Thema: PC-Netzteil
Einzelnen Beitrag anzeigen
  #21  
Alt 26.09.2016, 03:11
modmix modmix ist offline
 
Registriert seit: 19.07.2012
Beiträge: 284
Standard

Hallo Marc,
Zitat:
Zitat von boxworld Beitrag anzeigen
aber hat es pauschale Gültigkeit?
Nö.
Noch ein Beispiel, das "normale" SNT durchaus Störungen produzieren können: Trimble Thunderbolt Power Supply Noise - das kann man nach meiner Erfahrung ziemlich 1:1 für Audio übertragen.

Jan Didden liefert mit dem SilentSwitcher ein spannendes Gegenbeispiel:
the SilentSwitcher outputs +/-15VDC at up to 150mA each, as well as a separate supply that can be jumper-selected for 6V, 5V or 3.3.
The +/-15V linear regulators are fed by a dual switcher, working at a high frequency, so as to minimize radiated and conducted noise. Until recently this would not have been an option, but the linear post-regulators I selected have a PSRR of over 60dB at more than 1MHz! Absolutely incredible and exacty what is needed to clench what little ripple remains from the switcher.

the SilentSwitcher can run from a standard 5V USB charger. In my use for the Autoranger, I have it connected to a PowerBank (PB) which is in turn connected to a USB charger. When I want to use the Autoranger completely separated from the mains I just unplug the charger and let it run on the PB. You can already get PBs of say 4000mA-Hrs for fifteen bucks, so that's a very good option. But you can also run it from a wallwart or (LiPo) batteries, anything between 3V and 10V will do.well.
In der Linear Audio Vol 12 gbt es einen Artikel zu Efficient, unity power-factor, low cost audio power amp supplies
This article deals with audio power amplifier power supplies with sine wave current absorption, showing all the benefits these offer for audio systems, these benefits being inherently good power factor providing low RMS current, low harmonic pollution, low transformer over-dimensioning and good form-factor of the output current allowing smaller capacitor values and lower output impedance. Although this is not the purpose of the article, these supplies have obvious ecological benefits as well.
Siehe auch An Ecological Power Supply for Power Amplifiers, by Vincent Thiernesse in audioXpress June 2016

Habe nicht schlecht gestaunt zu sehen, daß ein SNT hilft, die Störungen Richtung Kraftwerk zu reduzieren

Zitat:
Zitat von boxworld Beitrag anzeigen
Möglicherweise hilft hier pauschalieren nicht und es kommt auf den jeweiligen Anwendungsfall an
... und auf die Machart

Ulli
Mit Zitat antworten