I'm trying to interface an arduinoscope to sample then view on my computer the Back-EMF around a pulsed coil. The specificity of coil system is to generate under special resonance a ringing Back-EMF hence positive & negative voltage spikes.
What circuit do you recommend to connect my coil to say ADC0 having in mind I need over-voltage protection wether positive or negative spikes to not destroy arduino board.
P.S. I happen to have both duamilanove & mega, the latter can sample in differential mode.
Thank you in advance