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 » Developers' Corner
Design delay/reverb multiple PT2399
Post new topic   Reply to topic Moderators: DrJustice
Page 1 of 1 [19 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Tue Jun 28, 2016 12:28 am    Post subject: Design delay/reverb multiple PT2399
Subject description: how to connect the signal path?
Reply with quote  Mark this post and the followings unread

Ok, so I'm designing/building a delay/reverb module with three PT2399
Here is a preview with a delay using one PT2399

My question:
If I place the three PT2399's in series (the output of the previous one is fed into input of the next one) do I have to feedback the output of each PT2399 to the input of the module, or to the input of the PT2399 where the output signal is coming from?
I can't imagine what the sound will be like if I do one or the other?
Back to top
View user's profile Send private message Visit poster's website
earo



Joined: Apr 19, 2011
Posts: 13
Location: haifa

PostPosted: Fri Jul 29, 2016 1:12 am    Post subject: Reply with quote  Mark this post and the followings unread

If you connect each output to the next input you'll get longer delays.
If you 'return' each output to the first input you'll get mono multi tap.
You can probably wire up a switch to give you both options and/or use separate tap outputs.
Back to top
View user's profile Send private message
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Tue Sep 13, 2016 11:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

http://www.youtube.com/watch?v=0QfSGQ9v3m0


I'm a bit further, this sound is made with all three PT2399's fed with the same sound, all three different delay times and the outputs tied together.
Now I'm building the mixers on this board.
When all is finished, I can set the feedback from all three channels to the mixer with the input signal, and the inputs can choose between the main input (mixed with the attenuated outputs of the three channels) and the previous channel (1st channel input to last channel)
The output will have a wet/dry mixer.
Back to top
View user's profile Send private message Visit poster's website
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Wed Sep 14, 2016 6:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Pff.... 5 Volt, 560 mA Shocked
Back to top
View user's profile Send private message Visit poster's website
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sun Oct 09, 2016 10:47 am    Post subject: Reply with quote  Mark this post and the followings unread

http://www.youtube.com/watch?v=YcEFz9QIfgA

First impression using three PT2399's in one module
Back to top
View user's profile Send private message Visit poster's website
ejr27233



Joined: Feb 08, 2010
Posts: 52
Location: UK

PostPosted: Mon Oct 10, 2016 12:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Love the youtube demo.
Does it really draw that much current?.?!!!
Are you planning to publish a schematic?
Back to top
View user's profile Send private message
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Mon Oct 10, 2016 1:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes, I plan to publish the diagram, but I made some last minute changes.
This module is powered by 5 volt and
i checked with a usb charge check device and drew 560mA. But it was unfinished and I will measure again.
Back to top
View user's profile Send private message Visit poster's website
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Tue Oct 11, 2016 4:38 am    Post subject: Reply with quote  Mark this post and the followings unread

The Diagram as I made it

Edit: There is also a small dc/dc converter module on the board for the -5volt to power the negative rail of the opamps on the right hand side.


Delay PT2399x3.JPG
 Description:
 Filesize:  201.58 KB
 Viewed:  3671 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

Delay PT2399x3.JPG



Last edited by Grumble on Tue Oct 11, 2016 7:04 am; edited 2 times in total
Back to top
View user's profile Send private message Visit poster's website
blue hell
Site Admin


Joined: Apr 03, 2004
Posts: 24079
Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320

PostPosted: Tue Oct 11, 2016 4:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice module!
_________________
Jan
also .. could someone please turn down the thermostat a bit.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Back to top
View user's profile Send private message Visit poster's website
Cfish



Joined: Feb 24, 2016
Posts: 477
Location: Indiana

PostPosted: Tue Oct 11, 2016 3:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Loved the YouTube video. You came a long way since the last video I caught.

My digital age teen boy thinks I am nuts playing with analog. He is an arduino fan, but just really getting in to it.

You are his new hero. He thought I was nuts when I kept telling him people use those to build synths.

Absolutely awesome Grumble. Thanks for sharing your schematic.
Back to top
View user's profile Send private message
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sun Oct 23, 2016 2:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

Playing with my delay/reverb module.
Have some modulation on the delay time.
It starts and ends with the dry signal. In between I play around with the various settings.


modulated_delay.wav
 Description:

Download
 Filename:  modulated_delay.wav
 Filesize:  31.85 MB
 Downloaded:  1304 Time(s)

Back to top
View user's profile Send private message Visit poster's website
Cfish



Joined: Feb 24, 2016
Posts: 477
Location: Indiana

PostPosted: Mon Oct 24, 2016 3:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sounds great grumble. Lot of versatility in sound.
Back to top
View user's profile Send private message
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Mon Oct 24, 2016 9:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you, Chris Very Happy
Back to top
View user's profile Send private message Visit poster's website
hakonbraga



Joined: Feb 02, 2018
Posts: 1
Location: spain

PostPosted: Fri Feb 02, 2018 9:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Sounds great!
I'm curious why you are using a Arduino to control the CV?
Could you not just skip that and send it straight into pin 6 on the PT2399, with maybe a little more resistance?
Back to top
View user's profile Send private message
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Fri Feb 02, 2018 2:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

I did it this way (using a digital potmeter) because in my knowledge the frequency is set by an impedance, not by a voltage.
_________________
my synth
Back to top
View user's profile Send private message Visit poster's website
AlanP



Joined: Mar 11, 2014
Posts: 746
Location: New Zealand
Audio files: 41

PostPosted: Fri Feb 02, 2018 11:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

To my understanding, the PT2399's time thing is current controlled.
Back to top
View user's profile Send private message
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sat Feb 03, 2018 12:31 am    Post subject: Reply with quote  Mark this post and the followings unread

Well, datasheets all have a (variable) resistor to gnd coming from pin 6 to set the internal frequency of the PT2399 and tables that shows resistor versus frequency, so I figured that maybe the resistor is part of an R/C networg and that is why I went for a programmable resistor. But by doing that, the benifit is that the delay time is very well controlable by a pot or CV.
While my initial assumption might be wrong, it still worked out beautifully Very Happy

_________________
my synth
Back to top
View user's profile Send private message Visit poster's website
gabbagabi



Joined: Nov 29, 2008
Posts: 651
Location: Berlin by n8
Audio files: 23

PostPosted: Sat Feb 03, 2018 12:39 am    Post subject: Reply with quote  Mark this post and the followings unread

somehow i totally missed out that thread sleeping

nice work dr. grumble!

what happend to the idea to dasychain the delays?
recently i saw a discussion about to chain them digitaly, which is a nice idea but not working cos u cant sync the internal osc of the pt2399.

cheers,
gabbagabi

edit: if not already known for a long time,something about delay-time-CV: http://www.sdiy.org/destrukto/vc-echo.html#pt2399
Back to top
View user's profile Send private message
Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Sat Feb 03, 2018 6:23 am    Post subject: Reply with quote  Mark this post and the followings unread

If you look at the schematics I showed earlier (THIS one), you see 3 PT2399's, the top one receives input via opamp U9B or from the third PT2399 which has the longest reverb time, the 2nd PT2399 receives input from U9B or the input is grounded, the 3rd PT2399 receives input from U9B or from the output of the 2nd PT2399.
This way I can have three PT2399's in series.
Input -> PT2399-2 -> PT2399-3 -> PT2399-1 -> and all three outputs mixed together to the output of the module. Besides that also 3 outputs are provided for each PT2399.
tho this setup working, it is not is not working to my fullest content, so in time it will need some revision...

_________________
my synth
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic Moderators: DrJustice
Page 1 of 1 [19 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 » Developers' Corner
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