[sdiy] Trigger to Gate Converter?

[carlile at ece.utexas.edu]

I've got a tiny circuit based around a NPN transistor in my Casio SK-1.  When a 
+5v trigger is feed into an 1/8" jack it is just like pressing the 'One Key 
Play' button manually.  In this manner I can step through the sequencer of the 
SK-1 with a trigger from a drum machine.

The problem is the trigger from my drum machine is a very short pulse and it 
has the effect of quickly tapping on the one key play button.  The sample in 
memory does not play for very long.  This is ok for quick percussive sounds, 
but not suitable for anything else.  Is there any sort of simple circuit out 
there that would act like a trigger to gate converter?  I'd ideally like to 
find something that has a control for the length of the gate time, so I could 
essentially stretch the length of the pulse to match how long I'd want the 
sample to play.  Thanks for any info,
-Jim

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