Digest for sci.electronics.repair@googlegroups.com - 14 updates in 4 topics

"Ron D." <ron.dozier@gmail.com>: Dec 27 01:38PM -0800

Plymouth hall pick-up. Been there done that.
 
1968 Chrysler. Would not go up a really steep hill. Temporary solution. Go around. real problem - Check valve popped out of fuel pump.
 
1982 Toyota. car warmed up. Turn off car for about 20 minutes (quick bite to eat). Really low idle when re-started. Had to cool for an extended time to work properly again. Rinse repeat. It constantly did this.
 
To prevent dieseling, a vacuum advance port was opened to the atmosphere (severe vacuum leak). The solenoid valve was mounted on top of the valve cover with limited cooling. It stuck every once and a while. Me Finding the problem was really tough.
 
Car ate clutches and/or throwout bearings. Professionally replaced (dealer) until I finally did it myself. A HUGE diameter bolt (~3/4 diameter metric style) was missing on the bell housing. It used two big bolts and multiple smaller ones (4-6).
 
Care stereo amplifier stolen and replaced lb for lb by lentils.
 
Muffler and pipe replaced professionally. Got home and it did not sound right. Found it on backwards. When to shop and they agreed, before I left, I started the car and it still did not sound right. Looked - still on backwards. Technician told boss that it fit better that way. Replacement pipe was bent improperly.
 
Mechanical fuel pump replacement off an interstate in a random development. Fuel pump push rod kept falling out when replacing the pump UNLESS you put grease on it first.
 
Headlights start blinking - on/off period about every 30 seconds. Lamp filament shorted - High to low beam.
tabbypurr@gmail.com: Dec 27 02:52PM -0800

On Wednesday, 27 December 2017 21:38:53 UTC, Ron D. wrote:
 
> Care stereo amplifier stolen and replaced lb for lb by lentils.
 
bizarre! I once had a car stereo I got for 30p, quite a good one and worked fine but the front was very cosmeticly damaged. Some idiot broke in and stole it. I doubt he got more than £1 for it.
 
 
NT
Sofa Slug <sofaslug@invalid.invalid>: Dec 28 07:53AM -0800


>> Care stereo amplifier stolen and replaced lb for lb by lentils.
 
> bizarre! I once had a car stereo I got for 30p, quite a good one and worked fine but the front was very cosmeticly damaged. Some idiot broke in and stole it. I doubt he got more than £1 for it.
 
> NT
 
Back in the 70s, I had someone steal one of those cheap Krako FM
converters (for an AM radio) out of my Volkswagen bus. Whoever stole it
left a dollar bill in it's place.
tabbypurr@gmail.com: Dec 28 08:23AM -0800

On Thursday, 28 December 2017 15:53:34 UTC, Sofa Slug wrote:
 
> Back in the 70s, I had someone steal one of those cheap Krako FM
> converters (for an AM radio) out of my Volkswagen bus. Whoever stole it
> left a dollar bill in it's place.
 
maybe they were krackers
 
 
NT
harry newton <harry@is.invalid>: Dec 28 11:31AM

What free cross-platform benchmark tools do you use to benchmark phones?
 
I bought a handful of Costco $130 Android LG Stylo 3 Plus phablets as
stocking stuffers that I wish to benchmark against my sister's $670 iPhone
7 Plus.
 
T-Mobile LG Stylo 3 Plus (aka TP450):
<https://www.t-mobile.com/cell-phone/lg-stylo-3-plus>
<http://www.lg.com/us/cell-phones/lg-TP450-stylo-3-plus>
<https://www.gsmarena.com/lg_stylo_3_plus-8694.php>
T-Mobile Apple iPhone 7 Plus:
<https://www.t-mobile.com/cell-phone/apple-iphone-7-plus>
<https://www.apple.com/iphone-7/specs/>
<https://www.gsmarena.com/apple_iphone_7_plus-8065.php>
 
I can compare them based on pure hardware specs but benchmarks are better:
<https://www.phonearena.com/phones/compare/LG-Stylo-3-Plus,Apple-iPhone-7-Plus/phones/10534,9816>
 
The problem is most Internet benchmark test results are platform specific:
<https://www.androidbenchmark.net>
 
And most free benchmarking tools seem to only work on one platform:
<https://www.greenbot.com/article/2843337/test-your-android-phones-performance-with-these-free-benchmarking-tools.html>
 
Hence the consumer-available cross-platform benchmark question:
Q: What free cross-platform benchmark tools do you use to benchmark phones?
"David Farber" <farberbear.unspam@aol.com>: Dec 27 12:31PM -0800

whit3rd wrote:
 
> Those regulators are available in fullpak (epoxy insulated tab),
> metal-tab-wth-hole, and short-metal-tab (for soldering to a surface
> mount "heatsink").
 
