[sdiy] SSM's, BBD's, CEM's, oh my

[Magnus Danielson]

From: Mark Romberg <mark-romberg at utulsa.edu>
Subject: [sdiy] SSM's, BBD's, CEM's, oh my
Date: Thu, 24 Jun 2004 13:36:21 -0500
Message-ID: <63659986-C60D-11D8-9736-000393D4596C at utulsa.edu>

> a few things to straighten out.
> 1. what is a BBD?

Bucket Brigade Device

It's a line of capacitors and FET transistors where the FETs is clocked so that
they pass on the charge between the capacitors just like a bucket brigade
passes on the buckets of water to help turning out the fire.

Since this is Synth-DIY I guess you should also include another definition:
The device among any which anoys Harry the most. Let's just say he has issues
with BBDs.

CCD is another variant on the same scheme. Popular in cameras these days.

> 2. i was under the impression that the SSM chips are/were in the same 
> family as the CEM chips which are either fantastically difficult or 
> expensive to obtain.  is this not the case? (referring to j. mahoney's 
> email on a polysix filter)

No, they are not the same family. They where rather competing on the same
market. Which you prefer is a matter of taste. Both are approximating
unobtainablility.

> have nice days.

I will, one at a time.

Cheers,
Magnus