[Elecraft] Noise from LEDs

[Eric Swartz - WA6HHQ, Elecraft]

And it looks like its time to close this thread. Wow, 17 posts in less than 22 
hrs.  Time to let others recover from the email overload.

In general, please self moderate in the future.

73,
Eric
List Moderator
/elecraft.com/

On 2/2/2016 4:30 PM, Guy Olinger K2AV wrote:
> Jealous. Transported forward in time, he would have been like a kid in a
> candy store in the midst of all our technology.
>
> Guy K2AV
>
> On Tue, Feb 2, 2016 at 7:03 PM, Wayne Burdick <n6kr at elecraft.com> wrote:
>
>> In California, at least, consumers are converting from incandescents and
>> CFLs to LEDs so quickly that planned new power plants will be unnecessary.
>> This is a Good Thing. Home Depot has massive displays of LED bulbs, which
>> are now down to around $3 per (in the FunSize 3-pack). IKEA is even cheaper.
>>
>> I think everything in our house is now LED except for some candelabra-size
>> 25-W bulbs in the dining room. My wife doesn't like the look of the LED
>> replacements in this category, but eventually they, too will go. Then our
>> electricity consumption due to lighting will be down by 84% for the entire
>> house.
>>
>> Edison would have been amazed to put his hand on a cool 10-W LED bulb
>> that's putting our just as much light as a hot 60-W incandescent. Or maybe
>> he would have been jealous.
>>
>> Wayne
>> N6KR
>>
>>
>> On Feb 2, 2016, at 3:55 PM, David Anderson <gm4jjj at yahoo.co.uk> wrote:
>>
>>> I was just thinking that I had removed all of the CFL bulbs from my
>> house, because I hate them, their horrid colour, their slow start up and
>> that they do not last and smoke. Then tonight my wife called me to say that
>> the hall light had stopped working, the last CFL in the house. No smoke,
>> just dead. It has hardly been used in the years we have had it.
>>> I have replaced all my CFLs with Halogen clear bulbs (40 watts) which we
>> can still get through some loophole, at least for now. I care not that they
>> produce some heat as well as light, as it warms the house up who we have
>> the lights on in the winter. I am stockpiling them.
>>> I have LEDs in the bathroom that don't appear to cause any noise,
>> ironically the 12 V halogen ones before did because of the SMPSU that they
>> used.
>>> I also have a Phillips LED lamp bulb in a table lamp that is totally RF
>> quiet.
>>> 73 from David GM4JJJ
>>>
>>>> On 2 Feb 2016, at 17:44, Ron D'Eau Claire <ron at cobi.biz> wrote:
>>>>
>>>> That sounds like the CFL failed as it was designed to fail.
>>>>
>>>> CFLs draw more current as they age. Eventually the power supply is
>>>> overwhelmed by the current demand and fails. All the CFLs I've seen use
>> a
>>>> tiny (1/8 or 1/16 watt) resistor as a fuse. Before anything else gets
>>>> overloaded enough to fail, the little resistor acts as a fuse and opens.
>>>> But, being a resistor, it fails like a resistor often with some smell
>> and
>>>> brief puff of smoke. I suppose it might be possible for a flame as the
>>>> covering burns, but that should be inside the base enclosure. I've never
>>>> seen anything but a small puff of smoke if I am looking in that
>> direction
>>>> when it goes.
>>>>
>>>> 73, Ron AC7AC
>>
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