[sdiy] Question about CMOS switches

[David]

I honestly can't answer other than I ordered a bunch and am going to try to
use them with a Fatar keybed, and the Doepfer MKE and MTC64 to try to
emulate a single bus keybed to use with the Steiner DuoPhonic keyboard
electronics for my Synthasystem project. I'll share anything interesting I
find when I start playing with them.

The data sheet says turnon time is 1.8ms (max 5 ms) and turn off 0.5 ms (max
2 ms). Maybe that's the advantage to the DG series, much faster response,
100 nS.

David

-- -----Original Message-----
-- From: Barry Klein [mailto:barryklein at cox.net]
-- Sent: Sunday, January 16, 2011 3:18 PM
-- To: David; 'Synth DIY'
-- Subject: Re: [sdiy] Question about CMOS switches
-- 
-- Hey these are interesting...  how are they constructed?
-- How fast are they?  Any downside to using them?
-- Data sheet mentions one use as "Amusement"  hmmm....
-- 
-- Barry
-- 
-- ----- Original Message -----
-- From: "David" <dingebre at 3dphysics.net>
-- To: "'Synth DIY'" <synth-diy at dropmix.xs4all.nl>
-- Sent: Sunday, January 16, 2011 12:38
-- Subject: Re: [sdiy] Question about CMOS switches
-- 
-- 
-- > Why not use something like the Panasonic AQY282EH? It has lower on
-- > resistance and doesn't need a power supply?
-- >
-- > David
-- >
-- >
-- >
-- > -- -----Original Message-----
-- > -- From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
-- > -- bounces at dropmix.xs4all.nl] On Behalf Of Donald Tillman
-- > -- Sent: Sunday, January 16, 2011 11:10 AM
-- > -- To: David G. Dixon
-- > -- Cc: 'Synth DIY'
-- > -- Subject: Re: [sdiy] Question about CMOS switches
-- > --
-- > -- On Jan 15, 2011, at 11:20 PM, David G. Dixon wrote:
-- > --
-- > -- > Here's a quick question for any digital gurus out there:
-- > --
-- > -- (Analog, actually.   :-) )
-- > --
-- > --
-- > -- > Is there any problem driving analog switches in the DG series with
-- > switching
-- > -- > signals that swing to (or near) the rails (provided, of course,
that
-- > the
-- > -- > switches are powered from the rails)?
-- > --
-- > -- Yeah, there is...
-- > --
-- > -- On devices like the DG409, the switch still works, but it injects a
-- > significant amount of
-- > -- charge into the analog lines.   So if you care about charge
injection
-- > you'll need to limit the
-- > -- control voltage swing.
-- > --
-- > -- That's not mentioned in the data sheets; I discovered it the hard
way.
-- > --
-- > --   -- Don
-- > --
-- > -- --
-- > -- Don Tillman
-- > -- Palo Alto, California
-- > -- don at till.com
-- > -- http://www.till.com
-- > --
-- > --
-- > --
-- > --
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