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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Building a squencer with clocked logic and ram?
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Musica_En_Fuego



Joined: Jun 19, 2018
Posts: 9
Location: New Castle, Delaware, USA

PostPosted: Thu Sep 13, 2018 1:15 pm    Post subject: Building a squencer with clocked logic and ram?
Subject description: using crystal oscillators, ram, logic ICs to make a sequencer that can record inputs and repeat them
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I've been reading the CMOS Cookbook for the past few days and just had a thought. How could I make a sequencer that can record inputs and with a flick of a switch, play it back infinitely? And maybe have the ability to modify the playback sequence and reset it back to the default sequence? I know some of ya'll maybe thinking, "just get a DAW for that!". But I want to do it at a hardware level.
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synaesthesia



Joined: May 27, 2014
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PostPosted: Thu Sep 13, 2018 1:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

My first though was to use a micro-controller, but I guess you meant discrete logic, so I am trying to follow your thought.
You could encode the sequence in binary instead of using multiplexed pots. Then use several shift registers in parallel for the data and manipulate the outputs.
Either switch between outputs, change the order before decoding, or even apply some logic to them.
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PHOBoS



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PostPosted: Fri Sep 14, 2018 3:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Do you want to store/play analog or digital sequences ?
If it's digital it is something I have thought about too after watching the excellent Building an 8-bit breadboard computer
series by Ben Eater on youtube. With some of the parts of it you could do it. A (none DIY) microprocessor would
make things a lot easier though, but where's the fun in that Laughing

I do like the shiftregister idea. it gets rather large if you want to store a lot but it should be a bit easier to control
than RAM. Downside is that you don't have much control over it and of course it can't hold sequences without power.

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piedwagtail



Joined: Apr 15, 2006
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PostPosted: Fri Sep 14, 2018 9:02 am    Post subject: Reply with quote  Mark this post and the followings unread

http://electro-music.com/forum/phpbb-files/eti_sequencer_759.pdf

File already here
There's at least three magazine projects, the Oberheim and SCI products...
Could do the link in a CPLD.

R
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Steveg



Joined: Apr 23, 2015
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PostPosted: Sat Sep 15, 2018 3:22 am    Post subject: Reply with quote  Mark this post and the followings unread

This might also have some ideas you can use: https://www.youtube.com/watch?v=_EJQO4cWgFM
Elliot is hexagon5un here on electro music.
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Musica_En_Fuego



Joined: Jun 19, 2018
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Location: New Castle, Delaware, USA

PostPosted: Sat Sep 15, 2018 4:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
Do you want to store/play analog or digital sequences ?
If it's digital it is something I have thought about too after watching the excellent Building an 8-bit breadboard computer
series by Ben Eater on youtube. With some of the parts of it you could do it. A (none DIY) microprocessor would
make things a lot easier though, but where's the fun in that Laughing

I do like the shiftregister idea. it gets rather large if you want to store a lot but it should be a bit easier to control
than RAM. Downside is that you don't have much control over it and of course it can't hold sequences without power.


Digital would be easier to deal with. Just making it would be quite a task. There is still so much i need to learn.

The ram idea still seems possible. Maybe a bistable cmos circuit could control the write enable and output enable functions. Check this datasheet: https://www.mouser.com/datasheet/2/464/IDT_7164SL_DST_20161205-881067.pdf
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