Highly Liquid Forum facebook twitter google plus rss feed
  #1  
Old 04-17-2012, 05:55 PM
Archangel Archangel is offline
Junior Member
 
Join Date: Apr 2012
Posts: 10
Default MSA to Blackstar DB-9 amp switcher

John,
This is an awesome board!

I am switching amp channels with pulsed cc#s
and boost & reverb with latched cc#s

programming was a snap with squerl on the mac


heres a ratty cellphone video clip
http://www.youtube.com/watch?v=OFZId...ature=youtu.be
Reply With Quote
  #2  
Old 04-18-2012, 02:37 AM
Archangel Archangel is offline
Junior Member
 
Join Date: Apr 2012
Posts: 10
Default

heres a clip with much better audio quality

and an Ipad synth thrown in the looper.

http://youtu.be/eZVHQpDPYro
Reply With Quote
  #3  
Old 04-19-2012, 04:50 PM
Archangel Archangel is offline
Junior Member
 
Join Date: Apr 2012
Posts: 10
Default

riddle me this:

how can I trigger the photorelays with external signals?
high or low? and perhaps the voltage on which pin of the msa-p's
photorelays

I want to switch with midi and external switch contacts.
and still protect the chip's outputs.
Reply With Quote
  #4  
Old 04-19-2012, 09:19 PM
John's Avatar
John John is offline
Moderator
 
Join Date: Jan 2009
Posts: 2,748
Default

Quote:
Originally Posted by Archangel View Post
riddle me this:

how can I trigger the photorelays with external signals?
high or low? and perhaps the voltage on which pin of the msa-p's
photorelays

I want to switch with midi and external switch contacts.
and still protect the chip's outputs.
Hi Archangel, welcome, and thank you for posting the videos.

The MSA controls the photorelays with a positive-logic signal (5V = closed, 0V = open). There is a series resistor between the microcontroller and the relay signal pin. Here is the datasheet for the photorelay:

http://www.semicon.toshiba.co.jp/doc...eet_071001.pdf

Let me know if this helps.
Reply With Quote
  #5  
Old 04-19-2012, 11:26 PM
Archangel Archangel is offline
Junior Member
 
Join Date: Apr 2012
Posts: 10
Default

Thanks John!

in checking to see if I asked the question properly,
I answered part of the question ..

...what is the trigger to the led of the opto
and is it protected with a resistor?

and you answered both perfectly.
and the datasheet is a great help.
Reply With Quote
  #6  
Old 04-19-2012, 11:36 PM
Archangel Archangel is offline
Junior Member
 
Join Date: Apr 2012
Posts: 10
Default

...is pin 1 (with the dot up top)
top left like my other chips?

The datasheet strangely dosent show the mark
Reply With Quote
  #7  
Old 04-20-2012, 01:12 AM
Jim McDougall Jim McDougall is offline
Moderator
 
Join Date: Aug 2009
Posts: 395
Default

If you look at the drawings the pin1 side has a shallow side slope compared to the pin 4 side which has a sharp side slope
Reply With Quote
  #8  
Old 04-20-2012, 01:53 AM
Archangel Archangel is offline
Junior Member
 
Join Date: Apr 2012
Posts: 10
Default

Thanks for that!

I believe I will be able to send the boards regulated 5v and ground out a cat5 cable to foot switches

and have 6 conductors to send back 5v signals to the optos
and the foot switches second contacts turn on leds
(except 3 leds would be pulsed in this application)

and have both midi and analog control over the opto outs
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 07:01 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.