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Both of these would be mounted close to the power in to the circuit.
Both diodes would be placed in the schematic with the band toward +12 and the other end to ground.
The idea is to suppress spikes > -0.6V and > 18.8 V. The Peak reverse voltage of the 1n540x diode has to be above 200 V.
This isn't the BEST protection, but it's better than nothing at all. Linear Technology does make an IC that is designed to implement a surge protected 5V supply for automotive use. The automobile electrical environment is extremely nasty.
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