[sdiy] CD405x series power supply question

[Dave Brown]

I modified my PAiA MIDI2CV for my modular using a diode drop for the
negative supply on the CD4051 and it works fine.  I used a 4K7 resistor
feeding the diode to create the -0.7V negative supply.
http://modularsynthesis.com/modules/DJB-017/djb017.htm

Dave

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of The Old Crow
Sent: Tuesday, April 30, 2013 4:46 PM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] CD405x series power supply question

   Hey folks, Crow here.  The specs for the 4052 state an supply voltage
range of 20V for Vee=Vss=0V, and 18V for Vee=-Vdd using split dual supplies
(+/-9V).  I have a case where I need to bias the Vee down about 1V, creating
a 16V supply interval.  While I think this is safe, I have blown these parts
up before with supply voltage games and wanted to ask if anyone has tinkered
with small negative values for Vee on the 4051/4052/4053.  I usually use the
DG508/509 for this sort of thing, but those parts are 8 times as pricey as a
4052 and I am using 2 of them on a project as part of two VC ADSR circuits.

Crow
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