Yes, the tab is for heat sinking and your suggestion of using the Molex plug
and socket is very clever.
 
Thanks for your reply.
--
David Farber
Los Osos, CA
"David Farber" <farberbear.unspam@aol.com>: Dec 27 03:11PM -0800

Phil Allison wrote:
 
> Bolting the positive one straight to the chassis is likely to result
> in ground loop hum.
 
> ... Phil
 
Hi Phil,
 
The original ones do not have any insulating bushings or mica pads. They are
mounted to the chassis with 3mm bolts and some thermal grease. I contacted
Digi-Key but they could not tell me if their parts were insulated or not.
When I place my order, I will get the insulating pads and bushings just to
make sure.
 
By the way, you can get a schematic here.
http://music-electronics-forum.com/attachments/6789d1256948271-behringer_pmh2000_-et-.zip
 
Thanks for your reply.
--
David Farber
Los Osos, CA
John Robertson <spam@flippers.com>: Dec 27 06:06PM -0800

On 2017/12/27 12:31 PM, David Farber wrote:
 
> Yes, the tab is for heat sinking and your suggestion of using the Molex plug
> and socket is very clever.
 
> Thanks for your reply.
 
I would not agree with using a socket if the regulator flexes slightly.
You will run through the insertion limit number of the socket very
quickly. Rather, can you solder a flexible loop to the regulator leads -
assuming the PCB and the heat sink are not well joined so there is some
flex.
 
I have seen sockets used in similar situations in arcade games and the
failure rate is significant. Connectors are the principle point of
failure after all...
 
John :-#)#
 
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
ggherold@gmail.com: Dec 27 06:44PM -0800

On Wednesday, December 27, 2017 at 2:43:04 AM UTC-5, Phil Allison wrote:
> > packaged in a TO-220 case. The center tab is nonmetallic so it is insulated
> > from the chassis.
 
> ** The *mounting tab* is definitely metal, just coated in epoxy to insulate it.
Huh, we buy either spendy teflon shoulder washers, or cheaper nylon.
(with 4-40 screw.)
 
George H.
Phil Allison <pallison49@gmail.com>: Dec 27 08:43PM -0800

gghe...@gmail.com wrote:
 
---------------------
 
> > insulate it.
 
> Huh, we buy either spendy teflon shoulder washers, or cheaper nylon.
> (with 4-40 screw.)
 
** JRC make "full pack" versions of the popular 7815/7915, TO220 regs.
 
Types are JRC7815A and JRC7915A.
 
https://img.alicdn.com/imgextra/i3/TB1s_M9IpXXXXc_XVXXXXXXXXXX_!!0-item_pic.jpg
 
 
The pak is called a T220F
 
Lots of ICs are made like this, with a penalty in the thermal resistance spec.
 
 
..... Phil
Jeff Liebermann <jeffl@cruzio.com>: Dec 27 08:48AM -0800

On Wed, 27 Dec 2017 15:28:50 +0000 (UTC), harry newton
 
>"After replacing the battery, Geekbench showed that the scores had nearly
>doubled."
 
><http://nymag.com/selectall/2017/12/is-apple-slowing-down-iphones-with-aging-batteries.html>
 
Sure, but if Apple did NOT reduce consumption somewhere as the battery
aged, you would complain that the iPhone battery didn't survive the
warranty period or operate the advertised number of hours.
 
What I find disgusting is that Apple did not make the feature optional
and controlled in the settings.
 
When we're done complaining about the evil Apple, we can then switch
our focus to the evil Google, which extends runtime and battery life
by disabling display intensive features and reducing OLED display
brightness if it detects a weak battery.
<https://www.google.com/patents/US8407502>
See the "Summary" section. The phone still works, but all the fancy
features are disabled and you can't see what you're doing (only red
LED's are active). This might be a serious problem for someone on
Viagra, who's vision is shifted towards blue, and doesn't see any red.
 
Cutting features to enhance battery life is nothing new. Palm has a
patent for saving battery power by switching from battery guzzling
color, to a more economical monochrome:
"Method and Apparatus for Selectable Display Mode for Intelligently
Enhancing Battery Life"
 
Meanwhile, Intel offers CPU's that self-throttle if they draw too much
power, get too hot, or are in danger of turning off before the end of
the movie or big game. Most of the technology was inherited from
Transmeta:
"Adaptive power control"
<https://www.google.com/patents/US7100061>
<https://en.wikipedia.org/wiki/Transmeta>
 
I'm sure if I dig some more, I'll find other patents for ways to
generate longer battery life numbers at the expense of other features.
 
