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trigger inputs?
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creekree



Joined: Mar 30, 2006
Posts: 192
Location: Morgenland Neukölln
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PostPosted: Fri Aug 03, 2007 3:10 pm    Post subject: trigger inputs? Reply with quote  Mark this post and the followings unread

hello all,

i am looking for a way to add trigger inputs to my boss dr110 - i'd rather use it as a sound module than with its internal sequencer.
the trigger input points are fairly easy to identify if one has the service manual - they're all on the 18 pin ribbon cable that connects the analog and the digital boards.

now, the trigger lines are normally held at high 6v and go low to 0v for one millisecond, that is the trigger pulse.
does someone have a schematic for a conversion circuit that will enable me to feed "regular" trigger pulses (+5v) into that?
i am pretty sure its just a matter of one transistor and maybe a handful of resistors and caps, but i cant recall having seen something like that before.
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Sebo



Joined: Apr 27, 2007
Posts: 564
Location: Argentina

PostPosted: Fri Aug 03, 2007 3:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi
I will do the same (when I find the time) to my DR-110. I think that
normal 5V pulses will trigger it without problem.

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creekree



Joined: Mar 30, 2006
Posts: 192
Location: Morgenland Neukölln
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PostPosted: Fri Aug 03, 2007 6:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sebo wrote:
I think that
normal 5V pulses will trigger it without problem.


actually i dont think that is correct.
i can trigger the sounds by touching the trigger points with a wire that i hooked up to GND.
likewise, the trigger pulses coming from the cpu (the sequencer) need to be converted so they work as a "common" trigger out with +5v.
i know how to do that (actually, the accent trigger out has circuitry for that thatone just has to copy, but i am interested in trigger ins.

any ideas?
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Randaleem



Joined: May 17, 2007
Posts: 456
Location: Northern CA, USA

PostPosted: Fri Aug 03, 2007 7:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi,

What you're describing sounds like the old Moog Modular "S" (Switch) triggers.

If so, you can use any of the numerous internet-posted schematics for a moog S-trig converter. One place I'd look first is the http://www.synthesizers.com website. If Roger doesn't already have a schematic posted there; he'll surely be able to point you to one!

These are VERY simple circuits.

EDIT: Found it. Try here: http://www.synthesizers.com/resources.html click on the DIY V-Trig to S-Trig cable/circuit link.

Randal

creekree wrote:
Sebo wrote:
I think that
normal 5V pulses will trigger it without problem.


actually i dont think that is correct.
i can trigger the sounds by touching the trigger points with a wire that i hooked up to GND.
likewise, the trigger pulses coming from the cpu (the sequencer) need to be converted so they work as a "common" trigger out with +5v.
i know how to do that (actually, the accent trigger out has circuitry for that thatone just has to copy, but i am interested in trigger ins.

any ideas?
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creekree



Joined: Mar 30, 2006
Posts: 192
Location: Morgenland Neukölln
Audio files: 1

PostPosted: Fri Aug 03, 2007 8:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

randal,

that seems to do the trick. i'll try it tomorrow.
thanks for pointing me in the right direction!
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creekree



Joined: Mar 30, 2006
Posts: 192
Location: Morgenland Neukölln
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PostPosted: Fri Aug 03, 2007 9:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

oh, just for the sake of completenes:

this is the schematic for the opposite thing: s-trig to v-trig.
i found it in the files section of the tr707 yahoo group.



EDIT: i deleted the ascii art of the schematic. the forum software kept reformating it, rendering it useless. hm. if you need it, join the 707 yahoo group. on the other hand i am sure it is floating around the net anyway.
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Pehr



Joined: Aug 14, 2005
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PostPosted: Fri Aug 03, 2007 9:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

creekree wrote:
EDIT: i deleted the ascii art of the schematic. the forum software kept reformating it, rendering it useless. hm. if you need it, join the 707 yahoo group. on the other hand i am sure it is floating around the net anyway.


