Digest for sci.electronics.repair@googlegroups.com - 8 updates in 5 topics

Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Feb 10 10:54AM -0500

On 02/09/2017 04:13 PM, AlexPelocho wrote:
> I was once told: If you can accept that a moving electron produces a
> magnetic field, you become an engineer. If not, you become a
> physicist. I am the former with the inquisitiveness of the latter.
 
Well, whoever told you that wasn't a physicist, I suppose. ;)
 
Cheers
 
Phil Hobbs
 
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
 
160 North State Road #203
Briarcliff Manor NY 10510
 
hobbs at electrooptical dot net
http://electrooptical.net
Tzortzakakis Dimitrios <noone@nospam.com>: Feb 10 03:35PM +0200

On 10/2/2017 7:52 πμ, Michael Moroney wrote:
>>> the ground.
 
>> Ouch! I've seen this happen before too. Doesn't typically end well for
>> the building and/or the electrical system/attached devices inside.
Here in Iraklion,Crete MV used to be 15kV, now it's 20 kV I think.
Usually we don't have accidents of the primary messing with the
secondary. MV distribution is all around the city with buried cables,
some of them are very old, with paper insulation. However, there was a
bad accident where a lineman was connecting a new supermaket to a 20kV
circuit, there were two buried cables, and they have a special device
that checks if the cable is live. So he checked and it wasn't. But back
at the substation they energized it and the arc flash instantly killed
him, and temporary blinding everyone at the vicinity.And in the
Thessaloniki substation, a potential transformer exploded (400 kV) and
the debris destroyed an auto transformer (400/150 kV) and there were
serious problems with power for the whole area. I have a surge power
strip on my computer and when I turn my PC off I throw both the PSU
switch and the power strip one. On my stereo I have a voltage regulator
and when off I throw the VR's switch, the power strip's and the amp's.
That should be enough. If there's an 20kV surge the PC and the stereo
would be the least of my worries.
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Feb 10 10:48AM -0500

On 02/10/2017 12:52 AM, Michael Moroney wrote:
> regulator transformer on a nearby old circuit reads 2400V which seems kind
> of low. The utility seems to have been upgrading other older/lower voltage
> circuits in the area as well.
 
In my neighbourhood the top line is usually 1600V, with one or a few
pole pigs per block to make 120-0-120V. Of course we're about half a
mile from the substation.
 
Cheers
 
Phil Hobbs
 
 
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
 
160 North State Road #203
Briarcliff Manor NY 10510
 
hobbs at electrooptical dot net
http://electrooptical.net
mhooker32@gmail.com: Feb 10 06:16AM -0800


> any help most welcome
> thanks
> mike
 
never found docs for it, but figured out its an atom processor and used docs from another board to figure out the jumpers. got into the bios and now all is well.
thanks
"Mr. Man-wai Chang" <toylet.toylet@gmail.com>: Feb 10 11:30PM +0800


> never found docs for it, but figured out ....
 
Check its website:
 
https://www.asus.com/Motherboards/AT3IONTI/
 
--
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"Mr. Man-wai Chang" <toylet.toylet@gmail.com>: Feb 10 11:31PM +0800

> doesnt boot up, nothing on screen. cmos battery was stone dead, replaced. doesnt even get a bios screen, nothing. this one has an azus AT31ont-1 board, 1 gig ram. it has a flash drive for operating system. with or without the drive in it, i get nothing. the power supply also doesnt turn on. you do get a little blue led on the motherboard, but no PS fan, no 5,12 volts. i now have it on the bench with an ATX power supply jumpered to always turn on,and a vga monitor. blue led is lit , 5, and 12 volts are present, and still get nothing. documentation seems to be non existant, i cant find anything. its from a video game, and im sure the bios was set to power up when the 110v switch is turned on. there must be a way to use an "on" switch like a pc, to get it into the bios screen, but i havent a clue what to jumper.
 
Cross-posting your post to alt.comp.hardware.pc-homebuilt!
 
 
--
@~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!!
/ v \ Simplicity is Beauty!
/( _ )\ May the Force and farces be with you!
^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
N_Cook <diverse@tcp.co.uk>: Feb 10 02:50PM

Replaced earth trace with an earth wire, tiny DPDT 8A relay replaced
with 2 SPST 15A relays stacked on top of each other. So far so good ,
stable -80.0,80V rails , mV output, red ->green-> no protect LED
sequence at power up . Cannot sensibly check audio until that rat's nest
is complete. Just as well took pics, as had not realised black wires
were for Dc gnd, plum for -ve and red for +ve
"pfjw@aol.com" <pfjw@aol.com>: Feb 10 05:46AM -0800

On Friday, February 10, 2017 at 7:43:18 AM UTC-5, Phil Allison wrote:
 
> No-one needs to see your brain dead, autistic crap.
 
> .... Phil
 
 
Off your meds again?
 
Fluke 73III True RMS meter. Set to ohms. Cross leads. Hold Down Yellow (range) Button. Meter adjusts to 0 ohms. Proceed from there. I have been using this meter for almost 20 years now, and go through this when either switching leads or changing the battery, or if it has been sitting for a while.
 
I guess quality equipment (along with quality meds) is not available in your cave?
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