Digest for sci.electronics.repair@googlegroups.com - 5 updates in 4 topics

ceg <curt.guldenschuh@gmail.com>: Aug 21 04:52PM

I just got a new home broadband router that has both 2.4GHz & 5GHz
and only then did I realize that both the Windows and Linux laptops
don't have a 5GHz Wi-Fi card (both only have 3.4GHz 802.11 b/g/n).
 
Neither has either 5GHz or 802.11 ac.
What are my options?
 
Note: I called Dell Hardware Sales for the "Inspiron 15 3521" at
800-289-3355 but they don't even have a part number for an internal
5GHz NIC, so they suggested an external USB stick, Dell part number:
$60 + tax (free shipping) Netgear A6068352
$50 + tax (free shipping) Linksys A8024912
 
Googling, I find some of the specs here:
 
"Netgear N900 Wireless Dual Band USB Adapter"
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=bsd&cs=04&sku=A6068352
 
"Linksys Mini AC Adapter AC580"
http://accessories.dell.com/sna/productdetail.aspx?c=us&l=en&s=bsd&cs=04&sku=A8024912
 
My question is whether any of you experts has experience fitting an
*internal* 5GHz NIC into a Dell laptop, and whether it's true what
Dell said, which is that no internal Wi-Fi card will work?
 
If I must add 5GHz Wi-Fi externally, do you have suggestions as to how
to get a good 5GHz (ac) Wi-Fi USB stick that is both convenient and
powerful at a good price?
root <NoEMail@home.org>: Aug 21 04:44PM

When I have encountered power supply problems in the past
I have just replaced all the caps. I have wanted to get
an in-circuit ESR meter but they either came as kits or
were more than I wanted to pay. A while ago someone posted
here that one could get a functional ESR meter from China
for under $30. I hastily did a web search and found this:
http://www.dx.com/p/lcr-t4-meter-tester-for-capacitance-esr-inductance-resistor-npn-pnp-mosfet-m328-yellow-multicolor-364576
 
I ordered one and after several weeks it came today.
I hadn't paid attention to the picture. The device came
without any instructions. There is an EZ-insertion socket
which as far as I can tell utilizes only three pins, say
1,2,3. The unit works fine for testing resistors connected
either from 1-3 or 2-3 or 1-2. I wanted to test some
capacitors in circuit so I cut a clip lead in half and
connected the wire ends to pins 1-3. The device seems
to read electrolytic capacitors as diodes but gives
two uF readings which bear no relationship to the values
written on the capacitors. For example, an 800uF cap
might read 1.3v, 2.1uF.
 
I am hoping that someone in this group can shed some
light on the device, specifically how it can be used
to tell me which caps have to be replaced in some
device.
 
Thanks.
Analogman2 <analogman2004@yahoo.com>: Aug 21 06:36AM -0700

I plan on pulling of the back cover today to see if any caps in the PS are bulging. Maybe check with an ESR meter as well. As far as sound, the sound went out shortly after I bought the TV a good 5 or more years ago but since I have surround sound, I never bothered to do anything about it. The set is very heavy and requires 2 people to move it.
 
If this is an ESR capacitor problem, does heating the caps up cause ESR to lower?
"Arfa Daily" <arfa.daily@ntlworld.com>: Aug 21 04:37PM +0100

"Analogman2" <analogman2004@yahoo.com> wrote in message
news:cf4f44ca-cd01-49ed-90aa-84fb2f06d800@googlegroups.com...
> set is very heavy and requires 2 people to move it.
 
> If this is an ESR capacitor problem, does heating the caps up cause ESR to
> lower?
 
Probably, but why even bother to check ? If your ESR meter says it's bad at
room temperature, then it's bad, end of ... Not having had any sound for
five years doesn't help with remote NG diagnosis, as it's quite an important
indicator as to what exactly is and isn't working when it's wrong
 
Arfa
amdx <nojunk@knology.net>: Aug 21 08:36AM -0500

On 8/21/2015 3:22 AM, N_Cook wrote:
 
> Butchery autopsy report on the Tx?
> Bifilar wound hotspot at the most insulation-stressed point? blown
> thermal fuse? failed PbF coilwire/tail joint?
 
I once had a Pb coilwire/tail joint fail from over heat on a two HP
motor. Kinda ticked at myself, I disassembled all the windings figuring
I'd rewind it, never did. The joint was 8-#18 wires connected to
a #2 or #3 cable. (Military motor, 28V)
I didn't know the term "coilwire/tail joint fail" at the time. :-)
It powered my gokart, took a few years until it got tired of those
250 amp to 300 amp currents from a standing start.
Mikek
 
Mikek
 
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