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 
 Forum index » Instruments and Equipment » Modular Synthesis
4520 Questions
Post new topic   Reply to topic
Page 1 of 1 [3 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
oram



Joined: Jan 04, 2016
Posts: 3
Location: New York

PostPosted: Mon Jan 04, 2016 10:18 pm    Post subject: 4520 Questions Reply with quote  Mark this post and the followings unread

Hi,

I'm new here. I recently posted an introduction.

I've built lot of guitar pedals and some amps, but I just started to get into this synth stuff, and have lots to learn.

I've been messing around with a breadboard and some 40106. I plan on experimenting with making a 40106 polyphonic keyboard. I was mostly reading about 4040 ICs but I just discovered the CD4520. Am I reading this correctly? Is it 2 separate dividers in one IC? If so, this would allow me to cut my divider IC count in half! As I only really need 3 or 4 octaves.

If so, and I just wanted to use this IC to simply divide 40106 oscillators, would I need to ground both Enable A/B and Reset A/B pins?

Also, I noticed that the 4040 IC does not have an Enable pin. What exactly does this do?

Thanks to all for the help!
Back to top
View user's profile Send private message
PHOBoS



Joined: Jan 14, 2010
Posts: 4454
Location: Moon Base
Audio files: 625

PostPosted: Tue Jan 05, 2016 9:49 am    Post subject: Re: 4520 Questions Reply with quote  Mark this post and the followings unread

welcome party!

yes, the 4520 has 2 dividers/counters in one package which can be used independently. Both reset pins
need to be connected to GND, both enable pins need to be tied to V+. The enable pin enables the CLK input
so if it is low the CLK signal is not passed through to the counter.

If you really want to make a polyphonic keyboard I would advice you to read this thread. (if you haven't already)

_________________
"My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider
Back to top
View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger
oram



Joined: Jan 04, 2016
Posts: 3
Location: New York

PostPosted: Wed Jan 06, 2016 7:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey thanks so much for the reply! I did see that link you posted. Some cool ideas there for sure.

I've been bread boarding A bunch of ideas for the keyboard and it's all working pretty nicely.

Im slightly concerned about the pitch stability of the oscillators. So I'm looking into what would be the best type of caps to use. Especially with temperature sensitivity.

Also, I can use basic push button momentary switches. But keyboard keys would be nice. Anyone know of some cheap keyboards I can gut that use momentary keys? I opened a cheap 90s keyboard and the PCB on the keys use some weird diode scheme I can't get my head around. Nothing fancy, I just need totally independent keys for full-on polyphony!
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic
Page 1 of 1 [3 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » Instruments and Equipment » Modular Synthesis
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