PCB layout for Ian Fritz' AD/AR EG

LFLab · Posted: Mon Dec 12, 2011 1:26 pm Post subject:

I'm building a quad of these using the dual Bugbrand layout. Stuffed the boards but haven't tested them yet. I was wondering about these caps as well, used 3u3 filmcaps. If it works with electrolytics it'll work with flmcaps. I think the envelope generators are unipolar so electrolytics should be ok, i put in film just to be shure.

frijitz · Posted: Mon Dec 12, 2011 1:32 pm Post subject:

furio · Joined: Dec 25, 2009 Posts: 83 Location: Austria

Thanks to all!

I've used a bigger C1x (sorry my post above was written the opposite way C1/C1x)

non-stop meaning it just start without Attack/Decay curves, running without end Wink

maybe I am having difficultie finding some short on the PCB, but I have mixed Electrolytic and Film caps for the timing scratch

I am sorry for being such a bother... but I certainly need advise! I feel I have a better chance of repairing the problem with more help and insight from the outside!

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furio · Joined: Dec 25, 2009 Posts: 83 Location: Austria

Hi to all!

I have solved the problem, it was the MFB MIDI_2_CV or the Doepfer A-140 ADSR connected on the same Gate BUS. For some strange reason it crashed the gate on this interface Smile

With the A-190-3 USB_2_CV 5V Gate or the MIDIMPLAT 15V Gate by Roman Sowa using C1 470n and C1x 4u7 timing caps works fine for me.

The only problem is a too high CV ground sound with my VCA's using the fastest Attack/Decay. Which is the better way to reduce this glitch/click produced by the envelope output to control a VCA_CV?

furio · Joined: Dec 25, 2009 Posts: 83 Location: Austria

I would like to apologize to Mr. Fritz be it that I have made a modification that is without any style! I have only followed my own intuition.. and this is the result thereof... seeing that my knowledge of the electronic world is rather limited! This is what I did.

I cut the trace between the potentiometers and C1 and then jumped with a 8K2 resistor. If I should need to modify another envelope, I'll try some lower values.
Now I have one of the four envelopes which I assembled and found it to be compatible to control all my VCA's.

If someone could help, I attached the drawings for the euro modification to the PCB and my euro panel. I have used Musikding's 5x10cm PCB's, 16 HE/TE (8cm) Euro Panel and Lazertran.

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frijitz · Posted: Thu Dec 15, 2011 2:45 pm Post subject:

Silesius · Joined: Feb 12, 2010 Posts: 61 Location: Berlin

Hi, I'm building a dual AD/AR following Bugbrand layout. I'm testing it and it's working fine. However, I have a question regarding this circuit. I would like to make it retrigger itself, to use it as an LFO as well. My knowledge of electronics is very limited, so I think I'm missing something.
The idea is to use Ken Stone's slope detector circuit. I think that's what I need for the job.
http://www.cgs.synth.net/modules/cgs62_sd.html

I'm using just the fall out portion and it's working nice as well; it outputs a pulse when the envelope falls without problems. Now, I though it would be just a matter of routing this pulse back into the envelope's input, but that's not working. Sometimes everything stops, sometimes it works but very fast, almost in audio range. Too much for using it as LFO...

I know there must be a way for this to work, but I can't see it; any help will be very appreciated.[/img]

elmegil · Posted: Thu Feb 21, 2013 1:03 pm Post subject:

If you're retriggering when it *starts* to fall, you never let the "D" portion of the envelope complete before you're retriggering.

You need to set a level below which it retriggers as well, something close to ground. So you need slope detection and also level detection and a way to combine them to generate the trigger.

Not sure HOW you'd do that off the top of my head though.

frijitz · Posted: Thu Feb 21, 2013 1:46 pm Post subject:

diablojoy · Posted: Thu Feb 21, 2013 1:51 pm Post subject:

use a window comparator circuit with upper threshold near zero volts and lower threshold at zero volts
and then 'AND' that with the 'falling' output of the slope detector, the output of the AND gate will only output a signal when both its inputs are high
so you will only get a retrigger when the EG is near to completing its cycle

sonicwarrior · Joined: Dec 22, 2005 Posts: 189 Location: Cologne, Germany

frijitz · Posted: Mon Mar 04, 2013 7:57 pm Post subject:

sonicwarrior · Joined: Dec 22, 2005 Posts: 189 Location: Cologne, Germany

For Oakley and MOTM modules I get at least the schematics when I order the corresponding boards. Sad

frijitz · Posted: Wed Mar 06, 2013 8:00 pm Post subject:

sonicwarrior · Joined: Dec 22, 2005 Posts: 189 Location: Cologne, Germany

Oh, I forgot to answer. Embarassed

I'll finish my two existing original All-In EG first before deciding whether to order the advanced one Elby is offering.