Maxx VCS - Changes

[jorgen.bergfors at idg.se]

Well, my (20 years old) RCA CMOS Databook says 20V as absolute maximum supply 
voltage for all 4000-series chips. Has that been changed? 

/Jorgen




MIME:sasami at blaze.net.au on 98-06-26 14.05.52
To: Jorgen Bergfors at IDGSE
cc:  
Subject: Re: Maxx VCS - Changes

CMOS, including 4066 have a limit of 15V. If you go as high as 18v, they
physically explode. I over-revved a generator feeding a cmos based traffic
light controller once. every chip was destroyed, with most physically
blowing apart. It was all over in under 1 second.

Ken

>Isn't the max supply voltage for the 4066 20V? I plan to use +-9V as I
already 
>have +9V in my synth. It powers a Novation Bass Station and is also useful
for 
>stomp box circuits. Anyone else running 4066s and 4053s on +-9 volts?
>
>/Jorgen
>
>P.S. I use the Bass Station as keyboard and MIDI to CV converter, in case 
>you're wondering.
>
>
>
>
>
>MIME:oakley at enterprise.net on 98-06-26 00.41.31
>To: synth-diy at mailhost.bpa.nl @ SMTP 
>cc:  (bcc: Jorgen Bergfors/IDGSE)
>Subject: Re: Maxx VCS - Changes
>
>I like the DG series from analog devices, rather than the 4016/66. Separate
>analogue and digital supplies. The analogue can run off +/- 15 and the
>digits from +5V. The DG-271 is rather nice and it has very low charge
>injection as well. There is a AD part in my VCF module, used in the AD
>envelope and in the triggerable LFO. More expensive, but easier and somehow
>more elegant...
>
>As a side issue; Soundcraft used + and - 7V5 rails for all of its 4066 audio
>switching. Slightly better headroom for the analogue signals compared to +
>and -5V. The op-amps were  run off - and -17V5. Take it to the absolute
>limit.
>
>Regards,
>
>Tony Allgood, Cumbria, UK
>
>e-mail: oakley at enterprise.net
>
>Rack mounted Moog VCF module. Details to be found at...
>
>http://aupe.phys.andrews.edu/diy_archive/schematics/effects/filter.html
>
>
>-----Original Message-----
>From: tomg <tomg at vivid.net>
>To: synth-diy at mailhost.bpa.nl <synth-diy at mailhost.bpa.nl>
>Date: Thursday, June 25, 1998 5:24 AM
>Subject: Maxx VCS - Changes
>
>
>Well that was fast maybe the fastest update my me ever. You see what happend
>was....:) I know better than that I think maybe I rushed it just a
>little..anyway.
>
>The VCS-1A is now the VCS-1B. I changed the 4016 supply to +-5v this allows
>audio to pass correctlly it also changes the CV capibility to a maximum of
>+-
>5v. You give a little you get a little. It changes the 4016 connections to
>the
>339s a little, also added 100K resistors from the in/out jacks to gnd for
>zap
>protection.
>
>Sorry guys...it really did work like it was. It just wasn't right.
>
>-Tom
>
>
>
>
>
>
>
>
>
_______________________________________________________________________
Ken Stone   sasami at blaze.net.au  
Catgirl Paradise <http://www.anime.net/~kens/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>