Additional Injector Controller

[Ian Habicher]

>Jörgen Karlsson tapped away at the keyboard with:
>
> > I wonder one thing about the 555, is it really possible to retrigg
> > the 555.  What happens when the trigg pulse come before the
> > previous output pulse has ended, does the 555 reset the capacitor
> > or is the trigg pulse ignored.
>
>The output remains high for the duration of the trigger pulse.
>Triggers don't reset the timer, they only start the timing process.

OK, so if you keep a steady input pulse, then the 555 will keep up a 
continuous output pulse.  Right?  And when you stop the input pulse, the 555 
will continue to produce a normal-length output pulse, then stop.  Is this 
basically correct?

Now, what happens if you give a normal input pulse, on-off, and the 555 is 
producing an output pulse.  Then, _before_ the output pulse is finished, you 
give it another input pulse.  Will the chip simply reset and keep producing 
a longer output pulse, which will stop at the pre-determined time after the 
input?

Basically can the output pulse be 'renewed' by another input pulse before 
the current output pulse is over?

Or will the chip ignore input pulses during the output pulse, causing 
'missed pulses' during high duty cycles?  That's bad.


> > If the trigg pulse is ignored (I belive it is) we have a big
> > problem, the result will be that when the required injector pulse
> > width is longer then the time between the trigger pulses the
> > injectors will only be opened every other trigger event.
>
>Correct.
>
>One can however use the trigger to stretch the output.

That's what I'm wondering :)

Ian
87 RX-7 Turbo II
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