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 Forum index » DIY Hardware and Software » Developers' Corner
3x8 Step Gate/Trigger Sequencer
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Sun Sep 30, 2012 1:28 pm    Post subject: 3x8 Step Gate/Trigger Sequencer
Subject description: 4017 based sequencer, gate to trigger converter, 555 clock generator and electronic switch
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Hello !!

I'm building a step sequencer and want to share with those who are interested.
With the help of schematics found on the internet, I breadboarded a nice
working sequencer.
With a 555 clock generator, the cgs24 gate to trigger converter and the 4017 baby10 based sequencer.
I build a 3x8 step gate/trigger sequencer with electronic switch.
The pcb foil I made with the help of Sprint-Layout.
Didn't do the schematics, but I can show the pcb and front design.
Also I finished the aluminium front and working on the pcb.

Next update I hope it's finished !!

Chris.


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Last edited by KRS1972 on Mon Oct 01, 2012 11:30 am; edited 1 time in total
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roglok



Joined: Aug 28, 2010
Posts: 163
Location: uptown

PostPosted: Sun Sep 30, 2012 3:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

looks great! can you chain them?

edit: nevermind, it's just one 4017, so obviously you can't Very Happy - still very cool!
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Sun Sep 30, 2012 3:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Roglok !

The sequencer can be used as an:
3 x 8 steps (A-B-C)
1 x 16 and 1 x 8 steps (A+B and C)
1 x 24 steps (A+B+C)
The electronic switch does the work, sequencer is "yes" just the 4017.

Grt.
Chris


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roglok



Joined: Aug 28, 2010
Posts: 163
Location: uptown

PostPosted: Sun Sep 30, 2012 3:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
The electronic switch does the work, sequencer is "yes" just the 4017.


Hey, that sounds interesting. Would you mind to share some details how it works?
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Sun Sep 30, 2012 3:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here is the schematic of the switch.
The pcb i posted works fine !!

CV or gate output from sequencer goes in switch A, B and C
Puls out from sequencer goes in pulse input from switch.
Eveytime the switch get a pulse, it steps to the next input.

Grt,
Chris


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elmegil



Joined: Mar 20, 2012
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PostPosted: Sun Sep 30, 2012 6:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Is that switch (S1) labelled backwards? I would think reset on pin 7 would give you A+B+C and reset on pin 4 would give you A+B ??
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Mon Oct 01, 2012 11:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Elmegil, you are right, thanks !!
Here is a update of the schema and pcb

grt,
Chris


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tokyomatik



Joined: Jan 20, 2011
Posts: 123
Location: berlin
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PostPosted: Mon Oct 01, 2012 5:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

this is just a great gift to the community!! and it also already includes reset and manual step!!!! i believe shouldnt be so difficult to add, eventually Cool an optional(?) cv controll and voila! waiting for updates and really curious to etch a couple of these babies Razz
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JingleJoe



Joined: Nov 10, 2011
Posts: 878
Location: Lancashire, England
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PostPosted: Tue Oct 02, 2012 3:38 am    Post subject: Reply with quote  Mark this post and the followings unread

CV control of which aspect?
_________________
As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"


Green Dungeon Alchemist Laboratories
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tokyomatik



Joined: Jan 20, 2011
Posts: 123
Location: berlin
Audio files: 6

PostPosted: Tue Oct 02, 2012 9:33 am    Post subject: Reply with quote  Mark this post and the followings unread

mmm...well, i was meaning not only gate / trigger out but also cv out....am i wrong???
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elmegil



Joined: Mar 20, 2012
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Location: Chicago
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PostPosted: Tue Oct 02, 2012 9:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Looks to me like you could use the individual pulse outputs to drive a bank of CV pots, similar to Baby 10. It's not clear to me whether those are selectable for a specific bank (A/B/C) or would be the gate of an OR of the three banks, but either way that seems like it could be used that way.
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Tue Oct 02, 2012 12:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here I have a block diagram "how to use the electronic switch"

grt,
Chris


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elmegil



Joined: Mar 20, 2012
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PostPosted: Tue Oct 02, 2012 1:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm still not sure I see how that switch can work.

