Super Sequencer

Skrog Productions

Hi all

Since building the vari-sequencer , I have sorely missed having 2 identical mfos standard 16 step sequencers .

I have a standard 16 step I built in 2005 and it's soon time it was condensed Smile

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I have ordered another standard 16step set of pcbs from Ray a few days ago and I'm planning to build a dual sequencer on a spare 400mm by 250mm blank panel I have had set aside.

This thread will take a few weeks to get going, I'm at the planning / thinking stage at the moment Smile

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The new panel needs to contain......
2 x standard 16 step sequencers.
2 x simultaneous gate buses per sequencer.
2 x sequential switches.
2 x clock dividers.
2 x CV mixers (keyboard transpose).
lots of toggle switches & wiring Very Happy

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here is 2 planning diagrams of how the external clock & re-set"all" functions are connected & also the plan of how the Gate buses are connected inside.

And a first envisaged panel layout Smile

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Super Sequencer block diag clock & reset.jpg

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Super Sequencer block diag Gates.jpg

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Skrog MFoS Super sequencer Feb 2015 fixes v2.jpg

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Skrog Productions · Posted: Sun Feb 22, 2015 2:26 pm Post subject:

Hi

Been soldering again & tweeking the panel design a little.....

Got the 2 cv mixers built on vero board that will do the transpose sections, I added a switch to select normal cv or glide cv to be mixed with an external keyboard midi to cv converters cv output .

also got the sequential switches , divider for slowly clocking the seq switches , and some buffers for the 4 gate patterns available.

more pics soon.....

boards.jpg

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Skrog MFoS Super sequencer Feb 2015 fixes v2.jpg

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Skrog Productions · Posted: Mon Feb 23, 2015 1:06 pm Post subject:

Hullo

Now got the mfos sequencer pcb's all populated & wired , need to do final panel checks for spacing & text fowling before I get the sticker done , and order the toggle switches & pots etc.

Dave.

mfos boards populated.jpg

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Skrog Productions · Posted: Wed Feb 25, 2015 2:03 pm Post subject:

Hi

I'm sure this is now the final final panel layout.... in blue Smile

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Checked twice over for text fouling by fixing washers / socket nuts and all seems good , phew! Smile

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While over-analysing the connection and integration of the different bits of this sequencer, in my head , I fore saw a problem with my reset all arraingment Smile

..... the sequential switches & their respective clock dividers for sequencer 1 & 2 reset with a +12 volt momentary push ..... and the MFOS sequencers reset with a momentary ground , to save altering the panel I decided to order a DP toggle switch that has a momentary action on one flick direction only , so it resets the + and ground circuits , on different poles , at the same time .

Hope to get the sticker done over the next few days ..... then it's time for hours of press drilling in the shed , gonna need a wooly hat & hot coco for that Wink

Dave.

Skrog MFoS Super sequencer Feb 2015 fixes v2 Blue convert curves.jpg

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Skrog Productions · Posted: Wed Mar 04, 2015 12:01 pm Post subject:

Hi .

I have never ordered 100 switches before , the case looks like a selection tray , but they are not finest Belgian chocolates Very Happy

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I have been using these red panel mounted toggle switches for some time now , they are solidly built and can take quite a few thousand switching actions , ive never had one fail yet , I need 70 odd for the project and the price was lower for 100+ from Rapid UK.

Dave.

switchy.jpg

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Skrog Productions · Posted: Fri Mar 06, 2015 10:50 am Post subject:

Hi

Panel was drilled in the shed last night and the finished sticker is now on and all the crosshairs have been scalpled out ready for control hardware fixing.
Hope to get a good few hours of building over the weekend.

Dave.

drill template sticker.jpg

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finish sticker on.jpg

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wackelpeter · Posted: Fri Mar 06, 2015 11:53 am Post subject:

Looks really nice so far and i guess wiring will be a big time of fun... Razz

Skrog Productions · Posted: Fri Mar 06, 2015 12:53 pm Post subject:

Thanks

, for sure , i've just fitted 68 switches and my fingers are raw Very Happy

Dave.

