Spark lines from o'scope

Andy Clay andyc at t130.aone.net.au
Fri Oct 10 13:13:05 GMT 1997


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A70Duster at aol.com wrote:
> 
> 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

I have used this system as a tunescope on my cars for years now. It is
very simple,
and about as cheap as can be.  Mail me if you need any more info.

Cheers.... Andy

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