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Opto-coupler led driver protection circuit

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Ian.M:
As expected.  However when you design the final version, as the current is limited to under 14mA by the NSI50010YT1G, you don't need a 1A rating for D15, so you can simply use a SOT-23 dual Schottky (e.g. BAS70-06) to replace D15 and D16,  to reduce BOM and cost.

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