Re: DIS ????

[thergen@svn.net]

I didn't intend to have a pullup on the cap.  Here's what I should have
sent:

  74hct04      
               
    |\         
----| o---|(---o--------- to dis 
    |/         | 
         1uf   /
               \ 10k
               /
               |
              gnd

capacitor should be a non-polarized type
try a smaller non-poplarized cap if 1uf not available



On Sat, 29 Jan 2000 thergen@svn.net wrote:

> Bruce,
> 
> You might try something like the following.  The main differences compared
> to what you're using is that the signal would be AC coupled allowing
> postive and negative voltage swings to the dis input and the 74hct04 and
> source and sink 25ma (the 2732 can't source much current).
> 
> 
> View with fixed width font.
> 
>               +5v
>                | 
>                /
>   74hct04      \ 10k 
>                /
>     |\         |
> ----| o---|(---o--------- to dis 
>     |/         | 
>          1uf   /
>                \ 10k
>                /
>                |
>               gnd
> 
> capacitor should be a non-polarized type
> try a smaller non-poplarized cap if 1uf not available
> 
> 
> Tom
> 
> 
> 
> 
> On Sat, 29 Jan 2000, Bruce Plecan wrote:
> 
> > Any one got a crank posistion sensor like used with a 7 notch crank, ie 87
> > 2.8-90  3.1L (con you measure it's resistance)?
> > Traning manual says it's a reluctor.
> > I can hook a dissy to the DIS module, and spin it randomly, and get a coil
> > to fire (well a LED).
> > So at least the module works.
> > Now I got the pulse generator that simulates the 7 notches passing the
> > pickup.  The pins for the reluctor at the module, 2 seem to be ground, and
> > the other floating (reads no voltage).
> > I can hook a LED across the dissy, and at about the same speed that triggers
> > the module lights the LED without burning it out, so the singnal is A/C, and
> > about 1.8v
> > I'm using the output of a 2732 as the "input" to the module.  I've used it
> > as a pull up, and pull down with a 1K resistor, and LED.  I tried a cap
> > (well numeruos ones) and I can't get a steady firing of the coil.
> > No connections to the EST Bypass or ref.,  the low ref is grounded.
> > Any ideas welcome, and if it takes a Pizza I'll try to e-mail one to the
> > person with the right answer.
> > Cheers
> > Grumpy
> > 
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> 
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