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 » Rob Hordijk DIY Designs
Benjolin troubleshooting (doing ...nothing at all..)
Post new topic   Reply to topic Moderators: Rob
Page 1 of 1 [8 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
okelk



Joined: May 08, 2014
Posts: 57
Location: Vienna

PostPosted: Sat Mar 07, 2015 8:35 am    Post subject: Benjolin troubleshooting (doing ...nothing at all..)
Subject description: where to start?
Reply with quote  Mark this post and the followings unread

so I build a benjolin yesterday.

It's doing nothing at all and so I don't know what to search for.

I already checked the power in the ic sockets, and all the chips are getting +/-9v to gnd.
If it would have some weard behavior, I I may have an Idea what to search for, but it's doing nothing at all! Sad

Any ideas where to start troubleshooting?
help would be very much apprechiated.
Back to top
View user's profile Send private message
elmegil



Joined: Mar 20, 2012
Posts: 1675
Location: Chicago
Audio files: 14

PostPosted: Sat Mar 07, 2015 8:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Always start with the power, but you seem to have recognized that. Have you checked the power with the chips inserted as well? It's not clear from what you've said. If you have one bad chip dragging the rails down, it'll kill the whole thing.

From there I would start with the oscillators. Do you get anything at T1/P1/T2/P2?
Back to top
View user's profile Send private message
okelk



Joined: May 08, 2014
Posts: 57
Location: Vienna

PostPosted: Sun Mar 08, 2015 8:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Now I checked it also with the chips inserted.
it was fine first, then suddenly went up to 12v on the positive rail. (the 7809 broke. I replaced it.)
Also I realized that the TL074 left from the ssm2164 (U1, I think ?) and the ssm2164 got quite warm. The TL074 also gets warm without the 2164 installed.

So I assume that for some reason ether the tl074 and maybe also the 2164 are sucking too much power on the possitive rail... Sad

...any Ideas where to start searching?
Back to top
View user's profile Send private message
elmegil



Joined: Mar 20, 2012
Posts: 1675
Location: Chicago
Audio files: 14

PostPosted: Sun Mar 08, 2015 10:21 am    Post subject: Reply with quote  Mark this post and the followings unread

With the power off, verify the connections match the schematic, and review the board carefully (possibly with a magnifying glass) in those areas to look for shorts.
Back to top
View user's profile Send private message
lunaire



Joined: Jan 23, 2009
Posts: 19
Location: Sao Paulo

PostPosted: Sat Mar 14, 2015 2:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Im trying to troubleshoot a benjolin from a friend and I cannot find any errors in his soldering, all points are conductive, but the sound just seems not be exactly correct and one of the 9v batteries always gets VERY hot. Any ideas why is it getting so warm? OR how can i compare the sound? Any demos of basic benjolin available? Cause I guess those eurorack/macumbista might just sound a little different?
Back to top
View user's profile Send private message
elmegil



Joined: Mar 20, 2012
Posts: 1675
Location: Chicago
Audio files: 14

PostPosted: Sat Mar 14, 2015 2:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

a 9V battery getting very hot means you're drawing a LOT of current.

I think you'd need to measure and compare various points in the circuit to see what was different, or whether there was a chip or other component that's also getting hot.
Back to top
View user's profile Send private message
soundworker



Joined: May 31, 2013
Posts: 11
Location: Germany

PostPosted: Sun Mar 15, 2015 4:34 am    Post subject: Reply with quote  Mark this post and the followings unread

If there was +12V / -9V on the power rail of Benjolin the 4021 may be killed. This CMOS IC run max at +-9V, but over it died.
Replace it an try it again; better take it away and test first output of both VCO (at output connector) then filter and at last insert 4021 to see rungler signal at IC6 pin 14.

Best
willi
KlangbauKöln
Back to top
View user's profile Send private message
L´Andratté



Joined: Sep 23, 2012
Posts: 75
Location: Hamburg, Germany
Audio files: 5

PostPosted: Sun Mar 15, 2015 12:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

sorry no time atm to think about your problem
but his could be part of the issue
http://www.milton.arachsys.com/nj71/forums.html?menu=2&submenu=2&subsubmenu=3
good luck
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: Rob
Page 1 of 1 [8 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 » Rob Hordijk DIY Designs
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