler receiver for medical ultrasound. Zero through about 25kHz, dynamic range from here to the Klondike. Noise from clocks and stuff: None. Sold like hotcakes, still in use.

The only reason why S/C filters fell from grace with guys like us was cost. They probably tried to maintain fat profit margins and that backfired.

--
Regards, Joerg

http://www.analogconsultants.com/

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