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WTDiscuss having someone mod my FreqCentral ADSR
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author WTDiscuss having someone mod my FreqCentral ADSR
BlinkyLights
http://www.frequencycentral.co.uk/?page_id=827

I love this ADSR. I lives next to my Roland 510 as a part of my euro Roland voice. I wiggle it often. Works great. But I only have two hands... so what I want to do is to be able to CV modulate the A and R stages, independently of course. I take it I'll need an Attenuator/verter thing to dial in the sweet spot for each, but that aside - the mod seems straight forward for the Engineer sort. Is it?

That's "all" I want to have someone add. Everything else about the thing is great.

What's that going to set me back, give or take? I make the assumption it's possible... it's an analog ADSR based on a classic Roland circuit after all, not hieroglyphics... smile I figure someone can sort this out, without hurting anything about the rest of it. Is this true?

Anyone?

Thanks in advance.
nigel
BlinkyLights wrote:
... so what I want to do is to be able to CV modulate the A and R stages, independently of course. I take it I'll need an Attenuator/verter thing to dial in the sweet spot for each, but that aside - the mod seems straight forward for the Engineer sort. Is it?

Short answer, without seeing the circuit, is probably "no". Replacing a pot with voltage control is not usually a simple thing to do.
Longer answer (again, without knowing how the circuit is designed, but making some assumptions) is that the simplest mod would be to replace the A and R pots with vactrols, and add some circuitry to drive them. However, the control would be very non-linear (which may be what you want anyway), and you would probably lose either the fastest or slowest end of the attack and decay times.
A complete solution (with smooth voltage control over a similar range to the original) would involve a substantial reworking of the circuit. This is why voltage controlled envelope generators are much less common than manual ones.
cnicht
Use a CEM3310 (or equivalent) or http://jhaible.com/legacy/tonline_stuff/hj_vc_hadsr.html or https://electricdruid.net/product/envgen8/
mskala
nigel wrote:
Short answer, without seeing the circuit, is probably "no". Replacing a pot with voltage control is not usually a simple thing to do.


Yeah... in general, a circuit that is voltage controlled is a different circuit, not a modification of a similar-function non-voltage-controlled circuit. The "mod" to get from one to the other is to throw away the old one and build a new one. Saying it's analog so it's simple, or I don't want to change anything else so it's not a big job, are both actually things likely to make the project more difficult.

This question comes up often enough that I wrote an article for it: https://northcoastsynthesis.com/news/voltage-control-modifications/

In the original poster's specific case, Vactrols might be one way to go, but digi-pots might also be worth looking at. Both approaches have serious limitations.

And as you said, that's after we get the schematic to look at. Not much possibility to even talk intelligently about the specific case without seeing the schematic.
BlinkyLights
Aren't there kits (Vactrols of some sort, IIRC) that let you have CV control over most any regular Pot on a pedal or module or anything else that uses normal Pots for vol/etc...?

I figure it's that easy, at least, but I had assumed a more purpose built option was possible.

I'll see if I can find the schematic. Thanks for the respinses so far.
cnicht
There was a thread on here https://muffwiggler.com/forum/viewtopic.php?t=36435
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