Building a stimulator

[Wayne Macdonald]

I am building a stimulator to run a Sagem ECU on a test bench, I want to
generate the crank trigger from a micro but I am having problems.
The ECU expects to see a waveform from a normal two wire crank trigger, The
square wave I am generating does not seem to fool the ECU.
Can someone help me with the circuit required to convert a square wave into
a sine wave.

Thanks

Wayne

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