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 Forum index » DIY Hardware and Software
VC decay/release envelope
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rubendelacosta



Joined: Dec 25, 2005
Posts: 153
Location: lisbon

PostPosted: Tue Jun 05, 2018 6:22 pm    Post subject: VC decay/release envelope Reply with quote  Mark this post and the followings unread

Hi All,

I'm looking for a nice voltage controlled decay/release schematic for a percussive synth that i've been thinking lately.
No need for attack, since it's for a drum synth.

Anyone knows of a good schematics for this?

Best,
Ruben
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Boerge



Joined: Sep 02, 2009
Posts: 70
Location: Germany

PostPosted: Wed Jun 06, 2018 12:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Take the most simple VCADSR you can find and put the A/S inputs to fix voltages. The R or D input gets your control voltage. Job done. Wink
I would probably go for this one:

https://electricdruid.net/voltage-controlled-adsr-envelope-generator-vc-adsr-7b/

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wackelpeter



Joined: May 05, 2013
Posts: 430
Location: germany
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PostPosted: Wed Jun 06, 2018 1:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

The four VC envelopes i have are the Serge VCADSR, VCS and DUSG and the Buchla VC ASD... but all rather complex and most likely Overkill for your needs…

Edit: forgot the Serge 1973 Envelope Generator AR style, but this has as the DUSG no separate CV for each stage

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g.gabba



Joined: Nov 29, 2008
Posts: 463
Location: berlin
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PostPosted: Thu Jun 07, 2018 10:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Boa Tarde,

thx for providing someting to think about!
Find attached an idea for a linear Decay or Sustain Release VC Envelope.

ate logo, gabbagabi


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Blue Hell
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Joined: Apr 03, 2004
Posts: 22592
Location: The Netherlands, Enschede
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G2 patch files: 319

PostPosted: Thu Jun 07, 2018 10:55 am    Post subject: Reply with quote  Mark this post and the followings unread

oh a nice one, and once you have a linear one with time control .. feedback from the output to the time control inputs will give you an exp curve, and hey .. you have an inverted out too .. for log curves :-)
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g.gabba



Joined: Nov 29, 2008
Posts: 463
Location: berlin
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PostPosted: Thu Jun 07, 2018 11:10 am    Post subject: Reply with quote  Mark this post and the followings unread

what?
i didnt know that at all!
thats crazy, is there a name for that kind of feedbag(ck)?

in the simu it works a little bit, but i get not that what iam used to from cap discharging curves, but it worth investigating.

what a perfect surprising evening!

Obrigado meus amigos,
Thx my friends,
surprise
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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Thu Jun 07, 2018 11:19 am    Post subject: Reply with quote  Mark this post and the followings unread

I have no name for it - invent one :)

You may have to fiddle a bit with DC levels maybe?

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g.gabba



Joined: Nov 29, 2008
Posts: 463
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PostPosted: Fri Jun 08, 2018 7:52 am    Post subject: Reply with quote  Mark this post and the followings unread

here is an idea for a AD / ASR
incl. the 2TIMES-LIN-IS-EXPO-mod, which works - the release rollout is not exacly like from a cap discharge - but its only a simulation
i included a fastness pot cos i guess it could be usefull if not nessesary to get fast attacks

so far,
gabbagabi


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Blue Hell
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Joined: Apr 03, 2004
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Location: The Netherlands, Enschede
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PostPosted: Fri Jun 08, 2018 10:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool
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rubendelacosta



Joined: Dec 25, 2005
Posts: 153
Location: lisbon

PostPosted: Mon Jun 11, 2018 3:02 am    Post subject: Reply with quote  Mark this post and the followings unread

wow so many good replies!

Thanks g.gabba for your effort! that looks very cool!
meanwhile i started to play with this simple schematic that i found on this topic:
http://www.electro-music.com/forum/topic-35747-0.html&postdays=0&postorder=asc&highlight=

Followed blue hell's advice on that topic. At first try it works really crappy but after some improvements on the voltage control of the transistor i'm happy with the results.
when i have time i'll post the schematics with the improvements

Best,
Ruben
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g.gabba



Joined: Nov 29, 2008
Posts: 463
Location: berlin
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PostPosted: Mon Jun 11, 2018 7:32 am    Post subject: Reply with quote  Mark this post and the followings unread

youre welcome, it was really fun.
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