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RingMad
Joined: Jan 15, 2011 Posts: 427 Location: Montreal, Canada
Audio files: 4
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Posted: Sun Mar 27, 2016 2:45 pm Post subject:
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Finally had some time to document this project, pretty much finished a month ago...
The Octa Consequencer is an 8-step analog sequencer that outputs a control voltage (CV). It's got the usual step on/off and one can set the CV value for each step. The clock speed can be adjusted and there is a hold button. It has a built-in triangle/square VCO with a separate glide control and output. Other outputs are raw CV, CV with adjustable glide (portamento) and gate/trigger. The gate has 2 flavors, either ANDed with the clock thus appearing at every step or remaining on whenever a step is on. Trigger output is the same thing but a short pulse.
This was originally inspired by Dr. Offset's 16 step Up/Down sequencer (it made a great impression on me back in 2010 when I first started getting into electronics, but at the time I didn't see the use of a sequencer). The details of the schematic I filled in from other designs like like the Baby 10, MFOS, etc. Instead of the CD4029, I used the similar CD4516 CMOS presettable counter with a CD4051. Thus one can control the direction, as well as reset the counter to a specified binary value. The clock, direction, preset load and preset value can all be set by external gate signals for extra madness.
For the direction, an "antenna" mode can be selected. This basically makes the up/down pin on the counter chip floating, and it behaves erratically/randomly and responds sometimes to moving one's hands near the box. Fun!
The square windows for the LEDs were made by hand using a nibbler tool, and then behind, isolator/light concentrator boxes made out of cardboard, hot-glued to the enclosure, with some layers of parchment paper for diffusion, colored gels and translucent plastic.
The VU meter shows the CV level for fun, and is illuminated from inside.
I found this build pretty daunting... at some point I was not sure I wanted to finish it, because I just couldn't figure out how to organise the wiring and stuff. Finally I just went for it... it's a bit of a mess inside, but it all works.
Here is a demo video: https://youtu.be/_ZhCQe6FwxU
.:James:.
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the mess inside the Octa Consequencer. |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
Audio files: 16
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Posted: Sun Mar 27, 2016 3:54 pm Post subject:
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You have a real gift for design, RingMad. The outside and the functionality are more important than the guts of the wiring (at least until you have to troubleshoot it! ). |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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bubzy
Joined: Oct 27, 2010 Posts: 594 Location: United Kingdom
Audio files: 64
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RingMad
Joined: Jan 15, 2011 Posts: 427 Location: Montreal, Canada
Audio files: 4
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Posted: Tue Mar 29, 2016 5:30 am Post subject:
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Re the Octa Consequencer...
Thanks folks!
elmegil : Yeah, it took me about a week to debug that mess of wires!
PHOBoS : The meter is smiling at YOU because I got the circuits that handle the external gate signals from one of your schematics . (You know, so that even boxes that produce low-voltage gate signals can work with my box which is using 12V).
.:James:. |
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RingMad
Joined: Jan 15, 2011 Posts: 427 Location: Montreal, Canada
Audio files: 4
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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prgdeltablues
Joined: Sep 25, 2006 Posts: 222 Location: UK
Audio files: 12
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Posted: Tue Apr 05, 2016 8:04 am Post subject:
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Two-thirds of the way through building Ray Wilson's 16-step quantized vari-clock sequencer. Analogue and Digital boards installed and working, just got to build the vari-clock board...
One weird quirk - in reverse mode, the clock runs about 30% faster than in normal mode. No idea why, and haven't bothered to debug as the clock on the digital board will be removed once I've built the third board.
Modded so there are two gate busses available, and also (since I had a spare half op-amp) an output of CV+a 5th.
Biggest panel I've made to date.
Peter
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wackelpeter
Joined: May 05, 2013 Posts: 461 Location: germany
Audio files: 10
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Posted: Tue Apr 05, 2016 10:46 am Post subject:
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wow... looks very nice and impressive plus i've spotted stripboards...
did you made all the blocks for this sequencer on stripboard? Well i'm asking as i for myself always use stripboards and if you managed it to get everything assembled i'm probably giving it a try too... i have a smaller case waiting to be filled and maybe all needed jacks, pot's and boards may fit into it... but usuallly i stay away from builds that wouldn't fit on one of the stripboards i have (100x150mmm or 100x200mm). _________________ https://soundcloud.com/bastian-j |
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prgdeltablues
Joined: Sep 25, 2006 Posts: 222 Location: UK
Audio files: 12
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Posted: Wed Apr 06, 2016 1:47 am Post subject:
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Thanks!. Yes, all my modules are stripboard (except for the Klee). I buy 119 x 455 mm lengths and cut to size (Rapid Electronics in the UK). This makes all my boards 46 rows deep, which fits nicely with my 200mm high panels. This sequencer is a rather massive build - three main boards plus a small distribution board for power and interboard connections (QA-QD). But as usual Ray's excellent descriptions make debugging easier.