Is there some way that the pulse from the sequencer is only triggering after an entire bank is complete? i.e. we step through the 8 steps of Bank A and then pulse, 8 steps of Bank B and then Pulse, and then (if not reset thanks to the spdt switch) 8 steps of Bank C and then Pulse?

I would have expected the pulse to be happening on each step.....
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Tue Oct 02, 2012 2:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Elmegil, that is what it does !

Quote:
Is there some way that the pulse from the sequencer is only triggering after an entire bank is complete? i.e. we step through the 8 steps of Bank A and then pulse, 8 steps of Bank B and then Pulse, and then (if not reset thanks to the spdt switch) 8 steps of Bank C and then Pulse?


And if you stack all the pulse outputs of the sequencer into the trigger in from the electronic switch, it switches 8 times in a bank.

Grt,
Chris
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elmegil



Joined: Mar 20, 2012
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PostPosted: Tue Oct 02, 2012 2:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

So where does that pulse at the end come from? It's not a standard thing in the Baby 10.... ?
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david.tb303



Joined: Oct 05, 2012
Posts: 5
Location: barcelona

PostPosted: Fri Oct 05, 2012 1:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

hi, i'm new here but looking at the forum for quite some time and first of all i want to thank everyone for the work.

Now my question: someone can tell me what book are these images? appeared here and in another post but can not find the reference ...

thanks in advance


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tokyomatik



Joined: Jan 20, 2011
Posts: 123
Location: berlin
Audio files: 6

PostPosted: Mon Oct 08, 2012 7:53 am    Post subject: Reply with quote  Mark this post and the followings unread

do u plan to make this layouts available for download? production?
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david.tb303



Joined: Oct 05, 2012
Posts: 5
Location: barcelona

PostPosted: Tue Oct 09, 2012 4:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm interested in the book to study it and learn more about it
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Wed Oct 10, 2012 2:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

These pages I found on the internet, don't know the titel of the book.
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KRS1972



Joined: Sep 27, 2012
Posts: 38
Location: Amsterdam

PostPosted: Wed Oct 17, 2012 11:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello !!

Here is a short demo of the Gate Sequencer, it triggers a 909 Bass Drum Clone.
This is just a test run, it's not completely finished yet.

Grt.
Chris

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darematheson



Joined: Nov 28, 2012
Posts: 12
Location: Rhode Island, USA

PostPosted: Wed Nov 28, 2012 10:37 pm    Post subject: That book. Reply with quote  Mark this post and the followings unread

Nice work, KRS - looks good.
I'm building a similar project now - 3x8, chainable, clock dividers, etc. My chaining switch is based on the exact circuit you posted.

That book is called Sound Synthesis, from 1990.
It is the source of the original "Baby 10" sequencer schematic, as well. Great book, full of useful ideas, schematics, and layouts... also chock full of so many horrible, horrible schematic mistakes, you'll be punching yourself in the face a lot if you build from it. Still - quite useful. I got it for $2 on the internet.

Best,
DM


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darematheson



Joined: Nov 28, 2012
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Location: Rhode Island, USA

PostPosted: Wed Nov 28, 2012 10:45 pm    Post subject: end pulse Reply with quote  Mark this post and the followings unread

P.S. Elmegil --
In answer to your question, the 'pulse' coming into the switch 4017 is just the 'end out' of the sequencer... which can be tapped from pin 15 (reset) of the sequencer 4017. The 4017 in the switch circuit is a different IC than the 4017 driving the 8 sequencer steps.

So - every time the sequencer resets back to the first step, it pulses the switch to the next channel.
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david.tb303



Joined: Oct 05, 2012
Posts: 5
Location: barcelona

PostPosted: Sun Dec 16, 2012 9:11 am    Post subject: Re: That book. Reply with quote  Mark this post and the followings unread

darematheson wrote:
Nice work, KRS - looks good.
I'm building a similar project now - 3x8, chainable, clock dividers, etc. My chaining switch is based on the exact circuit you posted.

That book is called Sound Synthesis, from 1990.
It is the source of the original "Baby 10" sequencer schematic, as well. Great book, full of useful ideas, schematics, and layouts... also chock full of so many horrible, horrible schematic mistakes, you'll be punching yourself in the face a lot if you build from it. Still - quite useful. I got it for $2 on the internet.

Best,
DM


thank you very much for the info, i'm saving this for future buy!
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