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nikitralala
Joined: May 07, 2009 Posts: 7 Location: berlin
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Posted: Mon Dec 01, 2014 1:18 am Post subject:
Variable Gate Length Subject description: Circuit, Schematics for Analog Sequencer with Variable Gate Length |
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Dear Community,
May this has been already a topic but i could not find anything.
I wish to have an analoge sequencer with a row of pots for a variable gate length. I built several DIY-sequencers on CMOS-technic, but they all have fixed gate length. Has anyone a schematic of a circuit that does this task. I found some on the net but they did not work out. not shure, if I was the bad one or the schematic.
I am not able to developpe such a circuit by myself as I only start to understand the architekture of a circuit if I see it done.
so any help is most welcome...
*niki |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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richardc64
Joined: Jun 01, 2006 Posts: 679 Location: NYC
Audio files: 26
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piedwagtail
Joined: Apr 15, 2006 Posts: 297 Location: shoreditch
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DUBmatze
Joined: Feb 18, 2013 Posts: 150 Location: south Germaica (schwabilon)
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Posted: Tue Dec 02, 2014 11:48 am Post subject:
Re: Variable Gate Length Subject description: Circuit, Schematics for Analog Sequencer with Variable Gate Length |
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nikitralala wrote: | Dear Community,
May this has been already a topic but i could not find anything.
I wish to have an analoge sequencer with a row of pots for a variable gate length. I built several DIY-sequencers on CMOS-technic, but they all have fixed gate length. Has anyone a schematic of a circuit that does this task. I found some on the net but they did not work out. not shure, if I was the bad one or the schematic.
I am not able to developpe such a circuit by myself as I only start to understand the architekture of a circuit if I see it done.
so any help is most welcome...
*niki |
circuit:
http://www.sequencer.de/synthesizer/download/file.php?id=12663&mode=view
Forum Post: (is german)
http://www.sequencer.de/synthesizer/viewtopic.php?f=13&t=94971&start=25#p1100261 |
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J3RK
Joined: Jun 05, 2006 Posts: 123 Location: Seattle
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Posted: Tue Dec 02, 2014 12:07 pm Post subject:
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You could do this with a monostable circuit. |
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richardc64
Joined: Jun 01, 2006 Posts: 679 Location: NYC
Audio files: 26
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Posted: Tue Dec 02, 2014 1:21 pm Post subject:
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J3RK wrote: | You could do this with a monostable circuit. |
That's what Phobos' circuit is. I suggested voltage controlling the duration.
I fucking hate forums that don't let the unregistered view circuits.
Quote: | Du hast keine Berechtigung, diesen Dateianhang herunterzuladen. |
Blow me. Last edited by richardc64 on Tue Dec 02, 2014 1:24 pm; edited 1 time in total |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Tue Dec 02, 2014 1:23 pm Post subject:
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richardc64 wrote: | I fucking hate forums that don't let the unregistered view circuits. |
I clicked it away pretty quickly too. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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DUBmatze
Joined: Feb 18, 2013 Posts: 150 Location: south Germaica (schwabilon)
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Posted: Tue Dec 02, 2014 1:46 pm Post subject:
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ups sory, i didnt notice that.
its simple circuit. with a 4049/4050 .... and a CR in between to make the gate shorter (but only this way) . think i posted this somwehre here also but cant find at the moment. |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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elektrouwe
Joined: May 27, 2012 Posts: 143 Location: Germany
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Posted: Wed Dec 03, 2014 9:57 am Post subject:
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hallo Niki,
it's not only a circuit question. What behaviour do you want ?
1)chain of independent one-shots, last one-shot triggers the first
as soon as you touch 1 of the 8 potentiometers, you are off-beat and can't sync/play along such a with other rhythmic instruments. This is perhaps only useful for "free (like in free jazz) noise sessions"
2)chain of independent one-shots, 1st one-shot is triggered (hard-synced) by external measure-clock
this allows "arrythmic" pattern inside the measure, but measure tempo is not affected when you twist your knobs
3) every trigger can be set 0..100% time (analog resolution) of 1 measure
then you can change tempo and sync to external beats while having strange pattern inside the measure.
