W
W. eWatson
Guest
Why is that LED flashlights irregularly shut off. I give mine a slight
bang to turn the light on.
bang to turn the light on.
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W
whit3rd
Guest
On Monday, April 20, 2015 at 1:09:57 PM UTC-7, W. eWatson wrote:
Three alkaline cells, each containing a nickel-plated cap pressed against the (-)
electrode, in weak-spring battery connector, which connector is
pressed weakly to the LED leads on one end, and to a switch on the
other, and the switch applies weak pressure to its contacts to turn ON,
and the contact leaf presses the aluminum endcap, which threads
into the aluminum barrel, which in turn presses against the LED wires.
I count fifteen places where metal/metal contact can have a speck of
lint or fingerprint that impedes conduction. Eighteen if three coil springs
in the battery clip just press against the leaf of metal leading to the next
cell.
A connectorized welded-cell battery pack (like in most old cordless phones),
and soldered termination of the LEDs, and solid-state or sealed (reed switch?)
ON/OFF switching, would make it as reliable as my Sonicare toothbrush.
Why is that LED flashlights irregularly shut off. I give mine a slight
bang to turn the light on.
Three alkaline cells, each containing a nickel-plated cap pressed against the (-)
electrode, in weak-spring battery connector, which connector is
pressed weakly to the LED leads on one end, and to a switch on the
other, and the switch applies weak pressure to its contacts to turn ON,
and the contact leaf presses the aluminum endcap, which threads
into the aluminum barrel, which in turn presses against the LED wires.
I count fifteen places where metal/metal contact can have a speck of
lint or fingerprint that impedes conduction. Eighteen if three coil springs
in the battery clip just press against the leaf of metal leading to the next
cell.
A connectorized welded-cell battery pack (like in most old cordless phones),
and soldered termination of the LEDs, and solid-state or sealed (reed switch?)
ON/OFF switching, would make it as reliable as my Sonicare toothbrush.
M
M Philbrook
Guest
In article <mh3mcn$jkr$1@dont-email.me>, wolftracks@invalid.com says...
cheap?
Why is that LED flashlights irregularly shut off. I give mine a slight
bang to turn the light on.
cheap?
W
W. eWatson
Guest
On 4/20/2015 1:54 PM, M Philbrook wrote:
commonly used handheld (5" long" flashlight for about $30. It still has
the irregularity.
When LED flashlights first became available, I bought a DuracellIn article <mh3mcn$jkr$1@dont-email.me>, wolftracks@invalid.com says...
Why is that LED flashlights irregularly shut off. I give mine a slight
bang to turn the light on.
cheap?
commonly used handheld (5" long" flashlight for about $30. It still has
the irregularity.
M
Michael Black
Guest
On Mon, 20 Apr 2015, W. eWatson wrote:
mentions, they may be relying on good contact through the cap, and maybe
worse, the cheap ones are either badly soldered or are put together so
pressure is all that holds the LED leads in place.
I'd also point out that the cheap ones depend on a bunch of LEDs to
provide the light, sometimes that's the selling point, but since they are
using cheap LEDs and barely soldering them together, it's not uncommon to
find completely dead LEDs in some of the cheap ones. I'm not sure if they
are dead or just bad connections that dont' reconnect with a jarring of
the flashlight.
Someone gave me a sort of "trouble light" that used Cree LEDs, just a few.
That thing is very different, tiny little chips that light up bright,
compared to many of the LED flashlights that use a bunch of epoxy cased
LEDs. That thing is a lot more trustworthy than the cheap LED
troublelight I'd prevously bought.
But, the thing runs off three AA or AAA batteries (I can't remember) and
there's some constant drain on those batteries. So it's not safe to leave
the batteries in, they may not be working when you need the light.
Michael
Take a cheap one apart. Besides the battery contact issue someoneWhy is that LED flashlights irregularly shut off. I give mine a slight bang
to turn the light on.
mentions, they may be relying on good contact through the cap, and maybe
worse, the cheap ones are either badly soldered or are put together so
pressure is all that holds the LED leads in place.
I'd also point out that the cheap ones depend on a bunch of LEDs to
provide the light, sometimes that's the selling point, but since they are
using cheap LEDs and barely soldering them together, it's not uncommon to
find completely dead LEDs in some of the cheap ones. I'm not sure if they
are dead or just bad connections that dont' reconnect with a jarring of
the flashlight.
Someone gave me a sort of "trouble light" that used Cree LEDs, just a few.
That thing is very different, tiny little chips that light up bright,
compared to many of the LED flashlights that use a bunch of epoxy cased
LEDs. That thing is a lot more trustworthy than the cheap LED
troublelight I'd prevously bought.
But, the thing runs off three AA or AAA batteries (I can't remember) and
there's some constant drain on those batteries. So it's not safe to leave
the batteries in, they may not be working when you need the light.
Michael
M
Mr. Man-wai Chang
Guest
On 21/4/15 4:09 AM, W. eWatson wrote:
Does this message have an attached image? I didn't see one!
--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (Fedora release 21) Linux 3.19.3-200.fc21.i686+PAE
^ ^ 16:09:01 up 7:58 0 users load average: 0.08 0.03 0.05
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Why is that LED flashlights irregularly shut off. I give mine a slight
bang to turn the light on.
Does this message have an attached image? I didn't see one!
--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (Fedora release 21) Linux 3.19.3-200.fc21.i686+PAE
^ ^ 16:09:01 up 7:58 0 users load average: 0.08 0.03 0.05
ä¸ĺ貸! ä¸čŠé¨! ä¸ć´äş¤! ä¸ć交! ä¸ćĺŤ! ä¸čŞćŽş! čŤčć Žçść´ (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
J
Jasen Betts
Guest
On 2015-04-20, W. eWatson <wolftracks@invalid.com> wrote:
same problem as regular flashlights. non-conductive patina on the contacts
--
umop apisdn
Why is that LED flashlights irregularly shut off. I give mine a slight
bang to turn the light on.
same problem as regular flashlights. non-conductive patina on the contacts
--
umop apisdn