[sdiy] SSM2164 last time buys

[David]

George Hearn has done this already. He built a 2040 clone, VCO, ADSR, and a
VCA already in very small and useable potted packages with surface mount
chips.

http://sites.google.com/site/hearnmorley/

David

-- -----Original Message-----
-- From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
-- bounces at dropmix.xs4all.nl] On Behalf Of Joe Grisso
-- Sent: Friday, February 25, 2011 12:23 AM
-- To: Paul Maddox
-- Cc: SynthDIY
-- Subject: Re: [sdiy] SSM2164 last time buys
-- 
-- Well, I know it's a sin to mention this in the SDIY forum (heheh), but
-- I think a SMT discrete VCA could fit into a very tiny space. However,
-- I don't know whether or not a good quality quad discrete VCA could fit
-- into the space that a DIP16 would allow. A simple gilbert multiplier
-- definitely would, but that's quite simple.
-- 
-- Best,
-- 
-- Joe
-- 
-- On Fri, Feb 25, 2011 at 12:18 AM, Paul Maddox
-- <paul.Maddox.mail-list at synth.net> wrote:
-- > The problem is, how much PCB space does his VCA take?
-- > I suspect that using the SSM2164 will give me 4 VCAs in less space
-- > than one discrete one. Plus the matching between them will be a lot
-- > tighter.
-- >
-- > I full appreciate the reason for discrete parts, but in products that
-- > you want to make small, or to keep costs down (Complexity/ease of
-- > setup/PCB size/parts) there's a trade off to be had.
-- >
-- > Paul
-- >
-- > On 25 February 2011 06:55, David <dingebre at 3dphysics.net> wrote:
-- >> It's interesting. In my interaction with Nyle in my Synthasystem
project, I
-- >> asked Nyle why his circuits were essentially all discrete except for a
few
-- >> op amps. His comment was he didn't want to be locked into a specialty
chip.
-- >> He wanted to be able to build his circuits 30 years down the road and
not
-- >> worry about a chip being obsolete. Here I am 35 years later and
building his
-- >> designs with no problem.
-- >>
-- >> The one exception is the MC1495 multiplier in his Ring Modulator.
Although
-- >> Arcade Game Chips has a stock of 30,000, or so he tells me :)
-- >>
-- >> David
-- >>
-- >> -- -----Original Message-----
-- >> -- From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
-- >> -- bounces at dropmix.xs4all.nl] On Behalf Of megaohm
-- >> -- Sent: Thursday, February 24, 2011 11:13 PM
-- >> -- To: Tom Wiltshire
-- >> -- Cc: synthdiy diy
-- >> -- Subject: Re: [sdiy] SSM2164 last time buys
-- >> --
-- >> -- On Thu, Feb 24, 2011 at 9:04 AM, Tom Wiltshire
<TOM at electricdruid.net>
-- >> wrote:
-- >> -- >
-- >> -- > Analog Devices have listed SSM2164 as "Still In Production but
Not
-- >> Recommended for
-- >> -- New Designs", and have "last time buy" by the available product
models
-- >> (leaded devices
-- >> -- became obsolete some while ago).
-- >> -- >
-- >> --
-- >> -- That sucks. I was going to start experimenting with that IC more
-- >> seriously.
-- >> -- I hadn't before because I assumed it would be obsolete soon. I
didn't
-- >> -- think it would be this soon!!!
-- >> --
-- >> -- At least there is the 13700 still. With the right circuit I
actually
-- >> -- prefer these over any specialty IC for VCA circuits.
-- >> -- But...it's just a matter of time before these are gone, too.
-- >> -- Time to go discrete.
-- >> -- _______________________________________________
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-- >>
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-- >>
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-- 
-- 
-- 
-- --
-- Joe Grisso
-- Detachment 3, Ltd.
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