lefty,could you point me to a suitable circuit or a specific op amp ?can I use a 741 ?No, that's a hopelessly outdate general purpose op-amp. A popular comparitor is a LM339 chip.if so, how do I set the low(<50mv) reference voltage for the comparator ?No need for a reference really, just wire it as a zero crossing detector with the - input grounded and the + input wired to one side of your magnetic pickup and ground the other side of the pick-upcan I use a pull down resistor to ground ?Not needed, but sometimes comparitors have a high resistance feedback from output to input to add a little hystrisis to the circuit to deal when there is a zero rpm condition and you don't want false pules due to circuit or wiring noise. Best to read the datasheet and get ideas for best solutions and methods.http://www.ti.com/lit/ds/symlink/lm339-n.pdfLeftythe programming aspect I can handle, but I'm a noob at the electronicsthanksrh
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