Cgs synth

I've had some time to experiment with Ken's analogic cv processor. I've
found this to be a very useful module for 'automatically' switching
between cv's (recall: 2 sections each with 3 in's; one section with AND
and NAND, other section with OR and NOR), for example, filter fm with an
envelope generator and triangle lfo into the AND section. Also, it can be
used to simple obtain the inverse cv with one input, for example,
inputting increasing stepped cv's from a sequencer (AND output) and
obtaining the 'mirror' image decreasing stepped cv's (NAND output), each
into it's own osc.

Also, I've posted a Schaeffer motm-style front panel to the cgs file
section. You will have to figure out how you are going to attach the pcb
to the front panel. I drilled two holes to mount a motm pcb bracket.
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Ken, in each section I have the designated 1v/oct inputs (one in each
section) trimmed to about 10 cents for an octave each way from middle C.
The 'drift' increases somewhat the more octaves away from middle C that I
go. Should I be able to do better than this? Is it dependent on the
particular IC's that I have used? This is not particularly critical for
me (since I rather prefer some 'musical drift'), but just curious.
Jeff

>Ken, in each section I have the designated 1v/oct inputs (one in each
>section) trimmed to about 10 cents for an octave each way from middle C.
>The 'drift' increases somewhat the more octaves away from middle C that I
>go. Should I be able to do better than this? Is it dependent on the
>particular IC's that I have used? This is not particularly critical for
>me (since I rather prefer some 'musical drift'), but just curious.
>Jeff

Mine, from what I recall, tracks perfectly at 1v/oct, though admittedly
temperature shifts could possibly mess things up. I haven't given it a work
out across extremes of temperature yet. I figure differences in diodes would
be the greatest cause of tracking errors, as this is most likely where
non-lenearities will creep in.

Cheers,

Ken

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Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>