8-Step Sequencer with voltage controllable pattern (VCPS)

janvanvolt · Joined: Nov 24, 2005 Posts: 285 Location: Mainz, Germany

Here's my MOTM Version (which i am currently working on the PCB side).

DSC05046.jpg

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MOTM VCPS

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VCPS2.fpd

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.FPD File (MOTM)

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VCPS2.fpd

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fonik · Posted: Tue Jul 06, 2010 3:33 am Post subject:

i eventually added the calibration procedure
to the current building documentation.

BTW nice one, jan.

Skrog Productions · Posted: Thu Jul 08, 2010 2:08 pm Post subject:

Hi , 99% finished , i love this sequencer , a pleasant project , good documentation and a satisfying new module Smile

.

Just a little problem to solve......
Do i have a problem with my gate ?? , my gate output , when all stages are set to 'on' , the circuit is outputing a constant gate voltage (12v ) (supply is 12v ) traced all the way back to pin 3 of the 40106 .
The trigger pulses as normal on each step change (sometimes with a double pulse) but the gate is constant even at really slow clocking rates.
In adc or off positions the gate seems to act normally.

Thanks

Dave.

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emdot_ambient · Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD

Nice looking blue design there, very logically laid out.

The color scheme reminds me of the design on old Deltalab Effectrons. thumb up

fonik · Posted: Thu Jul 08, 2010 3:29 pm Post subject:

Skrog Productions · Posted: Thu Jul 08, 2010 5:29 pm Post subject:

Ah , ok , i understand now Smile

, silly me Very Happy

.

voltage at gate out on single is 11.22v.
Collector on Q5 11.88v.

Dave

fonik · Posted: Thu Jul 08, 2010 11:02 pm Post subject:

sounds good to me. are you using an LM324 for the buffers?

fonik · Posted: Thu Jul 08, 2010 11:07 pm Post subject:

BTW great module you've built. and it is good to have the LEDs near the step switches and pots...

emdot_ambient · Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD

Skrog Productions · Posted: Fri Jul 09, 2010 9:43 am Post subject:

Skrog Productions · Posted: Sun Jul 11, 2010 12:37 pm Post subject:

Hi , here's an mp3 of some switch flicking and dial turning on the V.C.P.S-8.
Start off with all steps to 'on' then switch all to ADC then adjusting the offset & fine pattern cv control .
The pattern cv came from my mfos 16 step sequencer clocked at 1/8th the rate of the vcps incoming clock for some slow pattern changes , i speed it up and down towards the end with a vcf sweep.
All synced to my drum machine Smile

i can see more Epicyclus music coming from this great sequencer, heh.
still one more vcps to build Smile

.
Dave.

voltage controlled pattern sequencer.mp3

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voltage controlled pattern sequencer.mp3

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a100user · Joined: Oct 28, 2003 Posts: 158 Location: UK

Very nice Dave,

I'll have to get mine built Rolling Eyes

David

emdot_ambient · Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD

Nice one, Dave. I'm stoked about this sequencer...got 2 to build, but no enclosure to put them in.

I plan on controlling mine from one of the two M-185 sequencers I've got to build from ryktnk. The combo should be great. The M-185 is 8-steps but each step can be retriggered up to 8 times before moving to the next step. So it can act as a kind of song arranger, storing up to 8 pattern changes and/or CV transpositions over the course of its cycle.

janvanvolt · Joined: Nov 24, 2005 Posts: 285 Location: Mainz, Germany

@fonik: have some build issues, so i emailed you, just FYI.

janvanvolt · Joined: Nov 24, 2005 Posts: 285 Location: Mainz, Germany

Actually, i found the error.

The orientation of the Power connector is wrong:

See:

http://www.blacet.com/misc.html

The "thick" line should be on the opposite site. Good that i have resettable
fuses. Module is working now Smile

fonik · Posted: Tue Aug 03, 2010 11:21 pm Post subject:

glad you found out...
fortunately the labeling on the PCB and in the documentation is consistent, so it is just the orientation of the connector itself, that does not match the MOTM standard...

janvanvolt · Joined: Nov 24, 2005 Posts: 285 Location: Mainz, Germany

nearly done with the rats nest Smile

last question: how to wire the (and to where) >0V and >5v LEDs (lowest two ones on your design panel) ?

janvanvolt · Joined: Nov 24, 2005 Posts: 285 Location: Mainz, Germany

I am still stuck with something:

- LED1 and LED2 now connected correctly (as i may assume), then with 95% turn of clockwise of the Offset i get the >5V LED lit. I NEVER got the <0V LED on, tested function by reversing LED1/LED2, so LED is definitely okay.
- Calibration does not seem to work, i still get fluctuations on the LED and cannot select the last pattern with T1.

@fonik: got a bit of time for troubleshooting ? seems a minor one, but i'm not able to find it.

fonik · Posted: Wed Aug 04, 2010 11:02 pm Post subject:

hallo jan,

do you use latest building documentation (06.07.2010)?
last pattern would be 0000000I (gray code).
do you use external voltage to light the <0 LED?

janvanvolt · Joined: Nov 24, 2005 Posts: 285 Location: Mainz, Germany

i am using the latest build instructions including the calibration info, however still the same issue.
i connected LED1 and LED2 to those (>5V <0V), but i am not able to get the 0V one lit. what do you mean with "externally powered" ?

i tested the LED's and both _are_ working.

fonik · Posted: Thu Aug 05, 2010 2:36 pm Post subject:

the <0V LED does light when the CV is below 0V, this can only be hwen using control voltages that have negative excursions. you won't get negative voltages when turning the offset pots.

diablojoy · Posted: Mon Aug 23, 2010 6:08 am Post subject:

got my first VCPS running not quite finished completely but along with everything else it is getting there slowly
by the way fonik orsm seq this is so much more than expected
a short noodle to follow, well maybe not that short Laughing