[quote:cfa8799249="Deanus"]I agree with Arera,
and I would go even further, as to put 78L05 regulators on each of the inputs.
[/quote:cfa8799249]
Strange idea, now you must project your 78L05 against spikes etc...
Arera idea will do the trick.
Zener, vsd and resistors are the way to go.
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