Re: 12v->5v noise
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A pi4 need 3 amp just to run normally. not talking about any device powered by the USB or other power connector on the pi.
A LM7805 will supply 1 amp max continuously and this is with a pretty large amount of dissipated power. If you go from 12v to 5v. just make the calcul of the power that it will need to dissipate. At 1 amp. 12-5= 7 volt times 1 amp = 7 watt that need to be dissipated. I would go with a better designed buck converter circuit that will dissipate less power. and i would filter it a lot more by putting it in a grounded metal box with ferrite on the input and output wire and with small capacitor like 1uf or 0.1uf at the input and output also.
Le jeu. 24 sept. 2020 à 09:13, Randon Loeb <randonloeb18@...> a écrit :