[sdiy] gate/trigger question

[Takuya KATAYAMA]

Dear friends,

MOOG type "trigger" is passive-switch.
The "TRIG" connector is pull-up with R to +Vcc, short the TRIG point
(switch -on) then signal "TRIGGER" goes ON status.
Signal "TRIGGER" is NOT always one-shot-pulse, BUT sometimes continuos
ON status.

ROLAND type "GATE" is active-controll-voltage, continuos level HIGH
during key pushed-down(ON).
Voltage of "GATE" is 10V nominally, threshold level is +5V also nominally.
So, I've made my GATE/TRIG interface has 2 inputs, one is Moog-style
TRIG. pull-up with 3.3kohm R to +5V, the other is GATE input with
threshold of TTL-level.
Outputs are also 2, one is one-shot 5V 10msec pulse, the other is
continuos 10V 2-5mA output.

Takuya KATAYAMA, Muse Music Synthesizer Lab. Tokyo, Japan


caleb_1 at msn.com wrote:

> Dear Experts,
>
> I am trying to build a trigger/gate signal that will start the ADSR. I
> heard that the trigger, which is a short pulse of high voltage,
> actually starts the ADSR envelope. And then the gate is somewhat lower
> in voltage but controls the length of time the note is held. True?
>
> If I was building a gate/trigger output and I wanted it to be able to
> be used by most modular products what you reccommend as the voltages,
> currents, imped.?
>
> Also, any good ideas for circuits as how to get that quick pulse for
> the trigger before the gate?
>
> thanks in advance,
> cj (newbie)
>
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