[Elecraft] Noise from LEDs

[Guy Olinger K2AV]

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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