You could use
Code:
code
to write ascii schematics. Did you try that?
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creekree



Joined: Mar 30, 2006
Posts: 192
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PostPosted: Fri Aug 03, 2007 10:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

no, of course i didnt.
ok, another try then... just so no one can say i would give up too early Wink

Code:
There was someone asking about a circuit to generate voltage triggers from
an S-trigger out.  Well, here's the ASCII version of the circuit that
appeared in the March 1982 Keyboard  (Kraftwerk on the cover!)  Note that
this is for a 0/9v v-trigger.  If you need 15 volts, I'm sure it's a simple
change.


This will produce a voltage
trigger in response to an
s-trigger out.  The trigger                 Off
voltage will be 0 or 9 volts.            ___o       ___________
Close the switch to use, open           /          | 9-volt    |
it to save the battery life.     |-----o    o---- +| battery   |-- ground
                 ________________|          On     |___________|
                 \               \
                 /               /
             10k \           10k \
                 /               /
                 |               |----------------------- to tip of jack
                 |               |                        sleeve to ground
                 |    100k       /
      ___________|___/\/\/\___|/
      |                       |\   2N3904 or equivalent
1   -|-  S-trigger              \
    _____     in                 |
2    |                          |
      |                         ---
      |                  ground  -
     ---  ground
      -



success! Laughing
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andrewF



Joined: Dec 29, 2006
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Location: australia
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PostPosted: Sat Aug 04, 2007 9:46 am    Post subject: Re: trigger inputs? Reply with quote  Mark this post and the followings unread

creekree wrote:


now, the trigger lines are normally held at high 6v and go low to 0v for one millisecond, that is the trigger pulse.
does someone have a schematic for a conversion circuit that will enable me to feed "regular" trigger pulses (+5v) into that?
i am pretty sure its just a matter of one transistor and maybe a handful of resistors and caps, but i cant recall having seen something like that before.


i think you can get away with a npn transistor and (say) a 10k resistor for each input. attach the 10k to base, emitter to ground and collector to the input pin on the analogue pcb - (say pins 9,10,11,12,13)
input your +5v trigger to the 10k - voila....maybe Surprised
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Sebo



Joined: Apr 27, 2007
Posts: 564
Location: Argentina

PostPosted: Sat Aug 04, 2007 12:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sorry about my last post.
creekree, you right about that DR-110 uses active low triggers.
The transistor thing should work.
Another option is to use a CMOS inverter like 74HCT04 or something
like that with 8 inverters.
But remember you will loose the clap Sad

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creekree



Joined: Mar 30, 2006
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PostPosted: Sat Aug 04, 2007 1:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sebo wrote:

Another option is to use a CMOS inverter like 74HCT04 or something
like that with 8 inverters.
But remember you will loose the clap Sad


hey, thats a good idea. much lower parts count than using 5x 2n3904.
yes, i am concerned about the clap myself.
is there a simple burst generator? i know ken stone has one, but his is much too sophisticated for this application. also it wont run on the 9v max that i can tap from the dr110.
the burst gen has to emit 3 trigger signals 10ms each.
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creekree



Joined: Mar 30, 2006
Posts: 192
Location: Morgenland Neukölln
Audio files: 1

PostPosted: Sat Aug 04, 2007 2:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

oh, sebo:

i just realized youre from argentina. whereabout there?
i used to live in buenos aires for some months - these were among the best times i ever had!
the one bad thing that happened was the tragedy when this boliche in once burned down. clubs stayed closed for the rest of my stay (and even longer, i've been told).

message to the world: dont use fireworks inside a club. it wont go well with all the flamable material in there...

anyway, boludo: saludos a los porteños... y las chicas ricas. hmmmmm... Smile

yes, mi castellano es una mierda.
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Sebo



Joined: Apr 27, 2007
Posts: 564
Location: Argentina

PostPosted: Mon Aug 06, 2007 7:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, after that most clubs, discos & concert hall went closed (among other
public places like teathers, etc), and took about a year to some re-open
or new ones show up. But even now there are a lot less clubs that before
that. A shame.
About the clap:
You need 4 pulses, 3 for the clap an a fourth for the noise (reverb) part.
I made a MIDI to trigger with a PIC16F84A, and worked well.
It need some work, I didn't do the multi trigger for the clap yet. But I'm
busy with my job and other projects, so I don't know when I'm going to finish it. Hope soon.

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