Inductive Pickup Circuit

[Jonathan R. Lusky]

Bob Valentine writes:
> 
> 
> > filtered. The primary on the HEI is basically 0-12V. I recall using a
> > high speed comparator and a little filtering for a vary reliable TTL
> > tach output... just a thought.
> 
>     While we're on this subject, I'm still trying to avoid paying MSD $60 
> for a adapter to use a "normal" tach on a 6A box.  I'm sure I could rig a 
> simple circuit to get a pulse off the HEI pickup that's in the 
> distributor, or even a amplifier to drive the tach off the "tach output" 
> from the MSD box.

Thats what you get for not buying an Autometer tach :)

anyone, why exactly is an adapter required for some tachs but not
others?  Signal too weak?  Too short?

-- 
Jonathan R. Lusky                        lusky at knuth.mtsu.edu
http://www.edge.net/~lusky/                 (615) 726-8700
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68 Camaro Convertible - 350 / TH350  \_/ 80 Toyota Celica - 20R / 5spd