mfos 16 step quantized vary-step-length sequencer

Skrog Productions

Hi all, ive been designing a panel in corel draw for a blue version of Ray's hot rod modification to the 16 step sequencer (Pontiac 455 super charged) heh Very Happy

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When i order the pcbs & wire everything up , i'll make the final adjustments to the spacings.

Really looking forward to building this one Smile

.

Dave

new MFOS sequencer V2 blue.jpg

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first draught mfos 16 step sequencer panel design ..... in blue.

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ashleym · Joined: Aug 20, 2009 Posts: 181 Location: uk

As ever a great looking panel and I am sure it will make your music that much more........ Twisted Evil

If I could offer an idea or two? On my sequencer I have added a selectable voltage for the CV output. If I want full control of, say, filter cut off I can use the high voltage, CV of pitch- medium voltage range something like 0-5v etc. I know you can use an attenuator, I just prefer switchable ranges.

Secondly I have taken an alternative gate/trigger out. If I switch a step "off" I just route it to another set of outputs. Waste no want not.

Skrog Productions · Posted: Thu Jul 05, 2012 1:23 pm Post subject:

thanks Ashleym , i think this will take most of the autumn to build , i've still an idea or 2 for that blank space on the right , cool idea for a 2 way switch routing the gate .

Dave

ashleym · Joined: Aug 20, 2009 Posts: 181 Location: uk

Dave- the least I could do. I used double pole switches and ran the second output off the second pole.

Ray also does a board for something similar with the 16 Step Sequencer Auxiliary GATE/LED Driver PCB that he's made for the variable step seq you are building.

diablojoy · Posted: Thu Jul 05, 2012 8:36 pm Post subject:

nice panel Smile

I like how you have saved some width with the offset vertical spacing
one of rays quantizers in that
space to the lower right might be nice.

Skrog Productions · Posted: Mon Jul 09, 2012 10:54 am Post subject:

Thanks Diablojoy , i have 2 of Rays quantisers im thinking of re-housing soon Smile

heh.

Dave

Skrog Productions · Posted: Wed Aug 15, 2012 9:56 am Post subject:

Hullo

i've now removed one of my mfos sequencers from my modular case & temporary hooked up the wiring from the new vari pcb .

i decided to test the "difficult" sequencer first , Version 1 mfos pcb from 2005 with several "Kludges" on it for external start/stop , clock in / out etc.

Removed the soon to be redundant internal clock circuit from the ver. 1 sequencer pcb as per document .

On the new vari pcb i have soldered the binary display led's onto the pcb to help with set up ( i will chop them off when all finished) also hooked up the rest of the fly leads to the new switches and tied steps 2-to-16 vari connections to ground leaving me with just step number 1 , which i have soldered a test measurement 100K pot with a header plug & socket so i can unplug the pot to measure the resistances needed for my rotary switches ( see pic below).

I will test all the required resistances over the weekend for 12 volt supply & 12 vari step positions on the 12 way rotary switches.

I have made room on the front panel for a second gate buss which i'll need to knock together a simple clone of the sequencer gate / trig circuit on vero board.

all going well so far , id recommend building as per plan first , then mod it after it's working Very Happy

Dave.

Seq V2 wires n chips.JPG

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step 1 pot with plug for testing resistance.JPG

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pot with plug & socket for easy disconnect to test resistance at step amount change

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Skrog Productions · Posted: Wed Aug 15, 2012 10:00 am Post subject:

updated panel design for new 2nd gate & mfos quantizer in corner Smile

Dave.

new MFOS sequencer V2 blue & quantizer AUG 2012 latest.jpg

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Skrog Productions · Posted: Tue Aug 21, 2012 11:36 am Post subject:

Hi there.

i've been working on the sequencer again Smile

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having temp hooked up the step 1 length pot, i first calibrated the pot action with the on pcb trimmer as Ray describes in the docs, then i turned the pot back to ground or 1 length position and measured the resistance at each change (solid lit led's) .

My pot is a 100K (measured - 102K ) .
At the last or 12th switch pole , my totalled resistance was 90K , i need a 12K resistor between the last position & +12V to make up the rest of the test pot travel.

So here are my results , yours will entirely depend on how you set your trimmer up to begin with.

Diagram of the 12 pole switch laid out flat with resistors between poles & a pic of the 12 way switch ( 1 of 16) to make , the heatshrink covers the 12K res.

more in a week or so , thanks for looking in Smile

.

Dave

rotary switch resistor values for mfos sequencer V2.JPG

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rotary switch with resistors.JPG

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ashleym · Joined: Aug 20, 2009 Posts: 181 Location: uk

16 of those will be fun to solder up Exclamation

Skrog Productions · Posted: Wed Aug 29, 2012 2:20 pm Post subject:

Skrog Productions · Posted: Wed Aug 29, 2012 2:31 pm Post subject:

Hullo.

