Seeking DR envelope ideas
Scott Gravenhorst
music.maker at gte.net
Mon Nov 27 19:00:47 CET 2000
Using diodes, like 1N914 or 1N4148 you can control charge
and discharge rate with separate pots (or fixed resistors
if no variation of attack/decay times are required).
"Kirk" <kirke at bellsouth.net> wrote:
>This is a multi-part message in MIME format.
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>I'd like to add an envelope with nothing more than decay and release =
>control to my velocity
>sensitive VCA CV. I can find ideas for release in simple AR envelope =
>designs but so far I'm
>lost on the decay part. Here's part of the circuit:
>
>
> ____
> / |
> 220K \ GND
> / =20
> \ 100K
> | __/\/\/\___
> | | |
> | | |\ |
> | | | \ |
> | | | \ |
> |___|__| _ \ |
> | \ |
> | \|_____________
> | / 5-9.4 volts
> 100K | / to sh-101 =20
> 5vdc___/\/\/\/-+--+--| + / VCA control
> | | | /
>0-10v CV ___/\/\/\/-+ | | /
>from demux 220K --- |/
>buffer of ---
>midi2cv8 | 22n
>velocity CV |
> GND
>
>
>I hope this asci art is readable, if not you could try viewing it with a =
>fixed width
>font like Fixedsys in MS Windows. If anyone has any ideas they could =
>share I'd be
>grateful.
>
>Thanks,
>
>Kirk
>
>
>
>
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><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
><HTML><HEAD>
><META content=3D"text/html; charset=3Diso-8859-1" =
>http-equiv=3DContent-Type>
><META content=3D"MSHTML 5.00.2919.6307" name=3DGENERATOR>
><STYLE></STYLE>
></HEAD>
><BODY bgColor=3D#ffffff>
><DIV>
><DIV><FONT face=3DFixedsys>I'd like to add an envelope with nothing more =
>than=20
>decay and release control to my velocity<BR>sensitive VCA CV. I can find =
>ideas=20
>for release in simple AR envelope designs but so far I'm<BR>lost on the =
>decay=20
>part. Here's part of the circuit:</FONT></DIV>
><DIV> </DIV>
><DIV> </DIV>
><DIV><FONT=20
>face=3DFixedsys> &nb=
>sp; =20
>____<BR> =
>; =20
>/ =20
>|<BR> &n=
>bsp; =20
>220K \ =20
>GND<BR> =
> =20
>/ <BR> =20
> =
>
>\ =20
>100K<BR> =
>; =20
>| =20
>__/\/\/\___<BR> &nbs=
>p; =20
>| | =20
>|<BR> &n=
>bsp; =20
>| | |\ =20
>|<BR> &n=
>bsp; =20
>| | | \ =20
>|<BR> &n=
>bsp; =20
>| | | \ =20
>|<BR> &n=
>bsp; =20
>|___|__| _ \ =20
>|<BR> &n=
>bsp; &nb=
>sp; =20
>| \=20
>|<BR> &n=
>bsp; &nb=
>sp; =20
>| =20
>\|_____________<BR> =
> &=
>nbsp; =20
>| / 5-9.4=20
>volts<BR> &nbs=
>p; =20
>100K | =20
>/ to sh-101 =20
><BR> 5vdc___/\/\/\/-+--+--| +=20
>/ VCA=20
>control<BR> &n=
>bsp; =20
>| | | /<BR>0-10v CV ___/\/\/\/-+ | | =
>
>/<BR>from demux 220K --- =
>|/<BR>buffer=20
>of =
>; =20
>---<BR>midi2cv8 &nbs=
>p; =20
>| 22n<BR>velocity=20
>CV =
>;=20
>|<BR> &n=
>bsp; =20
>GND</FONT></DIV>
><DIV> </DIV>
><DIV> </DIV>
><DIV><FONT face=3DFixedsys>I hope this asci art is readable, if not you =
>could try=20
>viewing it with a fixed width</FONT></DIV>
><DIV><FONT face=3DFixedsys>font like Fixedsys in MS Windows. If =
>anyone has=20
>any ideas they could share I'd be</FONT></DIV>
><DIV><FONT face=3DFixedsys>grateful.</FONT></DIV>
><DIV> </DIV>
><DIV><FONT face=3DFixedsys>Thanks,</FONT></DIV>
><DIV> </DIV>
><DIV><FONT face=3DFixedsys>Kirk</FONT></DIV>
><DIV> </DIV>
><DIV> </DIV>
><DIV> </DIV></DIV></BODY></HTML>
>
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-- Scott Gravenhorst : On The Edge, but the Edge of What?
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