[sdiy] Reply to all.. how to build a cv keyboard

[Electronium]

Sakke,
I've got some schematics for really simple VCOs VCFs I could send you, if
you like.  They just use basic op amps & FET transistors, etc.  I built
these circuits myself when I first started out.  I still have the modules, &
I kind of like them actually... even though they are linear rather than
exponential.

As far as a keyboard controller, if I were you, I'd probably use some sort
of existing organ keyboard or something and wire it up to a resistor network
outputting linear cv.  And you'll need a gate signal out too, of course.

Then you just need envelope generators (I'd use Barry Klein's CD4001 AR
design), VCAs (a little trickier) and an LFO, etc. and your all set!  sounds
easy right? ; )

Good luck and have patience!

Mike Brown
mike at electronium.com

----- Original Message -----
From: "s.matik" <smatikka at welho.com>
To: "synth diy" <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, September 12, 2002 4:48 PM
Subject: [sdiy] Reply to all.. how to build a cv keyboard


    thanks for all the replies to my hoe ;) to build.. actually all this
fuzz is about my school. i´m going to graduate in the spring to be an
electrician.. (or whatever the name of a person is who repairs broken radios
etc :? ).
what i really wanted was to make a sound generating device which i could
then play.. but i guess building a fully functional synthesizer from nothing
to it´s greatness would be a bit too much for now. has anyone got any
(..simple.. i don´t even know all of the english vocab in synths.. i am
finnish u know..sorry. :-|  ) suggestions for what i could do to make a
simple tone generating device with the same principle as is in real
synthesizers. i´ve looked around and i found that a 555 circuit can be used
as a vco plus i found a simple organ circuit from here
http://www.physicsenterprises.andrews.edu/diy_archive/schematics/synths/penf
old/Fig08.gif maybe with a simple vcf combined it would do the thing for
now. (..i don´t know. maybe yall are just laughing to my funny ideas,
atleast i am ;)
so.. this is my first ever do-it-myself project. all i´ve done this far is
repairing and because the project is for the school, buying everything
doesn´t get me anywhere. i have to DO stuff.
    but still.. maybe a midi-->cv could be a good idea to start with though
(not that i like it as much as i like a real analog keyboard). it´s going to
be a long dark and nasty winter soon, so all i´ve got is time for the next
1/2 year. come and visit sometime and you´ll understand ;) and my enthusiasm
for analog instruments isn´t going anywhere!
..i shoul be sleeping. got to go to school in five hours. damn. good nite

sakke