electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
Live streaming at radio.electro-music.com

  host / artist show at your time
  Jez Adventures in Sound
Please visit the chat
 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
CMOS Keyboard and Sequencer
Post new topic   Reply to topic Moderators: mosc
Page 1 of 1 [2 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
jcintheus



Joined: Oct 16, 2011
Posts: 58
Location: Colorado

PostPosted: Fri Nov 01, 2013 3:59 pm    Post subject: CMOS Keyboard and Sequencer Reply with quote  Mark this post and the followings unread

I finally got around to overhauling my CMOS keyboard.
http://electro-music.com/forum/topic-54141.html
While testing the sequencer I came up with this:


Here's a circuit description:
This circuit uses a 4067 as a 16 step sequencer. The ABCD inputs are controlled by a 4029 up/down, binary/BCD counter.
The up/down, and the Binary/BCD pins are controlled by a slow shift register(4015), this varies the ABCD count and randomifies the pitches, in terms of sequence.
The 4015 also controls the ABCD inputs of a 4089. The resulting pulses are then fed into the clock input of the 4029. This randomizes the rhythm of the sequence.
The filter-like sounds are created by a 4046 set up as a pitch tracker and modulated by another shift register(74HC273) and some resistors.
At the 2:00 mark you'll hear a 4017/4051 melody generator,
it's ABC inputs fed by the 4029 and the 4015. Also I added a bit of delay.


DSC00137.JPG
 Description:
 Filesize:  1.21 MB
 Viewed:  98 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

DSC00137.JPG


Back to top
View user's profile Send private message
JingleJoe



Joined: Nov 10, 2011
Posts: 878
Location: Lancashire, England
Audio files: 14

PostPosted: Sat Nov 02, 2013 9:48 am    Post subject: Re: CMOS Keyboard and Sequencer Reply with quote  Mark this post and the followings unread

thats incredible Very Happy
_________________
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
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: mosc
Page 1 of 1 [2 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
e-m mkii

Please support our site. If you click through and buy from
our affiliate partners, we earn a small commission.


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use