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 » The Repair Shop
Sample & Hold not working
Post new topic   Reply to topic
Page 1 of 1 [1 Post]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
saint gillis



Joined: Apr 21, 2012
Posts: 60
Location: Brussels

PostPosted: Mon Dec 16, 2013 1:36 am    Post subject: Sample & Hold not working Reply with quote  Mark this post and the followings unread

Hi I ve got a S&H module in this old modular synth (http://electro-music.com/forum/topic-59771.html) that's not working properly,
The synth has been restored by SynthRestore, and an additional oscillator has been added, the red part :

Posted Image, might have been reduced in size. Click Image to view fullscreen.

There was already an oscillator, the 2 PNPs at the top left, and the inputs marked "??" looks like negative voltage applied to vary the speed... I tried to remove the red part, to bias properly the oscillator (the 2 PNPs) and I found some kind of negative triggers at several places in the schematic, marked in blue.
It still doesn't work properly, and my lack knowledge in matter of transistors etc preserve my from getting ideas to make this module work as it should..
Any help would be appreciated, thank you forum!
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic
Page 1 of 1 [1 Post]
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 » The Repair Shop
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