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 
Live streaming at radio.electro-music.com

  host / artist show at your time
  mosc Chez Mosc - Twyndyllyngs Live
Please visit the chat
 Forum index » DIY Hardware and Software » Thomas Henry designs
MPS with Roland pad/trigger
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [4 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
dimebucker



Joined: May 02, 2014
Posts: 11
Location: dublin

PostPosted: Thu Jan 29, 2015 3:27 am    Post subject: MPS with Roland pad/trigger Reply with quote  Mark this post and the followings unread

Hi guys,
Is there any reason the MPS would not work with one of the Roland 'PD' series, for instance:

https://www.youtube.com/watch?v=iYkA-xSrPfg

Another thing I was thinking about is trigger velocity? Is that possible, or even desirable?
I presume you would need some sort of volume attenuating circuit, if thats too complex it would be nice if you could route velocity to filter cutoff Smile

any thoughts/ideas welcome!
Back to top
View user's profile Send private message
richardc64



Joined: Jun 01, 2006
Posts: 628
Location: NYC
Audio files: 26

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

Can't help with your pad problem, but the MPS (and Bass++ and UD-1) won't respond to velocity because the trigger input opamp is configured as a comparator: Its output is off/on. You'd need to rewire it as an amplifier. Copy the DS-7 structure or try the one I've been using. Although both are single-supply, thanks to the diode(s) on the output they'd work with a TLO74 or other opamp powered dual-supply. You might have to tinker with the R & C values.


basic_intf.jpg
 Description:
To get the MPS "Locked" feature, switch the opamp (+) input to a positive voltage.
 Filesize:  29.19 KB
 Viewed:  336 Time(s)

basic_intf.jpg



_________________
"I am endeavoring, ma'am, to create a mnemonic memory circuit... using stone
knives and bearskins." -- Spock to Edith Keeler
Back to top
View user's profile Send private message Visit poster's website
dimebucker



Joined: May 02, 2014
Posts: 11
Location: dublin

PostPosted: Mon Feb 02, 2015 7:19 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the reply, v. interesting.

So this modification would mean a separate input for the piezo/pad?

Ive attempted to implement your design onto the MPS schematic below (pink colour), I'm quite a novice in this regard but trying to learn as I go. Would this work or will the Lock/Triggered switch need to be different?



.


Mod MPS.png
 Description:
 Filesize:  51.03 KB
 Viewed:  253 Time(s)

Mod MPS.png


Back to top
View user's profile Send private message
richardc64



Joined: Jun 01, 2006
Posts: 628
Location: NYC
Audio files: 26

PostPosted: Mon Feb 02, 2015 8:33 am    Post subject: Reply with quote  Mark this post and the followings unread

Hmmm...in my circuit the Sensitivity control is only for the piezo. The opamp has enough gain that even a 1V external trigger amplitude produces a full +V at the opamp output.

I think a resistor of some value is needed on the -15V "Locked" terminal of S1. You can just leave the other terminal unconnected.

Nice color choice, btw.


mps_mod.gif
 Description:
 Filesize:  23.83 KB
 Viewed:  231 Time(s)

mps_mod.gif



_________________
"I am endeavoring, ma'am, to create a mnemonic memory circuit... using stone
knives and bearskins." -- Spock to Edith Keeler
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: Scott Stites
Page 1 of 1 [4 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 » Thomas Henry 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