MOTM

I chose to use a gate and a trigger.  The gate going false will 
'cancel' a pending delayed trigger.  The gate input is normaled to 
'true'.  I made a dual delay and normal'd the second to the first.  
Thus I can cascade them for even longer delays.  I also had to decide 
if I wanted a subsequent trigger should restart the delay (e.g. 
retrigger) or be ignored.  Eventually I made this switch selectable 
and I do use it both ways.

Details and schematics on
http://modularsynthesis.com/modules/DJB-008/djb008.htm

I used a 4538 one shot which worked quite well.  To do it over again I 
might add a variable pulse width.  My delayed trigger is a fixed 5 mS 
trigger and there have been times I'd like to have stretched that a 
bit.  The LED indicator simply shows delay time.  It turns on when a 
trigger has started the delay and turns off when the delayed trigger 
occurs.

Dave

--- In motm@yahoogroups.com, Scott Juskiw <scott@t...> wrote:
> I had planned to build a digital gate delay (the TLN-774), but 
that's 
> been on the back burner for two years now, I may never get it done. 
> So maybe a simple MUUB gate delay would be useful in the meantime. 
> There is space on the MUUB boards for adding a 7555 timer chip.  I'd 
> like to fit two gate delays into 1U of space, so it would have to be 
> very simple, just a delay of the rising edge of the gate, not the 
> falling edge.
> 
> 1. delay time pot and jack
> 2. input gate jack
> 3. output delay jack
> 4. LED
> 
> What other features would we need? Maybe a hold time on the delayed 
> gate, if that's not too complicated for a MUUB.