> 1N5818 which is small, cheap, and readily available

We had a lengthy discussion about this some years ago

The outcome, ISTR, was that a 1N4001 or 1N4148 is better
than a Schottky

I might be inclined to have a diode for each coil and perhaps look
at something at the driver end too, considering the length of cable

Maybe a reverse-biased Schottky to catch sub-0V transitions,
and a zener to clamp > Vcc transitions.

I've found from experience that relay coils will quite readily induce
undesirables onto wiring

Joe
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