Im currently building an AutoX car which I would like to fit a shiftlight to. ( If you dont know this is a light to tell you when engine revs are at there peak and you should change up a gear! )
Does anyone know of a circuit that will count the number of pulses from the coil and give a warning at a set number of pulses (revs)
the sole difference betwene the LM2907 and the LM2917 is that the LM2917 has a built in zener on pin 9, hence you can use the LM2917 and omit the zener in the circut diagram.