[sdiy] Low Pass Gate is soooOOOOooo sweet

[Michael Ruberto]

hi,

referring to the 292c, in this design I am assuming all the connections with 
the designation "a" are grounds, is this correct? then I also see 
connections labeled "N" and "0". this sort of thing can be a bit misleading. 
can somebody clear this up a bit?
also, what's the story with the little extra circuits on the upper right 
side of the drawing?

~M


>From: Peter Grenader <petergrenader at mksound.com>
>To: <synth-diy at dropmix.xs4all.nl>
>Subject: [sdiy] Low Pass Gate is soooOOOOooo sweet
>Date: Tue, 07 May 2002 20:41:45 -0600
>
>Gentlemen and lady (hello to Cynthia),
>
>I need to open by saying Mark Verbos is the most helpful and patient guy in
>Europe.   I owe him my liver.
>
>Secondly, I've built now three low pass gates which closely resemble those
>of THE modern day underworld God of instrument design himself, who's name
>rhymes with 'Mooklah".
>
>Once I got the first one ironed out,(which had about a billion errors in 
>it,
>including some really really stupid component subs on my part), the rest
>were a blink.
>
>About a second after I got them up I did a taste test against a standard,
>non-vactrol based VCA. The verdict:  the Low Pass Gate is the sweetest
>sounding amplitude modifier ever conceived.  It's been 22 years since I've
>snuggled up to these things.  I had forgotten.  There is no comparison for
>short envelopes.
>
>I suggest you all give it a try.  Build an LPG, buy a Borg filter and get
>with it the best-sounding multimode filter to hit the pyke in a decade (my
>opinion), or wait until the mystery mods start showing up by Mr. Mooklah
>himself - but get your hands on one of these things.
>
>If you're as dangerous with a soldering iron in your hand like I am, you
>might consider replacing the 7.5 supply/SPDT switch/ 4016 analog switch
>combo Mark suggests with a singular TPDT switch.  Saves you from worrying
>about the regulated supply and the wiring of the CMOS part altogether.  I
>did this on the last 2 and it was in fact a lot easier.  Another warning -
>there are some unexpected twists and turns in Mr. Mook's schematic layouts.
>The op amp ins are reversed from where you would expect them to be.  Go by
>the pin-outs, you be good.
>
>Get an LPG, you be REAL good.




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