Peter |
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AlanP
Joined: Mar 11, 2014 Posts: 746 Location: New Zealand
Audio files: 41
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Posted: Wed Apr 06, 2016 1:54 am Post subject:
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I think I might have a crack at this sequencer sometime. I'm just noodling at the back of my mind how to fit all the pots, switches, jacks, and everything else in 160x100mm (might drop the Fine adjustment pots.) |
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wackelpeter
Joined: May 05, 2013 Posts: 461 Location: germany
Audio files: 10
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Posted: Wed Apr 06, 2016 8:00 am Post subject:
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prgdeltablues wrote: | Thanks!. Yes, all my modules are stripboard (except for the Klee). I buy 119 x 455 mm lengths and cut to size (Rapid Electronics in the UK). This makes all my boards 46 rows deep, which fits nicely with my 200mm high panels. This sequencer is a rather massive build - three main boards plus a small distribution board for power and interboard connections (QA-QD). But as usual Ray's excellent descriptions make debugging easier.
Peter |
119x455mm stripboard i have never seen before... well should finish in my actual clocking/timing build the second pulse divider from Ken Stone, one is already complete and mounted as is the master divider and 2 Gate sequencers, plus few logic elements and gate to trigger converters i spread over the spare places on those boards...
but it would be really great to have a sequencer with variable gate length... i think i must give this a try before starting something else... _________________ https://soundcloud.com/bastian-j |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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AlanP
Joined: Mar 11, 2014 Posts: 746 Location: New Zealand
Audio files: 41
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Posted: Fri Apr 08, 2016 7:29 pm Post subject:
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heh, DB9 connectors... can you even get motherboards with serial ports anymore? |
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L´Andratté
Joined: Sep 23, 2012 Posts: 150 Location: Hamburg, Germany
Audio files: 5
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Posted: Sun Apr 10, 2016 9:28 am Post subject:
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Nice sequencers, ringmad and prgdeltablues, highly masochistic looking, but also totally awesome!
I´m finally putting together a little lofi experimental studio, after having to sell all my stuff due to financial breakdown.
Just kept my Jazz bass and the stuff on the 1st picture.
Phoenix from the ashes
My small Hordijk system (double ):
Twinjolin (Dual Benjolin)
Zuzweitgeist (Dual Zeitgeist)
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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Posted: Sun Apr 17, 2016 9:52 pm Post subject:
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My first full analog module: a four channel basic mixer.
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LFLab
Joined: Dec 17, 2009 Posts: 497 Location: Rosmalen, Netherlands
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Posted: Mon Apr 18, 2016 2:17 am Post subject:
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What's that component near the power connector, a DC-DC converter? |
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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Posted: Mon Apr 18, 2016 2:21 am Post subject:
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Yes, I power my modular with 5volt, and this mixer is powered by 9volt pos and 9volt neg. derived from 5 volt. |
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RingMad
Joined: Jan 15, 2011 Posts: 427 Location: Montreal, Canada
Audio files: 4
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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Posted: Sun Apr 24, 2016 3:58 pm Post subject:
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Finished my dual VCF today.
It has a knob for frequency and q-factor of the filters and cv for them. Both filters have a switch to choose between midi controlled and free, and both have a low-pass and band-pass output.
More detail about the build HERE
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Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
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Posted: Wed Apr 27, 2016 5:09 pm Post subject:
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Made a sequencer.
Can do forward, reverse by switch or external CV (overrides switch).
Manual step, external clock and internal clock.
When switch FREE is up: the sequencer is triggered with internal clock, speed is controlled by potmeter and CV SPD, also a MIDI out is available for each step where the switch (and LED)is on.
When FREE is down, clock comes from clock input ADV, no midi available, but up/down is active.
In both modes the length of the sequence is set with a potmeter, going from 1 to 16 steps.
Two analog outputs, 16 -> and 8 ->, They give the analog representation of the position of the potmeters. Output 8-> gives the output of the pot's 9-16 and can be used for the speed setting of the first 8 steps, give really nice effects.
The TRIG out pulse is active in FREE mode for every step with the switch (and LED) on, in the external clocked mode every step gives a TRIG out signal.
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