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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Jul 09, 2008 1:00 pm Post subject:
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Coriolis wrote: | Will there be boardmounting of pots? |
Ooooohhhh yes. All four in a row, typical MOTM configuration.
Ian |
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Adam-V
Joined: Jan 29, 2007 Posts: 300 Location: Australia
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Posted: Wed Jul 09, 2008 4:27 pm Post subject:
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frijitz wrote: | synthmonger wrote: | Anything against using a 500k-2M pot for attack? |
No, nothing against it if you need long attack times. The only issue will be that you will loose resolution at the low end.
Ian |
I haven't looked at this circuit at all so feel free to shoot me down in flames but instead of using a larger pot, why not add a range switch and switch in some series resistors that are multiples of the existing pot? I reckon that would allow you to keep the low end resolution and give you the extended times you're after. You do need more panel real estate for this though.
Cheers,
Adam-V _________________ Digitalis Effect | Fractured Symmetry (www.spiralsect.com) |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Jul 09, 2008 5:00 pm Post subject:
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Adam-V wrote: | I haven't looked at this circuit at all so feel free to shoot me down in flames but instead of using a larger pot, why not add a range switch and switch in some series resistors that are multiples of the existing pot? I reckon that would allow you to keep the low end resolution and give you the extended times you're after. You do need more panel real estate for this though. |
Sure, why not, if that's what you want.
Ian |
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Fetafarmer
Joined: Jul 29, 2007 Posts: 32
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DGTom
Joined: Dec 08, 2008 Posts: 211 Location: Adelaide
Audio files: 3
G2 patch files: 1
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Posted: Thu Jul 09, 2009 5:12 pm Post subject:
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Wow! Work of art! I love the condensed Buchla look! (are those knobs readily availible? I've seen them a few times in the last few days)
a quad would be super nice! |
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parasitk
Joined: Sep 21, 2008 Posts: 69 Location: NYC
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Thu Jul 09, 2009 6:28 pm Post subject:
Re: Ian Fritz AD/AR (Bridechamber) |
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Fetafarmer wrote: | Recently finished a dual build of Ian's AD/AR, using a pair of the Bridechamber PCBs. The pulse shapers' outputs are normalled to the EG inputs at the jacks, so that I can use both parts of the circuit independently if I need to. I added the truncation circuitry back from Ian's original version....
I've been needing this exact setup in my system forever, and I'm so happy to finally have it that I'll probably follow the advice in the documentation and build another dual set : ) |
Thanks for the report. Glad it works OK for you. Do you find the truncation switch useful? I left it off because it didn't seem to be working the way I thought it would.
Ian |
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Fetafarmer
Joined: Jul 29, 2007 Posts: 32
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Posted: Fri Jul 10, 2009 6:58 am Post subject:
Re: Ian Fritz AD/AR (Bridechamber) |
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frijitz wrote: |
Thanks for the report. Glad it works OK for you. Do you find the truncation switch useful? I left it off because it didn't seem to be working the way I thought it would.
Ian |
This was the last module to get completed before tearing down my synth in preparation for a big move, so I only got one short session with it. The effects of the truncation switch were very subtle in the patches I built, but nonetheless, I'm happy to have it there as an option.
And yes, the knobs are Davies 1913BW.
Cheers,
Kevin |
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creekree
Joined: Mar 30, 2006 Posts: 192 Location: Morgenland Neukölln
Audio files: 1
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Posted: Fri Jul 10, 2009 9:59 am Post subject:
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i will etch one of these dual AR/AD boards too, thanks tom bugs for designing it!
however, one thing that is not completely clear to me: how do you choose between AD and AR modes? is there even a difference? (sorry for my ignorance) |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Fri Jul 10, 2009 4:18 pm Post subject:
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creekree wrote: | however, one thing that is not completely clear to me: how do you choose between AD and AR modes? is there even a difference |
Drive it with a short trigger and you get an AD. Drive it with a gate and you get an AR. An unusual, but simple and sensible response.
Ian |
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drapdap
Joined: Oct 11, 2004 Posts: 204 Location: London
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G2 patch files: 1
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Posted: Tue Jul 14, 2009 12:10 am Post subject:
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And is it possible to cycle these somehow by themselves? |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Tue Jul 14, 2009 8:51 pm Post subject:
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Sorry, no.
Ian |
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creekree
Joined: Mar 30, 2006 Posts: 192 Location: Morgenland Neukölln
Audio files: 1
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Posted: Mon Aug 17, 2009 3:44 am Post subject:
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I finally found some time to build this thing.
I used the PCB version that Tom Bugs designed and included the TRUNCATE switch - but I can not figure out what it is supposed to do!
So far I have used the gate signal from a x0xb0x sequencer to drive the AR/AD generator and I am happy with what I hear, but could someone please tell me that the TRUNCATE switch ought to do? It does nothing on my unit, and I am very sure that it is not because of bad wiring or such...
Also, I want to include a manual trigger button by connecting a pushbuton to +15v and the trigger in jack, but I am afraid that a 15V trigger signal might be a little bit too much... should I add a resistor to GND? Something like 100k maybe?
