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• #8266 rostiron őstag

  Új Válasz 2024-12-26 15:54:14 #8266

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  rostiron

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  Sziasztok.
  Még nincs meg a Pi-m, de azért próbálok okosodni és utánaolvasni dolgoknak.Találtam egy volumio fórumon ezt . Erről mi a véleményetek ?
  "
  Linear power supplies are a waste of money in almost all cases.
  If you’re worried about noise, either transmitted or conducted, know first that by far the main source of noise in any PSU/Pi combination is the Pi because it’s a poorly shielded high frequency device and an active source of relatively high powered multi-frequency interference.
  To control transmitted (over the air) noise, put the Pi in an aluminium case and ensure the case is grounded for example by using metal standoffs.
  To prevent conducted noise, particularly mains frequency ground loop noise, use digital outputs that are intrinsically resistant to conducted noise and eg a USB isolator (pay no more than $10) or other ground isolation device, which is basically a small 1:1 transformer on the ground connection between the Pi and the audio equipment. Assuming it’s a problem. In the audio devices, you should favour ‘balanced’ audio connection schemes.
  The noise from the Pi is inherent in your design with or without an expensive fancy ‘audio’ power supply. The 5V/5A/25VA stock Pi5 power supply recommended by the manufacturers is perfectly adequate and well constructed enough to do the job.
  A decent but cheap mass produced switched mode supply will be functionally equivalent to any linear supply of the same output spec, and it will probably have better short protection, under and over voltage protection etc. The rest is marketing, an electron is an electron…
  With a Pi4, you can normally get away with a 3A stock supply, but you do need to have the capability to push the Voltage up to about 5.3/5.5V as the Pi4 is a bit fussy about voltage and doesn’t like droop."

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