Skrog Productions · Posted: Fri Mar 06, 2015 1:00 pm Post subject:

2 Hrs , 4 coffee's , and a Galaxy chocolate bar later, after last pic ....... Smile

round the back.jpg

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Skrog Productions · Posted: Sun Mar 08, 2015 12:15 pm Post subject:

Hi

L brackets , pots & rotary switches all fitted now & I have wired all the ground connections , Led buses , gate buses & push feeds and gate bus diodes , now ready for bolting on the boards and connecting up the switch & pot flyleads from the pcb's through the week Smile

led buses , grounds , + hookups.jpg

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AlanP · Posted: Sun Mar 08, 2015 9:22 pm Post subject:

WOW. Well. Who wants a Klee when you'll have that knocking around? Great stuff (hope you have a really good pair of wire strippers!)

Skrog Productions · Posted: Fri Mar 13, 2015 12:33 am Post subject:

Thanks Alan Smile

I have built a klee a while back and it is great , this one is slightly different cycling through 4 different gate patterns with sequential switches instead of the klee's shift register core.

Dave Smile

Skrog Productions · Posted: Fri Mar 13, 2015 12:40 am Post subject:

Wiring, wiring and some more wiring......

Got the 2 main sequencers purchased pcbs running , did the usual no chip power test and fully chipped test , apart from a dud LED they are working with no problems.

Next job , connect up the add on circuits , clock dividers / sequential switches / cv transpose mixers and 2 extra gate / trigger buffer circuits for outputs "B" and "D".

If there are no build faults on the veroboard circuits.... I should have this operational by the end of the weekend , hopefully Smile

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wiring stage.jpg

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Skrog Productions · Posted: Sun Mar 15, 2015 6:01 am Post subject:

Skrog Productions · Posted: Sun Mar 15, 2015 6:03 am Post subject:

The Front End ..........

MFOS skrog super sequencer.jpg

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MFOS skrog super sequencer-.jpg

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Skrog Productions · Posted: Sun Mar 15, 2015 8:47 am Post subject:

Been having a good play with this in the modular now Smile

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To demo the first sequencer ( both have identical features) I have patched up the RM1X to the seq 1 external clock in , set up an 8 step sequence , plugged a midi keyboard note cv into the key cv input , connected a vco to each of the transpose mixed cv outputs.
2 vco's / vcf / vca with ADSR on the demo , the seq gate out is patched to the ADSR feeding 1 pattern at a time of up to 4 gate buses to work the vca .

through the demo I am pressing a key on the midi keyboard every so often which is transposing / changing the root note of the main sequence.

Dave.

super sequencer test 1-01.mp3

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MFOS skrog super sequencer test demo 1 patch up diagram.jpg

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sonic · Joined: Dec 02, 2010 Posts: 106 Location: Victoria BC

Looks amazing. You clever bugger. Love the 'Night Rider Theme' style tune too Wink

Skrog Productions · Posted: Sun Mar 15, 2015 11:21 am Post subject:

Thanks sonic Smile

Skrog Productions · Posted: Sun Mar 15, 2015 11:27 am Post subject:

2nd demo ......
This time I have 2 sequencers running 2 vco's / vcf / vca each and I have set the sequential switch mode to A B on seq 1 and C D on seq 2 , yellow drums (cynare's + MPS's doing percussive sounds) , no cv transpose on this one .
Sequencer 1 is set to an 8 step pattern and sequencer 2 is set to a 7 step pattern.
Also added some juno pad sounds over the sequences.

Dave.

super sequencer test 2-01.mp3

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phobos · Posted: Sun Mar 15, 2015 1:02 pm Post subject:

looks great dave and you finished it sooner than I expected Very Happy

Skrog Productions · Posted: Fri Mar 20, 2015 7:10 am Post subject:

Thanks Phobos , I think this one built quick because I for once planned it out in advance , heheheh Smile