Spark lines from o'scope

[Clare Snyder]

>A bit of help from you all out there.  I attached my inductive pickup from my
>timing light to the coil wire and hooked it up to a port on the o'scope
>(Chan. A).  Got the nice spark lines and coil ocsilations like I should, but
>as RPM changed, so did the grouping of spark pulses.  
>
>Here is the request:  Is there a simple and cheap ( < $30) circuit that I
>could attach to Chan. B that would adjust for a certain about of pulses
>across the screen, then start over (like when #1 fires).  It should work from
>idle to max RPM (6000).  
>
>A triangle wave generator would give me the sweep, but at a constant
>rate...???..
>
>Any help greatly appreciated.
>
>See ya,
>
>Mike
>
you need a variable time base- like a trigger from the #1 spark plug, the
way normal automotive scopes do.
Better yet, check around for a garage that has updated their scope/analizer
and offer them what it'll cost ya' to do it right to take the doorstop off
their hands. I know  where there are several up here in Ontario.
Delete the R from my address(last name) to reply - gotta try to beat the
spammers!!!
clsnyde at ibm.net