[sdiy] How long should a Trigger pulse be?

[Roman Sowa]

I'm using slightly less than 1ms in MIDI2CV devices and nobody 
complained so far. Personally tested that on old Yamahas, and retriggers 
every time.
I'd say it should work even with much less than 500us, since most of 
envelope circuits I've seen use different sorts of flip-flop, and that, 
however built, should react even at 1-2us

Roman

W dniu 2013-12-18 15:47, Tom Wiltshire pisze:
> Here's the timing for that little circuit, BTW:
>
> http://www.electricdruid.net/GateAndTriggerTiming.png
>
> 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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