|
Hey
Guys;
I've got my Tach working finally. I used a programmable BCD divide-by-N
counter (CD4522B) mounted on a small piece of prototype board, soldered on the
appropriate jumpers, a couple of resisters, a few leads, sealed it all up with
heat shrink and it made a neat little package to put inline with the EC2 tach
output.
I
set it to divide-by-4, then set the tach for "6 cyl". I chose this as it was
slightly easier for lead routing to set the input pins HI/LOW as required but it
would be just as simple to set for 4 or 8 cyl if desired.
I
haven't yet checked for accuracy, but tomorrow I think I can borrow an optical
tach. It seems to give me the expected engine speeds. I tested it first on a
digital breadboard lab and simulated engine RPM pulses and it divided
accurately. I took some pics of it on the breadboard, then on the prototype board and
a finished package. I will develop film and post pics.
I
bought 25 of these counters from Digi-Key and have a little extra board so I can
make up a few more of them, so if anybody else is using the LS1 coils and needs
to use a regular tach (Rusty?), let me know and you can have one for the price
of a beer if we ever meet in person (if it's American beer, you'd better make it
2 beers :-).
S. Todd Bartrim
Turbo 13B RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm
"Whatever you vividly imagine, Ardently desire, Sincerely believe in,
Enthusiastically act upon, Must inevitably come to pass".
|