speedo converter needed

[Kevin]

Hey Mike, I was thinking about this one before...

I think what you can do is get a National LM 2917... it is a frequency to
voltage converter using a change pump... then take that voltage.. and throw
it into a pot... that will vary the voltage.. now just feed the varying
voltage into a 555 to make a squarwave output with a frequency dependant on
the voltage coming in.  Just an idea

Cheers,

Kevin


>Does anyone have a simple frequency converter circuit that could be used to
>calibrate a typical inductive pickup signal to the proper frequency based
on
>different tire and gear ratios?  I envision a circuit that would use the
>stock pulsed signalk from the tranny and then provide a fine tuning trim
pot
>that would vary the frequency up or down based on the above parameters.
>
>Mike
>