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Message: <blockquote data-quote="mcglsr2" data-source="post: 1392482" data-attributes="member: 15705"><p>Also, flyback diodes (a.k.a. quenching diodes) should be wired across the coil (85 and 86) to prevent voltage spikes when the coil is de-energized.  Even in low voltage applications, the voltage build-up of the collapsing field can be surprisingly high and feed back into the switching device that energized the coil, damaging the switch.  While it's possible to get away without using one, it's pretty good practice to use one anyway.</p></blockquote><p></p>