I understand...Thanks ! Just because it's cheap, can I use "Transient Voltage Suppressors (TVS)" VC 1206 05 D 150 (05 = 5.6 VDC Working voltage; D=0.4 J Energy ; 150=18 Volts Clamping)...It's a good choice ? It' s enough to use just one like in picture, or it's better to use one on every IO of PIC ?
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