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What are all the ADSR's out there to build?
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rjd2



Joined: Sep 02, 2007
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PostPosted: Wed Jan 14, 2009 11:28 am    Post subject: What are all the ADSR's out there to build? Reply with quote  Mark this post and the followings unread

for us guys who arent ready to breadboard up a design from scratch, i mean. as my building of modules progresses, it seems to me that the MFOS ADSR is one of the only ones i can come across that's readily available. got 2 stuffed boards of the buchla 281 clone waiting for a panel, but im realizing that i might have the need for 4-8 more "general utility" EG's over the next year or so. in terms of avialable pcb's, what else is out there?
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pristak



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PostPosted: Wed Jan 14, 2009 11:41 am    Post subject: Reply with quote  Mark this post and the followings unread

MOTM still sells PCB's for their ADSR.
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RF



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PostPosted: Wed Jan 14, 2009 11:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Check this out...

Real neat circuit from Ian

http://electro-music.com/forum/topic-24308-0.html&postdays=0&postorder=asc&highlight=envelope

bruce

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scriptstyle



Joined: Jan 22, 2008
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PostPosted: Wed Jan 14, 2009 1:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

i have been on the hunt also, for some easy adsr press n peel layouts. i am thinking either ians or the yusynth one? dose anyone have any feedback vs.?
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LetterBeacon



Joined: Mar 18, 2008
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PostPosted: Wed Jan 14, 2009 1:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

I haven't populated it yet, but I press n peeled the YuSynth one over the weekend and it came out a treat. My best PnP yet.
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fluxmonkey



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PostPosted: Wed Jan 14, 2009 2:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Music from Outerspace: ADSR (http://www.musicfromouterspace.com/analogsynth/ADSR001/ADSR001.html) or AR (http://www.musicfromouterspace.com/analogsynth/DUALARGENERATOR/DUALARGENERATOR.html)


b

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BananaPlug



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PostPosted: Wed Jan 14, 2009 2:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm thinking about this one:
Ian Fritz by way of Bridechamber
http://www.bridechamber.com/bridechamber.com/F%20ADAR.html
"A punchy AD/ AR envelope generator with an additional input that gives you full control over pulse delay and width."
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frijitz



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PostPosted: Wed Jan 14, 2009 4:33 pm    Post subject: Re: What are all the ADSR's out there to build? Reply with quote  Mark this post and the followings unread

rjd2 wrote:
but im realizing that i might have the need for 4-8 more "general utility" EG's over the next year or so. in terms of avialable pcb's, what else is out there?

Depends on your exact needs. My module gives either AD or AR or a fixed-width "AR", with optional delay of the envelope. It's the most versatile design available, I think, but if you want an ADSR envelope then you will need two of 'em. For the standard McMoog ADSR, Yves' design looks good.

Very Happy

Ian
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ericcoleridge



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PostPosted: Wed Jan 14, 2009 5:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

I etched and built this Digisound 80 VC ADSR, the 80-10. It requires the Curtis 3310 envelope chip, which is about $40. But everything else is pretty standard and cheap, so the total cost isn't so bad, and this is a pretty comprehensive VC ADSR.

There's also this Dual Linear VC ADSR from Papareil Synth Labs. It looks pretty cool, with individual LEDs for each envelope stage.
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andrewF



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PostPosted: Wed Jan 14, 2009 5:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

very easy one from Rene Schmitz
a 555, single op-amp & a couple of general purpose trannies
http://www.uni-bonn.de/~uzs159/adsr2.png

There are a few variations of this circuit
Masa921 -
http://masa921.hp.infoseek.co.jp/image/kairo/555adsr2.gif

RJB's expanded version -
http://homepage2.nifty.com/rjb/pdf/rjb_diy_synthe_501a_vca&eg_schem_revA.pdf
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widdly



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PostPosted: Wed Jan 14, 2009 11:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've built 4 of those 555 based ADSR from Rene and they are great. Simple enough to build on perf board. I think the original source is this article (posted on yusynth) http://yusynth.net/archives/Electronics/J-Jacky-ADSR-1980.pdf

