Peak and hold driver

[MysticZ]

I just got the main component of the first part of my EFI system for the
Ninja. An LM1949 peak and hold driver IC. It's a TINY (8 pin DIP) little
thing! Now I have to get a basic stamp, figure out the code for it (once
it's running right I'll use the data and figure out how to replace the
stamp with a cheaper, more durable microcontroller. That's for later),
and hook it up to the ignition system (distributorless with one coil per
cylinder), make a throttle body with a TPS, and make it all work.

The circuit for the LM1949 requires a whopping 7 components in addition
to the IC itself (2 resistors, 2 caps, 1 transistor, 1 diode, and, I
believe, a MOSFET). The input is a simple square wave. The hold current
is externally set with the components and the peak current is internally
set at 4x the hold current. The best part of the whole thing is that
National Semiconductor was nice enough to send me a sample since I'm a
student! I love National now :)

Now I need to breadboard the thing, scavenge the injectors from a blown
Isuzu engine I have sitting around, and figure out how I'm going to
increase the fuel pressure (the bike is currently gravity fed). I'm
thinking that a small tank sitting just above the throttle body, fed by
gravity from the big tank, with an electric pump, will work nicely.
-- 
Steve
97 Chevy Camaro Z28, Mystic teal, A4, not stock
90 Kawasaki EX500A4, black, M6, not even CLOSE to stock!
lt1_z28 at ev1.net  http://users.ev1.net/~lt1_z28
Aluminum, steel, carbon fiber, titanium, and two cast iron balls.
McMillan Motorsports- http://www.mmsbikes.com
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