Digest for sci.electronics.repair@googlegroups.com - 17 updates in 10 topics

"pfjw@aol.com" <pfjw@aol.com>: Feb 23 04:58AM -0800

On Wednesday, February 22, 2017 at 8:48:12 PM UTC-5, micky wrote:
> only noticed because it felt warm in my pocket.
 
> It's got a proximity sensor but I don't remember what it's supposed to
> do.
 
The heat is from the LEDs, not the batteries, and no, the batteries will not last indefinitely. I would guess (SWAG) that each LED will run about 50 ma. So you are pulling 450 ma, or thereabout per hour. If your AAA batteries are middle-of-the-road 1,000 MAH, you have a base of 3000 MAH, so, about 6-7 hours +/- or so. Under normal use, that is 'days'.
 
Peter Wieck
Melrose Park, PA
Jeff Liebermann <jeffl@cruzio.com>: Feb 23 08:44AM -0800

On Wed, 22 Feb 2017 20:47:57 -0500, micky <NONONOmisc07@bigfoot.com>
wrote:
 
>I have one of thoe little 2.5" LED flashlights, that have 9 small LEDs
>and use 3 AAA batteries. It's like the ones that Harbor Freight
>sometimes gives away free, same size, but nicer.
 
Did you notice that almost all such flashlights are made from
aluminum, not plastic, which would be cheaper? That's because
aluminum makes a good heat sink to get the heat away from the LED's.
LED's loose output and efficiency when hot, so it pays to keep them
cool. The COB style of LED mounting is quite common in larger
flashlights, which offer a heat conductive path from the LED to the
aluminum heatsink case.
 
>warm.
 
>It's still really bright, but if it's noticeably warm, how long can the
>baterries really last? Certainly not two days. ?
 
No, it won't run forever. AAA alkaline batteries are good for
1000ma-hr each. At something less than 4.5V for 3 batteries, that's
4.5 watt-hrs. Commodity LED's generate about 50 lumens/watt, so if
your Harbor Freight flashlight managed to belch 15 lumens, it will
consume 0.3 watts. Runtime is therefore an optimistic:
4.5 watt-hrs / 0.3 watts = 15 hrs.
It's probably less because I didn't bother throwing in losses in the
current source, decrease in battery voltage as it runs down, and
heating effects. But, it should give you a ballpark guess as to how
long it will run. My guess(tm) is it will run about 8 hrs with a new
set of batteries.
 
>I once, recently, forgot the screen was lit on my 5.5" smart phone and
>only noticed because it felt warm in my pocket.
 
If your smartphone as a battery usage graph, like all Android phones,
you'll find that it also has a list of which applications are sucking
the most power. The backlighting for the OLED screen is invariably
the highest. If you don't talk on your phone, and don't run any apps,
the battery life of your phone will be totally dependent on the
brightness setting and efficiency of the OLED display, which is about
the same 50 lumens/watt as your white LED. (Yes, I know there are
press releases for >100 lumens/watt, but those are under laboratory
conditions).
 
>It's got a proximity sensor but I don't remember what it's supposed to
>do.
 
Never heard of it. Maker and model number?
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Steve & Lynn <cheryl@must.die>: Feb 22 06:27PM

> This is slightly off topic....
 
 
> From what I am seeing, those transformers are all under rated. A friends
> house has 200A service and his transformer is only 8KVA.
 
WHAT SIZE TRANSFORMER DO YOU SUPPOSE SITRE MAGANA NEEDS IN ORDER TO PLAY
WITH HIS OWN SHIT?
 
HOW MANY VOLT-AMPERES DOES ONE NEED TO FUCK A 72 YEAR OLD MAN AT A GAY ORGY?
 
HOW MANY AMP SERVICE DO YOU NEED TO CUT A HAMSTER TO PIECES WITH A PAIR
OF SCISSORS?
"pfjw@aol.com" <pfjw@aol.com>: Feb 23 04:59AM -0800

Little Timmee got hold of mommy's computer again.
 
If, of course, it even has a mommy.
"pfjw@aol.com" <pfjw@aol.com>: Feb 23 04:51AM -0800

You are either going to have to call the alarm manufacturer, or find the original owners manual.
 
Many (not all) alarms, however, will default to 1234# if there is a power failure long enough to drain the battery, and whatever process holds the memory. This is a slim-to-none chance, but probably worth taking.
 
Our ADT system defaulted this way after about 2 years of downtime. We switched systems as ADT wanted an obscene monthly fee and a very long contract.
 
Peter Wieck
Melrose Park, PA
Jasen Betts <jasen@xnet.co.nz>: Feb 23 05:19AM

> that I almost feel overwhelmed. And I hear they have large minimums and
> shipping, but I never got that far on their websites.... (I have to go
> to a public WIFI to use those sites, since I only have dialup at home).
 
Depending on where you are sometimes they have free shipping.
so far as i know they don't have minimum orders on most common parts,
I think that I heard that digikey has free shipping if you are in USA
and order by mail with cheque enclosed.
 
> I know ebay is an option too, but ordering each item separately can be a
> pain too.
 
yeah... quality can be suspect too, but if y're prepare to be vigilant
it can work.
 
> What (if any) online stores will fit my needs?
> Maybe its none of these huge stores, but something smaller...
 
you could look at "sparkfun" and "adafriut" and "pimoroni", but I'm
not guaranteeing that they will be a good fit for you.
 
