Ground: voltage level

sardineta said:

Nigel
this is a good point, can you tell me where TVS's are convenient?
I am using an axial TVS. I guess they protect inputs and outputs pins from power noise or signal noise. There are others TVS in my circuit, one in the reset pin, another between Vdd and Vss and some others in some inputs pins where the circuit is closed by a push botton.

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