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rjd2
Joined: Sep 02, 2007
Posts: 236
Location: philly
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 Posted: Wed Jan 14, 2009 11:28 am Post subject:
What are all the ADSR's out there to build? |
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| 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
Joined: Nov 17, 2006
Posts: 37
Location: Dallas, Texas
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| Posted: Wed Jan 14, 2009 11:41 am Post subject:
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| MOTM still sells PCB's for their ADSR. |
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RF
Joined: Mar 23, 2007
Posts: 1502
Location: Northern Minnesota, USA
Audio files: 28
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scriptstyle
Joined: Jan 22, 2008
Posts: 250
Location: nj
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| Posted: Wed Jan 14, 2009 1:42 pm Post subject:
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| 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
Posts: 454
Location: London, UK
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| Posted: Wed Jan 14, 2009 1:55 pm Post subject:
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| 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
Joined: Jun 24, 2005
Posts: 708
Location: cleve
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BananaPlug
Joined: Jul 04, 2007
Posts: 307
Location: Philly
Audio files: 5
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Wed Jan 14, 2009 4:33 pm Post subject:
Re: What are all the ADSR's out there to build? |
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| 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.
Ian |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Wed Jan 14, 2009 5:16 pm Post subject:
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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
Joined: Dec 29, 2006
Posts: 1176
Location: australia
Audio files: 4
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widdly
Joined: Jun 25, 2007
Posts: 268
Location: singapore
G2 patch files: 2
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kas
Joined: Aug 26, 2008
Posts: 15
Location: Greece
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numbernone
Joined: Aug 16, 2006
Posts: 477
Location: new york city
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| Posted: Thu Jan 15, 2009 2:06 pm Post subject:
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| 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
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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synthmonger
Joined: Nov 16, 2006
Posts: 578
Location: flada
Audio files: 3
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| Posted: Wed Jan 21, 2009 11:07 am Post subject:
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| Shouldn't there be negative voltage protection on the EFM's ADSR cv inputs? |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Wed Jan 21, 2009 11:53 am Post subject:
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according to datasheet, yes. i never experienced any problems, though... obviously the CMOS are more sturdy than one would believe
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matthias
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Wed Jan 21, 2009 3:48 pm Post subject:
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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
Posts: 185
Location: Christchurch, New Zealand
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zthee
Joined: Feb 20, 2008
Posts: 414
Location: Stockholm
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| Posted: Wed Jan 28, 2009 4:46 am Post subject:
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| 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!  |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Wed Feb 11, 2009 8:05 am Post subject:
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| 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   :
there is simply not enough current flowing to hurt anything!
rough and dirty
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matthias
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crashlander42
Joined: Oct 21, 2006
Posts: 292
Location: Orlando, FL (US)
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| Posted: Thu Feb 12, 2009 5:38 pm Post subject:
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| 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
Joined: Jan 29, 2009
Posts: 120
Location: Fremantle, Australia
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| Posted: Fri Feb 13, 2009 2:21 am Post subject:
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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
Janitor
Joined: May 16, 2005
Posts: 8932
Location: Birmingham, England, UK
Audio files: 11
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nicolas3141
Joined: May 25, 2007
Posts: 185
Location: Christchurch, New Zealand
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| Posted: Sat Feb 14, 2009 1:45 am Post subject:
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| 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
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Sat Feb 14, 2009 7:59 am Post subject:
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| 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.
Ian
Last edited by frijitz on Sun Feb 15, 2009 1:00 pm; edited 1 time in total |
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