[sdiy] How long should a Trigger pulse be?

Tom Wiltshire tom at electricdruid.net
Wed Dec 18 15:47:22 CET 2013

Here's the timing for that little circuit, BTW:


On 18 Dec 2013, at 14:38, Tom Wiltshire <tom at electricdruid.net> wrote:

> Hi All,
> I'd like the benefit of your combined experience, if I may.
> I'm decoding MIDI Note On/Offs and outputting Gate and Trigger pulses to drive envelopes. My own envelope designs don't need a very long trigger pulse in order to fire, but I thought perhaps some others do.
> Currently I'm using 500us Triggers, but I don't have a big pile of old synths here to try that on, so I don't know how well that will work on vintage gear.
> And then of course, there's the problem of envelopes or synths that don't have a Trigger input...
> I remember the Kenton Pro-2 MIDI-to-CV convertor had a "retrigger" mode where it dropped the Gate briefly to allow Gate-only envelopes or synths to retrigger. It didn't say how long it dropped the gate for though. I'd thought to do something similar with the following circuit:
> http://www.electricdruid.net/GateAndTriggerCircuit.png
> This converts Gate and Trigger into a Gate-with-gaps that will retrigger a Gate-only envelope. And this is the main reason for my asking the question; In this case, the output gate is essentially delayed by the length of the trigger pulse, hence my desire to keep it as short as possible. If it wasn't for that, I'd just use 5ms and reckon that'd trigger anything.
> So, oh wise ones of Synth DIY, how short can my trigger pulse be?
> Thanks,
> Tom
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