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 » YuSynth
ADSR Attack issue: - Solved!
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [14 Posts]		 View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
YashN



Joined: Jun 27, 2011
Posts: 104
Location: Canada
PostPosted: Wed Sep 02, 2020 10:20 pm    Post subject: ADSR Attack issue: - Solved!
Subject description: Attack too long even at Pot min position		 Reply with quote  Mark this post and the followings unread
My ADSR is misbehaving and the main issue I have is that even at Attack in the min position on the 1Meg Pot, the actual attack is way too long, so I cannot get a short attack at all.

Initially, I tested with a Sequencer sending Gate to it and thought it wasn't working at all.

However, on testing tonight with the Gate push button, I noticed that it was actually working to some degree and that's a relief, but the attack takes time to go to max amplitude. Hence I wasn't able to hear the ADSR working on a fast sequence when sending a Gate to the input.

I checked Release and that seems to be working well. You can see the min Release in the attached pic, and it the sound does linger on when I increase it. I am not so sure about Decay and Sustain working properly.

Any idea where I should start looking to troubleshoot the attack issue?

Power checked all right at +/- 12V.

ADSR.jpg
 Description:
Long Attack.
 Filesize:  53.5 KB
 Viewed:  360 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

ADSR.jpg

Last edited by YashN on Thu Sep 10, 2020 10:26 am; edited 1 time in total
Back to top
View user's profile Send private message
gabbagabi



Joined: Nov 29, 2008
Posts: 652
Location: Berlin by n8
Audio files: 23
PostPosted: Thu Sep 03, 2020 11:17 pm    Post subject: Reply with quote  Mark this post and the followings unread
could you post a link to the corresponding schematic?
Back to top
View user's profile Send private message
YashN



Joined: Jun 27, 2011
Posts: 104
Location: Canada
PostPosted: Fri Sep 04, 2020 3:04 pm    Post subject: Reply with quote  Mark this post and the followings unread
It's the Yusynth ADSR, the latest version.

Schematics
Back to top
View user's profile Send private message
Grumble



Joined: Nov 23, 2015
Posts: 1318
Location: Netherlands
Audio files: 30
PostPosted: Fri Sep 04, 2020 3:50 pm    Post subject: Reply with quote  Mark this post and the followings unread
Diode D3 connected in the right direction?
_________________
my synth
Back to top
View user's profile Send private message Visit poster's website
YashN



Joined: Jun 27, 2011
Posts: 104
Location: Canada
PostPosted: Fri Sep 04, 2020 9:46 pm    Post subject: Reply with quote  Mark this post and the followings unread
Grumble wrote:
Diode D3 connected in the right direction?


Hi Grumble. Yep, Diode D3 checked out all right, black stripe on top.

I chose the 'fast' ADSR configuration for mine. Jumper wires are set accordingly.
Back to top
View user's profile Send private message
Grumble



Joined: Nov 23, 2015
Posts: 1318
Location: Netherlands
Audio files: 30
PostPosted: Fri Sep 04, 2020 10:37 pm    Post subject: Reply with quote  Mark this post and the followings unread
Where did you measure the signal shown in your picture?
You should measure it at the output of U2a at pin 1, because if you measure it over the capacitor that is responsible for the rise and decay time of your adsr (C4a) you have a resistor of probably 1Mohm in parallel with this capacitor (the probe impedance)
_________________
my synth
Back to top
View user's profile Send private message Visit poster's website
YashN



Joined: Jun 27, 2011
Posts: 104
Location: Canada
PostPosted: Sat Sep 05, 2020 9:35 am    Post subject: Reply with quote  Mark this post and the followings unread
Grumble wrote:
Where did you measure the signal shown in your picture?


Simply at the Output.

Will make another one at the chip out as you recommended. Thanks.
Back to top
View user's profile Send private message
romaindegode



Joined: Feb 28, 2019
Posts: 26
Location: France.
PostPosted: Tue Sep 08, 2020 8:18 am    Post subject: Reply with quote  Mark this post and the followings unread
Did you put a CMOS 7555?
I had similar issues till I realized I used a simple N555
Back to top
View user's profile Send private message
kkissinger
Stream Operator


Joined: Mar 28, 2006
Posts: 1440
Location: Kansas City, Mo USA
Audio files: 45
PostPosted: Tue Sep 08, 2020 7:13 pm    Post subject: Reply with quote  Mark this post and the followings unread
Check for a solder bridge near D3. Also, does the attack vary with different settings of decay and release? Also, how does the position of fast vs slow work? Check the polarity on C4a.
_________________
-- Kevin
http://kevinkissinger.com
Back to top
View user's profile Send private message Visit poster's website
YashN



Joined: Jun 27, 2011
Posts: 104
Location: Canada
PostPosted: Wed Sep 09, 2020 5:26 pm    Post subject: Reply with quote  Mark this post and the followings unread
romaindegode wrote:
Did you put a CMOS 7555?
I had similar issues till I realized I used a simple N555


IIRC, it's a CMOS 555, from the set I ordered to build the Thomas Henry VCO-555 which requires one. Will double-check just in case.
Back to top
View user's profile Send private message
YashN



Joined: Jun 27, 2011
Posts: 104
Location: Canada
PostPosted: Wed Sep 09, 2020 5:27 pm    Post subject: Reply with quote  Mark this post and the followings unread
kkissinger wrote:
Check for a solder bridge near D3. Also, does the attack vary with different settings of decay and release? Also, how does the position of fast vs slow work? Check the polarity on C4a.


Very helpful pointers, @kkissinger, will check all these.

BTW, also saw your post on the VC-LFO2, very helpful too!

Thanks.
Back to top
View user's profile Send private message
YashN



Joined: Jun 27, 2011
Posts: 104
Location: Canada
PostPosted: Wed Sep 09, 2020 6:08 pm    Post subject: Take a guess... Reply with quote  Mark this post and the followings unread
Guess where I found this little guy lurking?

op.jpeg
 Description:
Op
 Filesize:  3.61 KB
 Viewed:  7323 Time(s)

op.jpeg
Back to top
View user's profile Send private message
romaindegode



Joined: Feb 28, 2019
Posts: 26
Location: France.
PostPosted: Thu Sep 10, 2020 5:47 am    Post subject: Reply with quote  Mark this post and the followings unread
Ah ah yeah if he was using 7555's chair, I guess all problems are gone now 😁
Back to top
View user's profile Send private message
YashN



Joined: Jun 27, 2011
Posts: 104
Location: Canada
PostPosted: Thu Sep 10, 2020 10:26 am    Post subject: Reply with quote  Mark this post and the followings unread
romaindegode wrote:
Ah ah yeah if he was using 7555's chair, I guess all problems are gone now 😁


All good now, Romain, thanks.

Who would have thought? Very Happy
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 [14 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


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