Author |
Message |
mikeb
Joined: Nov 20, 2006 Posts: 59 Location: The Automotive Capital of Canada
|
Posted: Mon Nov 04, 2019 7:51 pm Post subject:
Envelope Generator CV output? 0-5V? 0-10V? 0-? |
|
|
Building a very small euro EG and I'm wondering what everyone is used to their EG's outputting. I have some old stuff that outputs 0-10V and a lot of new stuff outputs 0-5V.
Any preferences here? |
|
Back to top
|
|
|
gabbagabi
Joined: Nov 29, 2008 Posts: 651 Location: Berlin by n8
Audio files: 23
|
Posted: Wed Nov 06, 2019 10:55 am Post subject:
|
|
|
one could say more=better, more amplitude gives u more opportunities
e.g. if your vca is only reaching unity gain at 7V, u would never reach unity gain with a 5V envelope
if your VCA is reaching unity gain at 5V, u could overdrive him with a 7V envelope and archive some wanted distortion to enrich the archiveable sound spectrum |
|
Back to top
|
|
|
Ricko
Joined: Dec 25, 2007 Posts: 251 Location: Sydney, Australia
Audio files: 27
|
Posted: Wed Nov 06, 2019 3:21 pm Post subject:
|
|
|
Every diffrrent VCA differs in what input CV produces unity gain. What is more standardized are the EG levels. Provide a pot on the VCA.
The appropriate level depends on the format of the module. (A worthwhile rule-of-thumb might be you want to be able to mix two signals together and not be over the supply rails: so this means 6V max for Eurorack and 7.5V max for the larger 15V systems. But it is more important to follow the original published specs for the format.)
If it is for large format like Dotcom, then control voltages are from 0 to 10V. Ditto Roland system 700 and System 100m.
Moog modular's 902 maximum VCA level comes with 6V input, if that helps.
If it is for Eurorack, then follow the numbers in Doepfer's specification, which is 7V for EG. 5V is just too little. (If you are doing a dynamic envelope, the upper limit shouldnt be much more than about 7V. And never over 10V. )
(The reason some people generate 5V or 3.3V is, I think, because of the entirely slack reason that this is the power supply of their digital circuits. They want to have shallow modules to fit some bizzarely shallow skiff, so they need to skimp on components like buffers.)
In general, an EG can err on the side of too loud rather than too soft, because so many VCA have a level pot built in. And a Eurorack VCA should be capable of 2x output, because so many slack/lazy/harried people choose to adopt VCO circuits from other formats without correcting the signal level. |
|
Back to top
|
|
|
Cynosure
Site Admin
Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
Audio files: 82
|
Posted: Sun Nov 10, 2019 9:42 am Post subject:
|
|
|
Ricko wrote: | If it is for Eurorack, then follow the numbers in Doepfer's specification, which is 7V for EG. |
It says 0 to +8V for Eurorack: http://www.doepfer.de/a100_man/a100t_e.htm
If created digitally at 5V, then just use an amplifying buffer on the output. _________________ JacobWatters.com |
|
Back to top
|
|
|
|