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Plugpack switchmode power supplies...how noisy?

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  • Plugpack switchmode power supplies...how noisy?
• Plugpack switchmode power supplies...how noisy?

• Plugpack switchmode power supplies...how noisy?

  VK3LU > 24-09-2017, 09:09 PM

  Has anyone had any experience with the above with regard to rfi?
  I have my eye on a 12v 2.5 amp one that Jaycar sell that suits my needs and would like to know if it is likely to be noisy.
  
  73 Nev

• RE: Plugpack switchmode power supplies...how noisy?

  VK3RX > 28-09-2017, 04:07 PM

  I don't have experience with the Jaycar one, but some "wall warts" are noisy (and some poorly regulated) and some aren't.
  
  It's a case of try it out, and return if noisy.

• RE: Plugpack switchmode power supplies...how noisy?

  VK3LU > 29-09-2017, 01:47 PM

  Thanks Damien,
  Looks like I will have to suck it and see!
  
  73
  Nev

• RE: Plugpack switchmode power supplies...how noisy?

  VK3ALB > 29-09-2017, 07:08 PM

  Perhaps if you post the catalog number someone else out there may be using one and advise how it works for them?
  
  Sent from my SM-T350 using Tapatalk

• RE: Plugpack switchmode power supplies...how noisy?

  VK3LU > 29-09-2017, 09:15 PM

  Hi Lou
  Good idea. The Jaycar part number is MP3490.
  Has anyone used one and if so, is it quiet?
  
  Nev

• RE: Plugpack switchmode power supplies...how noisy?

  VK2ZIW > 30-09-2017, 06:34 AM

  Hi Lou,
  
  5V 1A, 12V 1A etc.. I haven'v found a quiet one yet.
  
  It's all about the long wire you attach to it:
  
  Plug-Pak------radio------long wire(coax)------Antenna
  
  Here, I put a clip-over ferrite suppressor over the DC wire with as many turns as possible.
  
  ADSL router plug-paks are a big big problem with the router network cables and phone line all radiating!!
  
  It's NOT fun. (HF that is)
  
  Alan VK2ZIW

• RE: Plugpack switchmode power supplies...how noisy?

  VK3LU > 30-09-2017, 06:49 PM

  Thanks Alan
  I have a couple of clip on ferrites so I will be prepared.
  If the plug packs are that noisy then it seems like they are not made to any specification.
  We will see what eventuates.
  
  73
  Nev

• RE: Plugpack switchmode power supplies...how noisy?

  VK3YCQ > 01-10-2017, 09:58 AM

  Hello Nev
  
  Try aiming your antenna at some of the cheaper LED downlight 'electronic transformers'. Going by what I have observed, particularly regarding noise level indicated on the s-meter on 2 metres, there is no regulation of electrical standards any more. Specification? What a joke.
  
  73s , Ian
  VK3YCQ

• RE: Plugpack switchmode power supplies...how noisy?

  VK3LU > 13-11-2017, 06:56 PM

  I have answered my own question.
  I purchased an MP3490 (12v 2.5A) from Jaycar. It emits a slight amount of noise at the lower end of HF.
  I wound as many turns of the generous 12v lead as possible around an FT114-43 I had lying around and connected a .01uf cap across the output.
  Noise gone! Simples.
  Just gets warm powering the FT817nd
  
  Nev
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