: Friday, July 25, 2003 9:37 PM
To: emc-p...@majordomo.ieee.org
Subject: self blinking LEDs as EMI sources WAS: LED lamps
Dear All,
I observe recently that some self blinking (and color changing) LEDs 'are'
what seem to be a substantial emitters of radiated emission/interference.
These LEDs
...@majordomo.ieee.org
Subject: self blinking LEDs as EMI sources WAS: LED lamps
Dear All,
I observe recently that some self blinking (and color changing) LEDs 'are'
what seem to be a substantial emitters of radiated emission/interference.
These LEDs are rigged up by hobbyists as decorative illuminators
Dear Ken, John and All,
Further to Ken Javor comments (27/07/2003 02:57 AM):
Mr. Woodgate subsequently humorously commented regarding my assertion
(that
this would be a more credible problem if the handset were a cordless
link).
And his comment was right on target. If that actually was the
I read in !emc-pstc that Wan Juang Foo f...@np.edu.sg wrote (in
of7dfbb2f8.19104f2e-on48256d71.0007ebdb-48256d71.00098...@np.edu.sg)
about 'self blinking LEDs as EMI sources WAS: LED lamps' on Mon, 28 Jul
2003:
I must admit that whichever newspaper that ran the story must have some
team
Interesting observation. You said hum gets louder.
Implying hum is already there. What kind of phone?
Is it only that one telephone instrument?
Only occurs when LEDs are near the instrument, not near the
phone lines with the phone in another location?
Is the effect more pronounced at
demodulation capability.
From: Cortland Richmond 72146@compuserve.com
Date: Sat, 26 Jul 2003 13:06:25 -0400
To: Ken Javor ken.ja...@emccompliance.com, ieee pstc list
emc-p...@ieee.org
Subject: Re: self blinking LEDs as EMI sources WAS: LED lamps
Ken Javor wrote:
... but I wonder
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in bb480cc1.366c%ken.ja...@emccompliance.com) about 'self blinking
LEDs as EMI sources WAS: LED lamps' on Sat, 26 Jul 2003:
I agree with most of Mr. Woodgate's commentary, but I wonder if the
presence of even an rf emission
Ken Javor wrote:
... but I wonder if the presence of even an rf emission (as contrasted
to 50 Hz) should cause any problem to a land-line phone with a wired
handset. It wouldn't seem likely that the
power available from a couple AA batteries would be sufficient for that.
Now if it were a
: Re: self blinking LEDs as EMI sources WAS: LED lamps
I read in !emc-pstc that Wan Juang Foo f...@np.edu.sg wrote (in
of7340f59a.f0a87124-on48256d6f.000df921-48256d6f.0013d...@np.edu.sg)
about 'self blinking LEDs as EMI sources WAS: LED lamps' on Sat, 26 Jul
2003:
These circuits
were
I read in !emc-pstc that Wan Juang Foo f...@np.edu.sg wrote (in
of7340f59a.f0a87124-on48256d6f.000df921-48256d6f.0013d...@np.edu.sg)
about 'self blinking LEDs as EMI sources WAS: LED lamps' on Sat, 26 Jul
2003:
These circuits
were found to (well at any rate, seems to) emit interference
Dear All,
I observe recently that some self blinking (and color changing) LEDs 'are'
what seem to be a substantial emitters of radiated emission/interference.
These LEDs are rigged up by hobbyists as decorative illuminators and acts
more or less like the blinking lights for Christmas trees. I
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