Washing Machine, Voltage Spikes, Speakers Pop - Page 2

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Re: Washing Machine, Voltage Spikes, Speakers Pop


  First, the electronic power supply should have made such
trivial line noise irrelevant.  But if selling a clone type
product, then many simply forget to include some functions.  A
typically line filter can be installed to do what the power
supply should have already included.  Some examples of that
solution:
  http://www.schurterinc.com/products/usa/pemfilter.asp
  http://www.corcom.com /
  http://www.cor.com/PDF/Q.pdf

  Other solutions start inside the source.  For example,
snubbers can be installed across offending switches.  Quash
the noise at the source of that noise.  Recommendation such as
interactive UPS for such simple problems reeks of technical
naivety.  Simple noise is eliminated at the source AND is made
irrelevant when the electronic power supply is properly
constructed.

Archades wrote:
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Re: Washing Machine, Voltage Spikes, Speakers Pop



"Archades"
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**  The only fix that really works is to fit RC snubbers to the fan and
washer.

The spark energy from the switches on the fan and inside the washer is a mix
of audio and RF frequencies that is radiated by the AC wiring in the house
and injects the noise into speaker and other audio cables in the hi-fi
system.



.........  Phil





Re: Washing Machine, Voltage Spikes, Speakers Pop


On Sun, 13 Nov 2005 23:49:40 +1100, "Phil Allison"

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Just a quick warning. Depending upon the way the motor is driven, it
may be a bad idea to fit snubbers. The fan i cant see being a problem,
but with many new washing machines using IGBT drives, a poor choice of
snubber can fry the the output. In most cases, the IGBT drive will be
noise free, but sometimes they are not.

Washing machine solenoids are sometimes driven with IGBT's too, to get
a variable flow rate. Same applies as the motor.


Re: Washing Machine, Voltage Spikes, Speakers Pop



"The Real Andy"
Phil Allison
Quoted text here. Click to load it


**   Err  -   the "snubber" only needs fitting to the AC lead of the washer,
inside the washer.

 My 7 year old " Simpson "  top loader had no RFI suppression if any kind.

A simple 0.047 uF  class X  cap across the AC lead did wonders.




.........  Phil



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