Thanks! |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Mon Aug 17, 2009 6:47 am Post subject:
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creekree wrote: | I finally found some time to build this thing.
I used the PCB version that Tom Bugs designed and included the TRUNCATE switch - but I can not figure out what it is supposed to do! |
You might want to review some of the earlier posts. I left the truncate switch off the final design because it didn't work exactly like I expected it to. It does have an effect, but it is a bit subtle. It brings the tail of the decay phase to zero a bit more crisply.
Quote: | Also, I want to include a manual trigger button by connecting a pushbuton to +15v and the trigger in jack, but I am afraid that a 15V trigger signal might be a little bit too much... |
A pushbutton will be more like a gate signal. For a pushbutton trigger you would want some kind of RC differentiator to feed the input.
Otherwise the unit is OK?
Ian |
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creekree
Joined: Mar 30, 2006 Posts: 192 Location: Morgenland Neukölln
Audio files: 1
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Posted: Mon Aug 17, 2009 10:31 am Post subject:
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thanks for answering, ian!
so, i guess i'll just not include the truncate switches - i'm glad i didnt drill holes for them on the frontpanel yet.
yes, the unit is working very well, thanks for sharing the details! |
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neandrewthal
Joined: May 11, 2007 Posts: 672 Location: Canada
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Posted: Sat Oct 31, 2009 2:29 pm Post subject:
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Glad I found this thread. I had lots of questions about this circuit but this answered most of them already.
Just a couple more, though. What happens if you drive the pulser with a gate signal instead of a trigger? I guess it will delay like normal, but what happens if the input is still high when the "width" time is up? I am just wondering if it can be used to shrink a gate signal into a trigger if all I have is a gate yet I want an Attack Decay envelope.
Also, if I want to do the opposite and use the unit as a pulse stretcher with no delay, will there be any perceivable delay at all if the pot is set to zero? _________________ " I went through quite a few trannies til I found one I liked" - Wild Zebra |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Tue Nov 10, 2009 6:14 pm Post subject:
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neandrewthal wrote: | What happens if you drive the pulser with a gate signal instead of a trigger? I guess it will delay like normal, but what happens if the input is still high when the "width" time is up? I am just wondering if it can be used to shrink a gate signal into a trigger if all I have is a gate yet I want an Attack Decay envelope. |
The input to the pulser is a comparator followed by a differentiator. So the first one-shot fires when the input crosses a small threshold from below.This one-shot is not retriggerable, so it will always put out the same width pulse. The second one-shot (width) is retriggerable, so it will stay high if repeatedly pulsed at a high rate. Anway, yes, it can be used as a Gate > Trig generator.
Quote: | Also, if I want to do the opposite and use the unit as a pulse stretcher with no delay, will there be any perceivable delay at all if the pot is set to zero? |
The minimum RC time constant is 2.2 ms. So it might barely be noticable, if your ear is sharp enough. I don't notice a problem in my units.
Ian |
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neandrewthal
Joined: May 11, 2007 Posts: 672 Location: Canada
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Posted: Tue Nov 10, 2009 6:35 pm Post subject:
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Cool, thanks Ian. Definitely gonna get 4 of these boards to make love to my quad LPG _________________ " I went through quite a few trannies til I found one I liked" - Wild Zebra |
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Dego
Joined: Apr 22, 2008 Posts: 139 Location: Sweden
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Posted: Fri Nov 13, 2009 6:05 am Post subject:
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Does it run with +/- 9 volt? If you use lm394? |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Fri Nov 13, 2009 10:07 am Post subject:
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Dego wrote: | Does it run with +/- 9 volt? If you use lm394? |
Sorry?
Ian |
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Dego
Joined: Apr 22, 2008 Posts: 139 Location: Sweden
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Posted: Sat Nov 14, 2009 3:23 am Post subject:
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Does the AD/AR circuit run on +/- 9 volt?
If you try this circuit at 9 volt is it better to use the lm 324 insted of tl074(not 394 sorry)? |
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inlifeindeath
Joined: Apr 02, 2010 Posts: 316 Location: Albuquerque, NM
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Posted: Wed Apr 20, 2011 2:04 pm Post subject:
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hey fellas, i'm about to start laying out a board with 6 of the AD/AR circuits on it. i'm going to be using it in conjunction with my lunetta most likely, which runs on a single supply of 9v. I just want to verify that there won't be any issues running the circuit of a single supply (using the LM324). Ian? Tom? Anyone? Thanks! _________________ http://www.youtube.com/user/borisandfef |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Apr 20, 2011 2:42 pm Post subject:
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inlifeindeath wrote: | i'm going to be using it in conjunction with my lunetta most likely, which runs on a single supply of 9v. I just want to verify that there won't be any issues running the circuit of a single supply (using the LM324). |
No way!
Ian |
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inlifeindeath
Joined: Apr 02, 2010 Posts: 316 Location: Albuquerque, NM
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furio
Joined: Dec 25, 2009 Posts: 106 Location: Austria
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