Topic: Swedish ASIC miner company kncminer.com - page 17. (Read 3049511 times)

a little bit unrelated but, nice furniture! What kind of wood is this?

Here is my new platinum dual 2560w Server PSU hack for anyone interested using a KNC Jupiter case. Figured what the heck had to zip tie it all together anyway. Doing so
with the KNC Jupiter case luggable/portable kinda sorta it may be made sense.

thread I started on this hack below

https://bitcointalksearch.org/topic/m.15533861

Complete build pics of he process are below.

lostgonzo.imgur.com

sample pic below so you get the idea



Anyway 2x the power of a Corsair 1200i platinum PSU for the same price and platinum efficiency. Well it works great.

Anyway looking for a psu server hack and info check out the above links.

enjoy!

EMC2 and GAME were very briefly during the recent pump

Ja. a Prime example of nice IBM 4kw PSU feeding several (s7) miners without individual protection of the loads. One hasboard shorted and... https://bitcointalksearch.org/topic/m.15478949
The full gory pics https://bitcointalksearch.org/topic/beware-bitmain-s7s9-failures-and-lack-of-warranty-1540037 Just skip the diatribe...

You too? I normally work in the 300-1000amp range at around 300v DC, but I see the same failures in the mining world: Namely

NEVER SUPPLY MORE CURRENT THAN THE SMALLEST COMPONENT CAN HANDLE. IF YOU DO, FUSE THAT PORTION OF THE LINE.

This is why miners explode into flames: The unit may be built for 40 amps input at 12 volts, so not much of a problem when you run it off a 500 watt power supply. If it shorts it crowbars the supply. But what happens if you hook it up to a buss that can supply 5,000 watts (and runs multiple miners). When it shorts that 40a line is dropping 5,000a and it turns into a pretty fireball.

This is why you have a 1a fuse on a capacitor pre-charge circuit; if a cap shorts it fitzes the fuse instead of fireballing the contactor.

This happens with Titans from time to time, I get units in that have a cap short and the supply is fused to the board. Because it was being powered by a honking big supply without a fuse in series. KNC could have put in fuses (some early miners like those block erupter blades did have them) but that would cost an extra buck.....

And if they did that they would have had to put optoisolators on the FPGA outputs and the level converters in the Titan. You know to keep them from blowing the fuck up..... Another buck.



Options when repairing: Insert a 1 or 2a pico fuse to what feeds the RasPi. Quick, cheap and dirty version, use a piece of 30ga wire-wrapping wire perhaps
[/quote]

As I seem you start  again, and will not be able to keep your mouth shut?

Then again  some  of your lies.
1. June 03, 2016, 05:08:05 PM
 2.  12, 2016, 01:34:21 PM 
6.
7.8.
9.
10.


The fact is that you sent it at the same time as the other buyers packages.  End of the Juni.

Fakt is, that is not big package, It is air-mail envelope.

Fakts is, that this air-mail envelope  is send out from Canada with a tracing number.

The fact is that I can  prove all that.  .

 The only proper sentence from you:

Well thank god you'll shutup about it now. Though don't assume you're the largest buyer of my "goods". I don't only sell those bridge boards. But it was hell dealing with you as a customer. So there's that.

A KNC mine shutdown might fit this scenario real well. Usually when a company enter "liquidation" from Bankruptcy, somebody is tasked with selling off the assets. A bunch of mining gear is a ready asset to be sold, but has to be shutdown and made ready for sale. Depending on who (and when) buys them, it might come back over time assuming LTC is profitable.

This kind of liquidation process could easily happen, even if the mine is operating at a solid profit. The liquidators job is to produce cash (i.e. fiat) NOW, to pay off creditors and such. 

Yeah, ~500GH/s worth of power is gone. Is another scrypt coin suddenly crazy profitable? Or maybe the rest of KNCs mine has been shutdown?

Looks like Titan owners or somebody have moved away from mining LTC now. Next diff change -20% lol

Thanks for the info gents. Good to know !

Yep what I'm doing too...just making NEW Titan Controllers on the cheap. (But then again good to know in case I do have one go out ..about the PI etc)

Who said that we replacing bridgeboards ?

I personally do  new TITAN controllers from Jupiter and Neptune controllers.

Just popping in since power and its distribution is part of my thing... "The thinnest trace in the bridge board" Perhaps KnC's idea of a fusible link vs using a picofuse?

Options when repairing: Insert a 1 or 2a pico fuse to what feeds the RasPi. Quick, cheap and dirty version, use a piece of 30ga wire-wrapping wire perhaps

My theory is this:

The power supply +5v line supplies the Rpi through the bridgeboard. If the Rpi shorts itself out somehow it puts the whole +5v line under a dead short. With our power supplies being big and all, that causes the smallest wire trace to blow first, in this case the bridgeboard.

Why are people replacing bridgeboards ? Under what circumstances and in what way do they fail ?

Micro thought: If your previous board blew please check your Rpi for shorts before plugging the new board. If the Rpi is shorted your happy 700 watt power supply will happily try to feed 700/5=140 amps into the short. That will blow a lot of things.

I test my Rpis that come in with a USB power supply and cable. If the Pi doesn't come up on USB it's probably bad. Never tried using a USB cable as a bypass for a blown bridgeboard, might work actually....

Today, the package arrived in Florida. Of course, with traceable service, according to which it is posted at the same time as the other buyers  packages.

Everyone does their own conclusions .. who lied, and for what reason.

Anyway,  with a seller who writes his largest buyer of goods all this crap, I do not want to have anything to do in the future.

Still have not received anything in Florida.

Just so folk know

my THREE bridge boards from Qberty arrived today..no issues that I can see...have not tested them yet ..will have to wait till the weekend when I have time

but just so folk who haven't got one yet can see some folk have got some