--
This email has not been checked by half-arsed antivirus software
Jasen Betts <jasen@xnet.co.nz>: Feb 23 05:49AM


> Amazon seems to police their vendors, almost to a fault. It would be
> interesting to know from the vendor side how it feels to deal with a
> bad buyer (eg. broke the product, tells lies, etc.)
 
Yeah, but they lied to me about the price, "Buy now $3 shipping"
specifically mentioning my location. I clicked the button and they
charged me $30 for shipping.
 
Ironically I was buying a book about fraud by big business.
 
> favor of a bad seller- you *have* to use a method with tracking so not
> cheap. Sometimes you can get partial (maybe half) the money back
> without sending it back. 8-(
 
You don't have to agree to pay shipping on "faulty product" or "not as
described". If the vendor can't make an acceptable offer in the time
allotte aliexpress will take interest in the deal.
 
--
This email has not been checked by half-arsed antivirus software
Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat>: Feb 23 05:50AM -0500

On 23 Feb 2017 05:49:24 GMT, the renowned Jasen Betts
 
>You don't have to agree to pay shipping on "faulty product" or "not as
>described". If the vendor can't make an acceptable offer in the time
>allotte aliexpress will take interest in the deal.
 
I still lost $120 US or so, even after they took interest.
 
Their argument was that it was a relatively large amount of money so I
should lose half. If it was $5 or $10 they probably would have made
the dishonest vendor pay 100%. So, caveat emptor.
 
--sp
 
 
--
Best regards,
Spehro Pefhany
ohger1s@gmail.com: Feb 23 04:35AM -0800

> >vendors (same as EBay) but none of them see your credit card, and
> >until you approve of the product *as delivered*, they don't get your
 
> Is this Aliexpress a company in China, or do they just sell China goods?
 
 
 
Aliexpress is just an umbrella corporation and the goods that come through are sold by many thousands of independent sellers.
 
Think of Aliexpress as a Chinese "buy it now" only ebay.
 
I've had excellent luck, just be sure to check ratings and read the descriptions carefully.
gadgetsservicecentre@gmail.com: Feb 23 12:45AM -0800

Here the Whirlpool LG Authorized repair Service Center in Hyderabad is ready to work on major problem to bring winning result on the same day with no risk
Steve & Lynn <cheryl@must.die>: Feb 22 07:51PM

On 01/30/2017 05:21 AM, Newgene McMensa wrote:
 
> Audio Files
> http://twit.cachefly.net/audio/sn/sn0592/sn0248.mp3 (2010)
> http://twit.cachefly.net/audio/sn/sn0592/sn0592.mp3 (2016)
 
SITRE MAGANA IS THE PORTABLE HAMSTER KILLER. HE CUT HIS HAMSTER TO
PIECES WITH A PAIR OF SCISSORS HE ALSO WENT TO A GAY ORGY WHERE THEY
HAD A NAKED 72 YEAR OLD MAN
Steve & Lynn <cheryl@must.die>: Feb 22 06:23PM

> On Sun, 19 Feb 2017 07:38:58 -0600, Steve Kraus
 
> If they are only a minute off, or even 5 minutes, you're doing good.
> They are not meant for precision.
 
IT TOOK SITRE MAGANA ABOUT FIVE MINUTES TO CUT HIS HAMSTER UP WITH A
PAIR OF SCISSORS.
Steve & Lynn <cheryl@must.die>: Feb 22 06:12PM

On 02/18/2017 08:30 PM, Don Young wrote:
Steve & Lynn <cheryl@must.die>: Feb 22 06:21PM

On 02/18/2017 08:38 PM, Samuel M. Goldwasser wrote:
 
 
> DSOs are great once you have some familiarity with what to expect, but
> can be very deceiving if you don't.
 
SITRE MAGANA'S HAMSTER DIDN'T EXPECT TO BE CUT TO PIECES BY SITRE MAGANA
WITH A PAIR OF SCISSORS.
 
Steve & Lynn <cheryl@must.die>: Feb 22 06:17PM

> ---{Nothing herein constitutes advice. Everything fully disclaimed.}---
> [Homeland Security means private firearms not lazy obstructive guards]
> [Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]
 
NO, SITRE MAGANA HAS ISSUES HE WENT TO A GAY ORGY ONCE AND FUCKED A 72
YEAR OLD MAN.
mhploni@gmail.com: Feb 22 09:59AM -0800


> Can anyone answer my questions and, perhaps, guide me along a bit?
 
> (iFixIt.com seems to only focus on computer and phone devices.)
 
> Thank you for reading this.
 
Thanks to everyone. It seems this brand has a rep for bad relays inside the unit. Like was said below, the unit has unusual zippers and does not open easily. I hope it's not your situation but for me $100 just doesn't come that easily. The company does not respond to e-mails and kept me on hold for nearly 45 minutes when I called and I had to hang up.
 
I will not buy Homedics products.
Steve & Lynn <cheryl@must.die>: Feb 22 06:14PM

> On Tuesday, February 21, 2017 at 12:39:17 PM UTC-5, mhp...@gmail.com wrote:
> I will not buy Homedics products.
 
SO WHAT ARE YOU GOING TO DO NOW? PLAY WITH YOUR OWN SHIT LIKE SITRE
MAGANA LIKES TO?
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