[HCARC] Fw: [Rmg] Check out LED light bulb disturbances - YouTube

[Bill Tynan]

Here's more on LED lamp bulbs.

Maybe there's good new after all.

73,

Bill Tynan, W3XO

----- Original Message ----- 
From: "Bob Ripley" <bobripley at austin.rr.com>
To: "'Email reflector for K5RMG club'" <rmg at k5rmg.com>
Sent: Wednesday, April 11, 2012 7:52 PM
Subject: Re: [Rmg] Check out LED light bulb disturbances - YouTube


>I have tested many LED lamps that make no noise. They have minimum
> electronics. You can be fairly sure if the lamp is for a single voltage
> Then it does not have a DC to DC converter that makes noise. The good ones
> have a simple Bridge rectifier followed by a capacitive voltage divider.
> Bob W5EMC
>
> -----Original Message-----
> From: richard allen [mailto:rca at rcallen.com]
> Sent: Tuesday, April 10, 2012 10:51 PM
> To: Email reflector for K5RMG club
> Subject: Re: [Rmg] Check out LED light bulb disturbances - YouTube
>
> Scary stuff.  Thanks for the link.
> (Hi Mattie) ...
>
> 73,
>
> Richard W5SXD
>
> "Bill Tynan" <billandmattie at windstream.net> wrote:
> (04/10/2012 12:20)
>
>>I don't know what the effect might be at VHF and microwave frequencies, 
>>but
>
>>the potential problem is disturbing.
>>
>>I have long felt that such a problem would exist as LEDs operate at low
>>voltages, so they have to have switching power supply in the base of the
>>lamp.
>>
>>This confirms it.
>>
>>73,
>>
>>Bill, W3XO
>>
>>----- Original Message ----- 
>>From: <W4wj at aol.com>
>>To: <hcarc at mailman.qth.net>
>>Sent: Sunday, April 08, 2012 12:02 AM
>>Subject: [HCARC] Check out LED light bulb disturbances - YouTube
>>
>>
>>> _Click here: LED light  bulb disturbances - YouTube_
>>> (http://www.youtube.com/watch?v=o8zMhjXcmoA)
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>
>