Hmmm... my battery is low and old. Maybe that's why I'm losing at
Solitaire?
 
--
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
tabbypurr@gmail.com: Dec 27 09:04AM -0800

On Wednesday, 27 December 2017 16:48:57 UTC, Jeff Liebermann wrote:
> generate longer battery life numbers at the expense of other features.
 
> Hmmm... my battery is low and old. Maybe that's why I'm losing at
> Solitaire?
 
Apple phones are very much aimed at people that know nothing about technology and don't want to learn. They're idiot proofed partly by key useful features not being available. One can criticise them, but tbh I reckon they know their market.
 
 
NT
harry newton <harry@is.invalid>: Dec 27 05:05PM

He who is Jeff Liebermann said on Wed, 27 Dec 2017 08:48:50 -0800:
 
> Sure, but if Apple did NOT reduce consumption somewhere as the battery
> aged, you would complain that the iPhone battery didn't survive the
> warranty period or operate the advertised number of hours.
 
Fair enough observation but the Materials Science experts seem to be
inferring a different take on that same sentiment, by stating that Apple
batteries were sold with intolerable (and unadvertised) performance decay.
 
They "clearly came with intolerable performance decay." says The Verge.
<https://www.theverge.com/2017/12/21/16806582/apple-battery-slowdown-science>
 
> What I find disgusting is that Apple did not make the feature optional
> and controlled in the settings.
 
Lawsuits argue Apple had to keep the permanent throttling to far less than
half the advertised speeds (from 1,400MHz to 600MHz) secret if the reason
was they didn't want to honor warranty claims.
 
<https://www.theverge.com/2017/12/20/16800058/apple-iphone-slow-fix-battery-life-capacity>

> our focus to the evil Google, which extends runtime and battery life
> by disabling display intensive features and reducing OLED display
> brightness if it detects a weak battery.
 
This is only related if it was done secretly, permanently, and drastically.
 
> See the "Summary" section. The phone still works, but all the fancy
> features are disabled and you can't see what you're doing (only red
> LED's are active).
 
Is this slowdown drastic (far more than half the advertised speeds)?
Is it secret?
Is it permanent (for any given battery)?
 
> This might be a serious problem for someone on
> Viagra, who's vision is shifted towards blue, and doesn't see any red.
 
As of December 11th, 2017, that problem may increase!
<https://www.goodrx.com/blog/generic-viagra-in-2017-sooner-than-expected/>
 
> color, to a more economical monochrome:
> "Method and Apparatus for Selectable Display Mode for Intelligently
> Enhancing Battery Life"
 
Is this slowdown drastic (far more than half the advertised speeds)?
Is it secret?
Is it permanent (for any given battery)?
 
> "Adaptive power control"
> <https://www.google.com/patents/US7100061>
> <https://en.wikipedia.org/wiki/Transmeta>
 
Is this slowdown drastic (far more than half the advertised speeds)?
Is it secret?
Is it permanent (for any given battery)?
 
> I'm sure if I dig some more, I'll find other patents for ways to
> generate longer battery life numbers at the expense of other features.
 
IF they're not secret, permanent, and drastic (throttled to far less than
half the claimed CPU speeds), then they're relevant.
 
Otherwise they're just red herrings.
 
> Hmmm... my battery is low and old. Maybe that's why I'm losing at
> Solitaire?
 
Nope. It's why that huge power outage a week ago by PG&E was caused by the
winds coming from the north instead of from the south like they usually do
where you live!
 
Seriously though ... since you are generally old-school and balanced, do
you really consider Apple's secret, permanent, and drastic (the cpu is
chopped to far less than half the claimed speeds) is equivalent to a
temporary, slight, and obvious slowdown?
 
Really?
rickman <gnuarm@gmail.com>: Dec 27 11:22PM -0500


>> Hmmm... my battery is low and old. Maybe that's why I'm losing at
>> Solitaire?
 
> Apple phones are very much aimed at people that know nothing about technology and don't want to learn. They're idiot proofed partly by key useful features not being available. One can criticise them, but tbh I reckon they know their market.
 
Even the unsophisticated user can tell when his phone is getting slow. Many
people will then trade it in not knowing this could easily be fixed.
 
--
 
Rick C
 
Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
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1 Response to Digest for sci.electronics.repair@googlegroups.com - 14 updates in 4 topics

March 20, 2020 at 12:12 AM

Thank you I really appreciate your help.

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