If you can knock together a pulse generator that meets the spec of the
input in an hour then go for it but I suspect the fault will still be
present.

Think about it, it worked perfectly until recently, therefore something
changed, I would be amazed if the trigger input being longer than specified
is causing the problem plus a strobe is notoriously hard on the main
reservoir cap, the trigger transformer, the charging circuit for the
reservoir cap and as such it's highly likely that the problem is in the
horrible analogue circuitry, check resistor values, check capacitor values
and check solder joints.

It could also possibly be that the strobe tube is worn out, they have a
pretty well defined lifespan where it's specified to strike at a given
trigger voltage, outside that they become harder to strike and can misfire
or not strike at all.

By all rams tinker with triggering but my money would be elsewhere.

On 25 Jan 2018 14:12, "Darron Black" <darron@griffin.net> wrote:

> Hmm, I reread my post and I decided the tone doesn't come across right.
> I had something come up and just bashed 'send' as I walked out (nearly
> always a mistake).
>
> My "your reaction" paragraph is 100% amused reflection about my friend
> and 0% critical or "my way is better".  Although my way works for me, I
> think very few other people have my particularly strange background that
> makes it so (write FPGA code all the time, have virtually disposable
> FPGA boards lying around everywhere, etc).
>
> Bob's comment is surely the right way for most people to go.
>
>
> Darron
>
> darron@griffin.net
>
>
>
> On 1/25/2018 7:31 AM, Darron Black wrote:
> > It's actually easier.  The FPGA board is already built (I just ran 100
> > of them a couple days ago), I have an existing project for that specifi=
c
> > board that I can copy gut and rework, and I don't stock any 555s or
> > really nearly any through hole passives (heresy? :) )  I have so many
> > embedded Linux systems and FPGA boards lying around I tend to just grab
> > one of those for anything.
> >
> > Your reaction is exactly like a retired EE friend of mine when I
> > suggested nearly the same FPGA board as a solution to his own pet
> > problem.  I told him I'd program an FPGA board of mine and give it to
> > him in an hour... he found the "overkill" unacceptable and proceeded to
> > tinker with a "simpler" circuit for probably a few weeks (really that
> > was more of a "getting around to it"  and waiting on parts problem).  I
> > suppose it was better for him as his solution is entirely fixable by
> > him, whereas my solution would need outside help again if something wen=
t
> > wrong. He had exactly what he wanted when he was done.
> >
> >
> > Darron
> > darron@griffin.net
> >
> > On 1/25/2018 6:28 AM, picram@roadrunner.com wrote:
> >>> I can reasonably easily repurpose a VFD display interface board of
> ours (with an onboard FPGA and 5V level translators) to reconfigure the
> strobe to whatever duration I want... probably 50 microseconds?  The dela=
y
> that way would be very minimal and low jitter.
> >> How about a simple 555 circuit? An FPGA seems a bit of overkill to
> generate one pulse :-)
> >>
> >> - - Bob Ammerman
> >> RAm Systems
> >>
> >>
> >>
> >>
>
> --
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>
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