electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links
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
Help on a capacitor substitution
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
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
rjd2



Joined: Sep 02, 2007
Posts: 236
Location: philly

PostPosted: Fri Dec 06, 2013 1:49 pm    Post subject: Help on a capacitor substitution
Subject description: can a .047uf bypass go up or down?
Reply with quote  Mark this post and the followings unread

hi all, hopefully a quick question.

restoring a Yamaha CS-40M. on the attached board, there are a bunch of .047uf poly caps that look like they function as bypass caps to the -15V rail, and are toast. i need to sub them out.

i've got a gang of caps laying around, but not enough .047uf(and ceramic, at that) to do the whole board. my question: can i go up or down on the value for this application, you think? and can i use ceramic? thanks for the help.


Yamaha CS-40M Service Manual 3 of 4 ( 11 x 17 - Single Sided )_Page_17.jpg
 Description:
 Filesize:  3.86 MB
 Viewed:  142 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Yamaha CS-40M Service Manual 3 of 4 ( 11 x 17 - Single Sided )_Page_17.jpg



Yamaha CS-40M Service Manual 3 of 4 ( 11 x 17 - Single Sided )_Page_16.jpg
 Description:
 Filesize:  1.92 MB
 Viewed:  172 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Yamaha CS-40M Service Manual 3 of 4 ( 11 x 17 - Single Sided )_Page_16.jpg


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



Joined: Aug 16, 2011
Posts: 147
Location: Here

PostPosted: Sun Dec 08, 2013 10:16 am    Post subject: Re: Help on a capacitor substitution
Subject description: can a .047uf bypass go up or down?
Reply with quote  Mark this post and the followings unread

rjd2 wrote:
hi all, hopefully a quick question.

restoring a Yamaha CS-40M. on the attached board, there are a bunch of .047uf poly caps that look like they function as bypass caps to the -15V rail, and are toast. i need to sub them out.

i've got a gang of caps laying around, but not enough .047uf(and ceramic, at that) to do the whole board. my question: can i go up or down on the value for this application, you think? and can i use ceramic? thanks for the help.


These capacitors hold the analog value from the demultiplexer ym617. You can read the explanation in pages 28-29 of the hardware manual:
here
It is interesting the lecture from page 1 to 29 though.

So, as I understand, the capacitors must be enough large to hold the voltage value during 5ms but enough small to charge a new value during only 80 μs for each 5ms without a noticeable delay.

I would go for new 0.047uF polyester capacitors.

_________________
electronic-sea.net
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
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
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


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