Security concerns about the external power supply connected to the my map of 9401 TTL inputs

I have an external power supply (5V DC, 500 my) that I use to test my card 9401 count entries and check my LV code is working properly. Power + 5V is used as high signal and ground as a weak signal.  I haven't done the link yet because I wanted to know if there is any concern to burn my card.

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Hello

Normally, if everything is OK, it shouldn't be a problem.

But in the real world "things" happen

My Advisor is to add resistance series (in this case 1 k) to protect your device if Murphy enters the room something goes wrong.

Tags: NI Hardware

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