For VC ADSR, the electric druid one looks to be the simplest and most flexible.

http://www.electricdruid.net/forums.html?page=projects.envgen7

Another option is Aaron Crams Envylope. It looks pretty comprehensive..

http://www.synthdiy.com/files/2006/EnvyLope_V3.pdf

Jim Patchell has a VC ADSR design based around the CA3280. You might be able to rework it use CA3080's or LM13600.

http://www.oldcrows.net/~patchell/archives/ca3280_10.html

There are a couple of other designs on yusynths article archive..
http://yusynth.net/archives/Electronics/R-Kirschman-ADSR-1980.pdf
http://yusynth.net/archives/ElectronicDesign/O-Gabor-ADSR-1980.pdf

Last edited by widdly on Thu Aug 05, 2010 10:03 pm; edited 1 time in total
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kas



Joined: Aug 26, 2008
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PostPosted: Thu Jan 15, 2009 1:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

You also have 2 PCBs froam Oakley Modular:
1.http://www.oakleysound.com/vc-adsr.htm
2.http://www.oakleysound.com/adsr.htm
I have the first PCB but didn't have the time to finish yet..I'll post when I will finish it.

Loukas
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numbernone



Joined: Aug 16, 2006
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PostPosted: Thu Jan 15, 2009 2:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

I am going to try and start building out the boards I had made for Thomas Henry's ADSR for the 21st Century this weekend. I will report back with how it went. Dont think I have seen a lower part count (CHEAP) ADSR before. The layout also ended up being truly TINY, which I always love.
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fonik



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PostPosted: Thu Jan 15, 2009 2:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

what about the EFM VC ADSR/LFO? a unique design, isn't it? currently no PCB available, though. i tried to contact tom gamble concerning the possibility of doing a PCB for this one, but have had no success until now.
http://www.modular.fonik.de/files/EFMforum/orgEFMfiles/vcradsr.pdf

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synthmonger



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PostPosted: Wed Jan 21, 2009 11:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Shouldn't there be negative voltage protection on the EFM's ADSR cv inputs?
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fonik



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PostPosted: Wed Jan 21, 2009 11:53 am    Post subject: Reply with quote  Mark this post and the followings unread

according to datasheet, yes. i never experienced any problems, though... obviously the CMOS are more sturdy than one would believe Very Happy
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ericcoleridge



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PostPosted: Wed Jan 21, 2009 3:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

widdly wrote:

Another option is Aaron Crams Envylope. It looks pretty comprehensive..

http://www.synthdiy.com/files/2006/EnvyLope_V3.pdf


Are there any PCB/layouts around for the Envylope? I hadn't looked closely at this module before now; It's pretty incredible and not unlike the Buchla Function Gen or Serge USG.
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nicolas3141



Joined: May 25, 2007
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PostPosted: Wed Jan 28, 2009 2:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Here's my ultra simple ADSR that can also retrigger itself to behave like an LFO. Mine is running off +/-9V with an LM324 doing the business. You might need to tweak a few resistors around the gate input area if you wanted to go to +/-15V, but probably not by much. Log pots are preferable. If you want to have lots of ADSRs in your synth a simple design like this makes it feasible.


adsr.JPG
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My ultra simple ADSR that can also retrigger itself to behave like an LFO. +/-9V with an LM324 doing the business. Log pots are preferable.
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zthee



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PostPosted: Wed Jan 28, 2009 4:46 am    Post subject: Reply with quote  Mark this post and the followings unread

ericcoleridge wrote:
Are there any PCB/layouts around for the Envylope?


I was wondering this aswell..

