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 » DIY Hardware and Software » YuSynth
CV GATE keyboard -- Keys contact de bouncing needed?
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [4 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
alanwilder81



Joined: Sep 03, 2016
Posts: 324
Location: italy

PostPosted: Sat Nov 03, 2018 2:48 pm    Post subject: CV GATE keyboard -- Keys contact de bouncing needed? Reply with quote  Mark this post and the followings unread

Dear folks,

I built the cv gate keyboard shown below, schemo found in the Yves's blog archive.
Although it does work (outputs CV and GATE as expected), i keep getting a note shift on key press, and most often on key release.
Almost always it's a sharp pitch drop.

In my setup im using momentary switches of varying quality.
The best ones minimize the pitch shift (often unnoticeable), but the bug is still there.
In the red square it's the RC filter debounce section, which cant seem to do much at all.
Is the rough switches contact bouncing the culprit, in first place (as i may assume) , causing a make-break make break contact, hence feeding the sample and hold a dirty signal?
And would the circuit benefit with further debouncing?

I've seen tons of methods. 555 debouncer, flip flop, schmitt trigger.
Just curious to hear your opinion about this .

cheers ! Wink


cv gate keyboard controller.png
 Description:
 Filesize:  45.41 KB
 Viewed:  181 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

cv gate keyboard controller.png


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



Joined: Nov 29, 2008
Posts: 560
Location: Berlin by n8
Audio files: 23

PostPosted: Sat Nov 03, 2018 3:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

ma che cazzo hai fatto Smile

You are back!
hope you are fine!
party time!

must be destiny, the first real house party tonight in this forgotten place - and you are returning the same evening!

i will go and see Daft Punk now,
see you tomorrow Smile

cheers,
gabi
Back to top
View user's profile Send private message
Grumble



Joined: Nov 23, 2015
Posts: 1033
Location: Netherlands
Audio files: 28

PostPosted: Sat Nov 03, 2018 4:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

increase the 6n8 cap.
_________________
my synth
Back to top
View user's profile Send private message Visit poster's website
gabbagabi



Joined: Nov 29, 2008
Posts: 560
Location: Berlin by n8
Audio files: 23

PostPosted: Mon Nov 05, 2018 7:56 am    Post subject: Reply with quote  Mark this post and the followings unread

well, what i would question are the two low-passes in serie

in the simulation they even start to swing a bit

i would try to decrease ( down to bridge them ) the resistor values


aw-lp.png
 Description:
 Filesize:  56.26 KB
 Viewed:  160 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

aw-lp.png


Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [4 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 » YuSynth
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