12V circuit protection

Thread Starter

tuuluser

Joined Nov 20, 2011
23
Please advise on this circuit. Input is noisy 10-14.4V DC. Output goes to a 5V stepdown using a Simple Switcher IC, and to some relays and switches.

The LED is supposed to indicate if the PTC is open.

I don't have much room on the board, but I was hoping this would give some reverse-polarity protection, and protect from surges.
 

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