Got the sticker on the panel now and have started to swap the pots & sockets over from the original sequencer to the V2 new one.

Two or three holes still need a bit of a file out to straighten (i snapped a 6mm drill bit half way through piloting with the bench pillar drill , i thought it was getting a bit wobbly Smile

).

This will take a few nights to fill up the panel......

Dave.

MFOS 16 step vari-sequencer hardware.JPG

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-minus- · Joined: Oct 26, 2008 Posts: 787 Audio files: 13

Dave, are you drilling then stickering.... or stickering then drilling? I'm looking to get some stickers done at the local sign shop and wondering what the best method is.

thanks!

Skrog Productions · Posted: Wed Aug 29, 2012 11:12 pm Post subject:

Hi Minus.

Both Smile

, i got a cheap black & white print for drill template , peeled that off then applied the "toner hungry blue" one lined up over the holes.

To move the sticker around easily, put a small amount of washing up liquid into a sink of water and swish to make soapy bubbles , dab the bubbles, with a sponge, onto the adhesive side of the vinyl to de-activate the stickyness .

Leave to dry for a day or so , any defiant airpockets can be lanced with a scalpel blade. After 3 days of evaporation, the sticker is going nowhere.

Good luck

Dave.

-minus- · Joined: Oct 26, 2008 Posts: 787 Audio files: 13

Hang on Dave Confused

.... Let me get this right... You are drilling the holes using a separate print out, then stickering the toner hungry blue version? Does this mean you are cutting the blue sticker, around the pre-drilled holes with a scalpel or something?

I was going to paper print a drill template and tape or glue stick it to the aluminium panel, drill, then sticker and cut around the holes. I was worried the drill bit might rip the vinyl sticker material. I have used plotter cut vinyl lettering with signs in the past. I used an atomiser spray bottle to soak the sticky side... then move it around... and squeegee in place.

I have found a local sign shop to do the stickers at a reasonable price Smile

.

Oh, one other thing... You are not wrapping your sticker around the edges of your panels are you? I was wondering if the corners might lift over time.

Thanks for your help!

Skrog Productions · Posted: Thu Aug 30, 2012 5:55 am Post subject:

delayed · Joined: Jun 24, 2008 Posts: 130 Location: TN

Looking nice

Skrog Productions · Posted: Sun Oct 14, 2012 5:43 am Post subject:

Thanks , this is taking a bit of planning & time , all worth it in the end Smile

Skrog Productions · Posted: Sun Oct 14, 2012 6:00 am Post subject:

Hi there , still working on this , deciding not to rush it since it's a bit more complicated with my old V1 (2005) seq boards with the mods to upgrade to V2(2008/9).

Here's a quick pic of the back of the panel , progress so far Smile

, i had to listen to some early Erasure albums to keep a happy vibe love

when soldering those 16 rotary sw's & resistors (the thought of it after work Sad

)

On the home straight now, wiring & some toggles to fit.

Dave.

SEQ back Oct 2012.JPG

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ashleym · Joined: Aug 20, 2009 Posts: 181 Location: uk

Keep the faith. You will finish. You will finish........

My building has stopped since I have made a little more commitment to making music, so I am jealous that you manage to do both Evil or Very Mad

dancelwerk · Posted: Tue Oct 16, 2012 7:40 am Post subject:

Hi to all i want to know if i can use a normal electrolitic capacitor for the variclock sequencer instead of one tantalum capacitor of the project, i cant get polarized tantalum capacitors here where i live.

thanks in advance.

Skrog Productions · Posted: Tue Oct 16, 2012 11:47 am Post subject:

Hi , i would think an electrolytic would be ok but im not sure , someone will know Smile

Skrog Productions · Posted: Tue Oct 16, 2012 11:55 am Post subject:

Almost there now , wired up , quick test and found some pots working back to front , heh , those to sort & tidy the cables up with some ties , i'll give it a good test at the weekend when i screw it back into the modular (there has been a draughty space in the modular for 3 months Very Happy

)

A pic of the back end and a couple of the front , i'm taking a wee rest from synth wiring for a few weeks after it's all working Smile

Dave.

SEQ v2 back.JPG

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SEQ v2.JPG

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ashleym · Joined: Aug 20, 2009 Posts: 181 Location: uk

Nice. Nice. Nice

Quite a dense panel but it all looks like it works well.

Any news on how the quantiser works? I found this, I know it's too late, and it looks interesting and so does his other stuff

http://www.bartonmusicalcircuits.com/cvquant/index.html

diablojoy · Posted: Wed Oct 17, 2012 9:22 pm Post subject:

Hi Dave
build is looking good
quick question
what is the overall size of your panel ?
I have 2 to do on my list and with a feature set exactly the same as your build so your panel layout looks like a good point to work from.