Re: DIS ????

[thergen@svn.net]

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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