[sdiy] Dual power supply solution? - Kits vs 2600

[phillip m gallo]

Tom,

Calling the use of VREF circuits "anal-retentive" does beg the definition of
that characteristic in context to synth devices.  You may be right.

I know that VREFs are an important part of my personal protection a
long-standing intolerance for sources of drift, noise, and instability.
This intolerance is so severe that it may very well meet your definition.

Lot's of equipment, perhaps the majority of equipment, does not implement
VREFs from which crucial sources such as expo current ref/frequency tuning
pots/comparator thresholds are derived.  Much of this equipment is highly
regarded.  If you don't implement them you are in great company.


Secondarily, your SMT adapter boards peeked my interest, how seriously are
you considering making these available?

regards,
p

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of tomg
Sent: Tuesday, June 14, 2005 4:09 PM
To: Harry Bissell Jr; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Dual power supply solution? - Kits vs 2600


Just in case someone might actually believe all
that anal retentive paranoia..That there is something
wrong with the way Arp designed the 2600 or
the way I designed the 3500 series.

Here's a sample of the Widcat SBM. It has 3 VCO4s
3 VCFs, 4 ADSRs, 2 LFOs a bunch of other stuff and
a onboard RXpro... It is all powered from the same
317/377 supply used for the 3500...

I hooked 1 vco to the output. The LFOs to the ADSRs
and the other 2 VCOs to the ADSRs. I am madly turning
all cutoff, freq and fine controls as this was recorded.
Gee Wiz!! What about that? No problem at all!
The little pop is me bumping the mic stand. I would say
kiss my ass....but that would be childish :)

http://www.ele4music.com/pics/wildcat1.wav

Tom



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