16 Step 4017 sequencer?

01012k7 · Joined: Aug 31, 2013 Posts: 25 Location: England

Ok made this about a week ago but with computer problems not been able to post it works ..
https://www.youtube.com/watch?v=QTSz1F7wuVM

tokyomatik · Posted: Tue Jun 02, 2015 9:23 pm Post subject:

01012k7 · Joined: Aug 31, 2013 Posts: 25 Location: England

That's the plan now switches and gate out.

completed version .

16 step.jpg

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Snaper · Joined: Feb 28, 2014 Posts: 217 Location: Hungary

Snaper · Joined: Feb 28, 2014 Posts: 217 Location: Hungary

Ok, so tried the AND version of the cascading from the 4017 datasheet, and the result is the same.
Can't set the number of steps :S

Snaper · Joined: Feb 28, 2014 Posts: 217 Location: Hungary

Another interesting thing, that if I try to supply it from +15V and Ground instead of +5V and ground the result is only one cycle, then it "freezes"...
I can restart it, if I remove then immediately place back the jumper for the LEDs :S

NuttyMonk · Joined: Jun 30, 2020 Posts: 63 Location: UK

Hi everyone,

has anyone managed to get a 16 step, cascading 4017 sequencer with selectable number of steps working yet?

I've got the cascading part working fine. Just followed the suggested schematic on the datasheet and paid attention to which of the output are "decoded". It's the number of step that i am having problems with as i see others have had in the past.

Any working approaches to this problem would be very well received.

Cheers

NM

PHOBoS · Posted: Tue Sep 29, 2020 3:46 pm Post subject:

As some others suggested in this thread it's far easier to just use a binary counter followed by a binary to decimal decoder.
The attached circuit diagram should be enough to get you started.

see also this thread.

basic 16-step counter.gif

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NuttyMonk · Joined: Jun 30, 2020 Posts: 63 Location: UK

Thanks for the quick reply Phobos. I was trying BCD counters and Mux's and then i went onto 4017's but this seems a lot easier to work with then the 4017's. I was hoping there was a 4017 with 16 stages but no such luck.
Will try out some schematic ideas with these two chips instead.

Cheers

NM

p.s. why the resistors to ground on the clock and reset pins? Is this to drain off some of the current going to those pins?

NuttyMonk · Joined: Jun 30, 2020 Posts: 63 Location: UK

p.s. has anyone ever tried putting a switch and inverter between the bit outs of the counter and the bit ins of the 4514? That should create some different and unusual sequences shouldn't it?

PHOBoS · Posted: Tue Sep 29, 2020 5:30 pm Post subject:

NuttyMonk · Joined: Jun 30, 2020 Posts: 63 Location: UK

dk · Joined: Feb 12, 2019 Posts: 115 Location: Europe

If you do go the 4017 route, the setup in the datasheet posted on the first page of this thread or the stuff PHOBoS posted that he linked to are the way to go... otherwise, I agree with PHOBoS on using a binary counter + binary to decimal decoder. Way simpler, and you often get cool additional features on the binary counter, like the ability to switch directions, preload (skip to any given step, either through a gate input or by pressing a button), etc.

OT, but since I gathered from the other thread you had posted that you like sequencers Wink

, you can replace the sequencer core with a shift register and get a VERY basic version of a Klee sequencer. Perhaps for a future project? Cool

blakeAlbion · Posted: Thu Apr 28, 2022 8:54 pm Post subject:

I built my first 4017 sequencer when I was 16 back in 1983. A year later I figured out it was terrible for generating musical pitches but great for generating patterns. A year later I figured out how to use the carry/enable to cascade 2 together to do a 16 step sequencer. With 4 banks of dual 8-switch DIP switches I had a 4-channel drum machine.
I'm looking at a junked Cort CRM-260 Drummer drum machine tonight and I can see the dead 16 pin IC is just a 4017.
I recall buying a MM5871 IC at Radio Shack. I am surprised you can 't buy something like this today. I know Barton makes a 4 channel rhythm chip but for maximum cheese you need enough channels to drive your Latin percussion section.

PHOBoS · Posted: Thu May 05, 2022 12:27 pm Post subject:

rlender90 · Joined: Jan 21, 2023 Posts: 3 Location: United States

First thread I'm reaching out in, I know it's an older one, but hoping someone can answer my question.

I'm building a 2x4017 16 step sequencer. I'm putting a 12-position rotary switch in, and was wondering, for the common pin to reset the sequence - does that go to pin 15 on both 4017s or just the first?

PHOBoS · Posted: Sun Jan 22, 2023 1:39 pm Post subject:

I don't know which design you are planning to use but with a single 12step rotary switch you will probably be limited to resetting
the second or first 4017 only. Not all is lost though, if you want 16 steps you could hardwire the first 4017 to 7 steps. Then reset
the second one on steps 2/3/4/5/6/7/8/9/10. The stepcount is 1 lower than the step you use to reset so combined with the 7
steps from the first one that would give you the option to switch from 8~16 steps.

rlender90 · Joined: Jan 21, 2023 Posts: 3 Location: United States

PHOBoS · Posted: Wed Feb 08, 2023 12:33 pm Post subject:

blakeAlbion · Posted: Thu Mar 23, 2023 1:55 pm Post subject: Yuh, 1 4017 split by AND gates.

Back in the 80s we used 4 quad AND gate chips, controlled by a 4013 to switch at the start/end of each 8-beat bar.
The a bunch of diodes feeding the outputs into 4 pairs of mini-dips.

So we had a 4-voice 16 step drum machine, programmable by DIP switches.

http://benjamintremblay.com/retro/audio/Narrow_Decade.mp3

There's probably a better way to do this. These days I would use an Arduino Mega or just a bunch of multiplexers with a cheap Arduino-ish board.

The 4017 doesn't really offer you anything you wouldn't get from an Arduino. And if you use Arduino you could use someone's library, like fifteenstep, and hang some sync options off it.

A sequencer based on knobs seems really wonky to me. Very hard to keep in tune.