I'd love to see a board of it! Smile
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fonik



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PostPosted: Wed Feb 11, 2009 8:05 am    Post subject: Reply with quote  Mark this post and the followings unread

synthmonger wrote:
Shouldn't there be negative voltage protection on the EFM's ADSR cv inputs?

i reviewed the old EFM forums files and tom himself once answered this question Laughing Shocked :

there is simply not enough current flowing to hurt anything!
rough and dirty Very Happy

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crashlander42



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PostPosted: Thu Feb 12, 2009 5:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

nicolas3141 wrote:
Here's my ultra simple ADSR that can also retrigger itself to behave like an LFO. Mine is running off +/-9V with an LM324 doing the business. You might need to tweak a few resistors around the gate input area if you wanted to go to +/-15V, but probably not by much. Log pots are preferable. If you want to have lots of ADSRs in your synth a simple design like this makes it feasible.


That looks really simple and interesting. I could easily fit 4 of those on a protoboard. Has anyone else tried this design under +/-15v? I may give it a shot.

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forbin



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PostPosted: Fri Feb 13, 2009 2:21 am    Post subject: Reply with quote  Mark this post and the followings unread

There is a layout of the Envylope -- well sort of -- The design of the Envylope is based very heavily on the design by Jurgen Haible (as the acknowledgement states). The Bergfotron by Jorgen Bergfors is also based on this design and has a very nice PCB layout. I must admit to not having made it yet but it looks very neat.

Check it out at:

http://hem.bredband.net/bersyn/eg.htm

I have actually started on making this module earlier this week and hopefully in the next couple of weeks will be able to let you all know how i went!
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v-un-v
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PostPosted: Fri Feb 13, 2009 2:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Don't forget Topp's Buchla 281 clone thread!

This babe can do all that and loads more! Cool

http://electro-music.com/forum/topic-23218.html&postorder=asc
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nicolas3141



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PostPosted: Sat Feb 14, 2009 1:45 am    Post subject: Reply with quote  Mark this post and the followings unread

crashlander42 wrote:
nicolas3141 wrote:
Here's my ultra simple ADSR that can also retrigger itself to behave like an LFO. Mine is running off +/-9V with an LM324 doing the business. You might need to tweak a few resistors around the gate input area if you wanted to go to +/-15V, but probably not by much. Log pots are preferable. If you want to have lots of ADSRs in your synth a simple design like this makes it feasible.


That looks really simple and interesting. I could easily fit 4 of those on a protoboard. Has anyone else tried this design under +/-15v? I may give it a shot.


It works quite similarly to the 555 based ADSRs, but has the LFO capability and only requires a single chip.

+/-15V should be fine without any modification I think. Remember though that the LM324 is only rated for 32V overall. If you build your first one with a socket you may want to try out different op-amps. If you are keen on very slow or very fast envelopes you can change the 10uF capacitor. For very very slow envelopes you may need to switch to a fet input opamp like the TL074, but I have not tried that. Things you may want to tweak are the resistors (10K and 5K) either side of the S pot. Tweak the 10K so that the sustain level is at zero volts when the pot is fully turned to the left. Tweak the 5K so that the max sustain level is around the same level as the attack peak. The exact values you need are dependent on the type of op-amp you use.

I have built mine with a switch to switch it into LFO mode, where it retriggers itself. But if you are building more than one I suggest you have retrigger out and trigger in sockets instead (put a 10K resistor between the board and the socket to protect against short circuits). That way you can connect up a pair (or more) cross triggering each other. This allows you to have a kind of LFO which can alternate between fast and slow, etc. Very cool.

I built mine on stripboard. I will post the layout when I find it.

Cheers,
Nicolas
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frijitz



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PostPosted: Sat Feb 14, 2009 7:59 am    Post subject: Reply with quote  Mark this post and the followings unread

nicolas3141 wrote:
Here's my ultra simple ADSR that can also retrigger itself to behave like an LFO.

Nicolas --

Nice design! What happens when there is no gate and you feed in an external trigger pulse? When the latch resets after the attack phase, both the "D" and "R" pots are contributing? It looks like there could be some intertesting compound decays.

Very Happy

Ian

Last edited by frijitz on Sun Feb 15, 2009 1:00 pm; edited 1 time in total
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