Trigger Outs - 4ms

MIDIbox SEQ
1

I am building a tr-606 sound module that requires 4ms triggers, but of course I want to trigger it from my MIDIBox (V4) sequencer.

Is there some way to adjust the trigger length of the DOUT via configuration?

Or has anyone built a circuit to extend the triggers to 4ms (with CD4016 chips) that they could share?

thanks!
Andrew

2

I found a “pulse stretcher” circuit on the MFOS page, but I don’t know what res/cap values would be correct and I don’t have a scope :frowning:

Any suggestions on the value for those two components so a 4ms trigger would result?

Andrew

pulse-stretch.png.78f956203371ea17d395109912cc4f25.png
pulse-stretch.png.78f956203371ea17d395109912cc4f25.png285×134 1.18 KB

3

Why does it need to use a 4016?

I don’t know what to plug into that MFOS circuit, but it seems like a 555 in monostable mode will do the trick, no?

4

Or a 74HC123, anyway, I don’t know how, but I’m sure there’s a way to set the drum triggers out of the Seq V4 to 4ms instead of 1ms.
Maybe ask here:

< base_url >/topic/13137-midibox-seq-v4-release-feedback/?do=embed&embedComment=118712&embedDo=findComment

But first, did you already try your module with the 1ms triggers?  :wink:

Best regards
Bruno

5

The clock pulse can be varied in ms steps, but the triggers are either gate or 1ms. Does it work to use “gates” instead? Often a trigger input will react on the rising edge. If it’s the falling edge though, then a gate wouldn’t help.

I had a quick look through the code, but I couldn’t find an obvious solution. Clocks are different to triggers, as the timing is always consistent relative to the master tempo. 

6

Same!
It seems the DOUT triggers can be enabled in the hardware config file by " DOUT_1MS_TRIGGER" then the variable seq_hwcfg_dout_gate_1ms is set from this text command but I don’t find where this variable is used, so I can tell how this is used, even less how to change its length.
I think we have to call for that, he’s the only one who can explain how and what is doable.

Best
Bruno

7

5 hours ago, Antichambre said:

But first, did you already try your module with the 1ms triggers?  :wink:

A different length of trigger will probably affect the sound, since it’s an analog circuit. Still might be worth trying though…

 

8

Pulse widths up to 10 mS are now supported, could be nice if you could try it out:

< base_url >/topic/13137-midibox-seq-v4-release-feedback/?do=embed&embedComment=184843&embedDo=findComment

Best Regards, Thorsten.