oozitron

Trigger Outs - 4ms

8 posts in this topic

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

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Posted (edited)

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 :-(

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

Andrew

pulse-stretch.png

Edited by oozitron

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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?

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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:

But first, did you already try your module with the 1ms triggers?  ;)

Best regards
Bruno

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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. 

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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 @TK. for that, he's the only one who can explain how and what is doable.

Best
Bruno

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5 hours ago, Antichambre said:

But first, did you already try your module with the 1ms triggers?  ;)

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

 

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

Best Regards, Thorsten.

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