VSS importance

[Mike Morrin]

At 01:48 pm 9/28/98 -0400, Bruce Plecan wrote:
>
>-----Original Message-----
>From: Mike Hoenes <MHoenes at dhr.state.nc.us>
>To: Jake Sternberg <chickens at ccwf.cc.utexas.edu>;
>diy_efi at esl.eng.ohio-state.edu <diy_efi at esl.eng.ohio-state.edu>
>Date: Monday, September 28, 1998 1:00 PM
>Subject: RE: VSS importance
>
>
>>anyone figure out how to get a 730  with a 91 L98 eprom to accept input
>from
>>a 2000ppm vss?
>
>
>Been figuring but not done yet.
>
>I'm assuming you want a 4000ppm, and only have a 2000ppm.
>What I think will work is use two 555 as monostables.  

It would be more elegant to use a 4046 PLL chip with a divide by 2 (JK flip
flop) in the feedback loop. I think this may be shown in the 4046 app notes.

regards,

Mike