I have realized this in my TARB (true analog rhythm box) project this way :
a master sawtooth VCO with a 24 to 240 BPM range creates 1 rising slope per measure.
comparators with -inputs connected to this timing sawtooth and +input connected to CV potentiometers
(or other CV sources) generate triggers @ any position inside the measure. TARB uses all posibilities
of a modular CV synth to modulate rhythms.
Maybe that is what you want finally |
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J3RK
Joined: Jun 05, 2006 Posts: 123 Location: Seattle
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Posted: Fri Dec 05, 2014 3:25 pm Post subject:
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richardc64 wrote: | That's what Phobos' circuit is. I suggested voltage controlling the duration.
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Ah, I didn't look closely. I've built a few transistor monostable circuits, and they work pretty well. I haven't tried voltage control over the length though, just manual. |
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piedwagtail
Joined: Apr 15, 2006 Posts: 297 Location: shoreditch
Audio files: 3
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nikitralala
Joined: May 07, 2009 Posts: 7 Location: berlin
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Posted: Mon Jan 26, 2015 7:49 am Post subject:
Variable Gate Length Subject description: to "elektrouwe" |
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thanks to all of you for these propositions. I will lock at them now, as I finally have some time to do so.
and to elektrouwe, to answer your question.
it is mostly, what you describe under point 3:
I a want to have a sequence in a fixed timegrid/clock.
but I want to have different note length, each step should be able to have its own length. (in a midi-system this is done in a second )
so I need a variable gate length to control the length of the adsr or similar...
I understand your solution and will try it also. So if I want to have it controlled by an extern clock I could use a sawtooth from a LFO generator... |
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nikitralala
Joined: May 07, 2009 Posts: 7 Location: berlin
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Posted: Mon Jan 26, 2015 7:51 am Post subject:
Variable Gate Length Subject description: variable gate |
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I had tryed this one prior to asking here in the forum. It did not work with me. but may I made a mistake... |
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nikitralala
Joined: May 07, 2009 Posts: 7 Location: berlin
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Posted: Tue Jan 05, 2016 5:56 am Post subject:
phobosapiens pulse delay |
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Thanks for all the reply. I took me some time, bevor I could have a look at it. The phobosapiens pulse delay is what I was looking for. It works fine... |
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roglok
Joined: Aug 28, 2010 Posts: 202 Location: uptown
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cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
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Posted: Sun Dec 08, 2019 12:30 pm Post subject:
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Hey there, I've built this same thing but using Arduino Pro Mini clones.
Using arduino, easy to get control of delay, gate length (controllable via pot or CV) as well as switches to ignore gate-off or not. Pretty low parts count.
https://audiodiwhy.blogspot.com/2019/12/gate-delay-part-iii-works.html
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This image has been reduced to fit the page. Click on it to enlarge. |
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7.26 MB |
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_________________ Visit my AUDIODIWHY blog and website |
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kaputtpanzer
Joined: Nov 02, 2009 Posts: 139 Location: Cologne
Audio files: 15
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Posted: Thu Dec 19, 2019 5:48 am Post subject:
Re: Variable Gate Length Subject description: variable gate |
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nikitralala wrote: |
I had tryed this one prior to asking here in the forum. It did not work with me. but may I made a mistake... |
This is actually quite interesting! Personally I would replace teh 40106 gates with an opamp comparator. With removing the trigger converter part at the input and another pot for the attack time, it should be possible to add a trigger delay option. Nice little gem. |
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ryktnk
Joined: Apr 24, 2008 Posts: 285 Location: london
Audio files: 1
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Posted: Sun Dec 22, 2019 10:34 am Post subject:
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Hello
On my old version of M185 sequencer I see a saw wave oscillator for the
clock, then a variable pulse width ‘chopper’ circuit to change the length
of the pulse for the gate, this can all be achieved with one 4069 chip.
But it doesn’t allow for gates longer than one click pulse.
Check out Rene’s elegant simple VCO design that utilises this technique
https://www.schmitzbits.de/vco4069.html
Remove the expo converter, and buffer. Replace the 2n2 with a 2uF cap
for LFO speed clock.
-ryk |
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