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Archive for the ‘PCB Design’ Category

Turning USB peripherals BadUSB (A confession……)

08 Aug

There is currently a ‘stink’ about this article:

Turning USB peripherals into BadUSB

These guys appear to have put a quite an amount of research into this subject and attack vector.
However I’m disappointed about how little research and citations of prior work they seem to have included, even if it is not based around USB devices it is still relevant.
Then there is the ‘case’ of the 3rd party publicly available code to reprogram the SAME USB device released BEFORE their presentation.

For Example:
On Hacking MicroSD Cards

Read the rest of this entry »

 

USB miners and the Dipo Electronic 19 port 20A USB Hub

20 Nov

This is a 19 port hub with an integral power supply that is capable of reliably supplying MORE than 700mA per port without overheating or becoming a fire hazard.

Dipo  hub , with engineering modifications for reliability

Dipo hub , with engineering modifications for reliability

Some of the Basic specifications:

– Fully 480mb/s at each port
– 16 Front facing Standard A USB ports
– 3 Side facing Standard A
– 1 Master hub connection Standard B for connection to Computing Equipment or other hubs
– Fully fused internally via multiple poly-fuse resettable fuses both on each individual port and on the main power feed to the Ports.
– UK/European standard 3 pin power plug
– Hub runs COOL

Unlike cheaper USB ports that only implement links at USB 1.0 standard (12mb/s speeds but state they are ‘compatible’ with USB 2.0) this is a professional FULL 480 Mb/s port that complies and implements the full 2.0 USB standard. It may also be used to connect to generic USB 1.0 equipment.

The good thing about these hubs is that you can load them up with 19 Bi-Fury miners (around 76 gh/s) and the miners would STILL run as intended.

The supplier is a Chinese company we have been working with, each hub we sell is inspected both at the electrical and electronic levels to ensure the correct functionality of the product.

It can be purchased here:
Razorfishsolutions.com.hk

 
Comments Off on USB miners and the Dipo Electronic 19 port 20A USB Hub

Posted in Android, Arduino, BITCOIN, forensics, FPGA, Linux, PCB Design, Reverse Engineering

 

Bit coin miner from Ebay scrap The Solar debateVIII)

13 Jul

It was not until the start of this year (2013) that there has been such a long run of exponential increases in the bitcoin difficulty.
Current difficulty is 26162876 with a PPS share rate of 0.00000092 BTC (actually it is lower once you consider fees etc)

After mining for a few years using various systems- CPU, GPU, FPGA.. The time has now come to reconsider the situation….
B.F.L have continually failed to deliver what they promised they were experts in…. Power consumption does not match,shipping does not match, quality does not match.
Back in January, they were saying delivery would be in Two months, they are still claiming that all back orders would be cleared before end of September 2013, personally I find this unlikely since they STILL have not shipped any of my orders, and for them to clear the backlog, they should at least have my orders in ‘production'(I’m in the top quarter of their estimated order book).
Plus the number of people who have had new ASIC kit only for it to fail abysmally is rapidly increasing..
I have decided to give them until the middle of August and then I’m pulling the plug on the orders.

Read the rest of this entry »

 

Bit coin miner from Ebay scrap (VI)

30 Jun

One major issue with generating bitcoins is getting rid of the heat from the crypto hashing engines. This is partially due to poor design of many of the crypto engines, or the incessant need of miners to over-clock the rigs until the errors are in double figures….
However many Bitcoin miners do not take into account the ambient temperature when designing their cooling solutions( and some cooling solutions are just CRAP… blue flashing lights anyone?, radioactive coolant?…. but ..but. is green and it glows in the dark…yep… chicks just dig flashy lights and green coolant.)
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Bitcoin Miner from Ebay Scrap (Part III)

09 Jun

Ok….
A couple of days ago I posted a screen shot of the Ebay Scrap miner pushing 120MH/s

Today I have a screen shot at 150MH/s
Read the rest of this entry »

 

Building a Bitcoin miner from Ebay Scrap, with possible option of litecoin conversion

08 May

SEO

I’m planning to do an article on how to convert Ebay scrap FPGA into bitcoin miners.

Target cost is going to be about $100USD per 200MH/s (cost mostly on the ebay scrap)
so in the case of this…

4 FPA rig..

It would only cost you $400usd!!!!!

Now obviously it is not going to have the same ‘expert’ polish as this top of the line product.. but what do you want for 400 bucks..

Yep I know ASICS are coming soon and that Avalon is already on the market.
This is not a ‘get-rich’ quick scheme
Rather it is a last ditch attempt for people to have a final dabble in bitcoin, before the shit hits the fan and mining becomes impossible for most ‘normal’ people.
Who knows this shit may even sell for $250,000USD in 30 years just like the Apple 1

Litecoin… well lets see what is possible….., but from early experiments it is not cost effective even at $100Us because the KH/s rate is way too low

So if anyone is interested post a comment, maybe even check out the advertisers.

The coins?
Well everyone else does it so I can too…….

 

Xilence PSU really are quite poor quality.

16 Apr

So today I went out and purchased a couple of Xilence PSU (XP500), specifically because they were rated at 30.0A at 3V3.

We needed a fairly strong 3V3 supply rail to feed a couple of maxim buck converters down to 0.98v for an FPGA project.

You would think that 3V3@30A would be able to handle such a simple situation.

Well you would be dead wrong..
After loading the PSU upto 6A the supply rail dropped to 3v1 we then added another 6A load and the rail hit 2V98 Also the 12V rail began to sag down to 11v8 volts and the 5V rail hit 4V8, even with no loading applied to anything other than the 3V3 rail.

Considering these supplies are rated at 3V3@30A, we should not see such poor power degradation with what is basically a 12A loading on the 3V3 rail.

By the time we were at 18A@3v3 the 3v3 rail was below 2v9 and the 12V rail was also in decline.

Furthermore the power supply started to make a sound as if there was a screw loose in the cooling fan, removal of the load caused the sound to disappear.
I’m of the mind that something was breaking down inside the PSU whenever the 3V3 supply was loaded.

OK fine let us contact their support…
After finally getting their support system to accept the email request and supplying the PSU serial number
I STILL have NOT had a reply after 7 Days….

Is the quality of the Xilence PSU bad or is the application unsuitable?
Well, to put this in perspective, I also purchased a really shitty Chinese made ATX-320T PSU that claims it can supply 3v3@14A, this thing cost less than $11USD(I kid you not)
After 4 months at an overload of 18A@3v3 the supply rail on the Chinese PSU has dipped down to 3V2 the 12V rail is at 12V2 and the thing is still as quiet as a whisper, plus no magic blue smoke daemon has appeared.

Recommendation
Do not EVER buy Xilence PSU’s, it may even be better to purchase that shittly little Chinese brand after all.

Conclusion
Xilence PSU’s appear to suck ass so badly that you would NOT want one inside your computer.
By the way their internal build quality on the PSU is basically ‘Fucking abysmal’, parts of the inline filter are ‘flapping about’ in the air as if it was an afterthought needed to pass the EMI standards.
Whilst there may be many Xilence the market, such poor power regulation can only lead to seriously stressed computer parts and early failure of equipment.

Time to return this Xilence crap to the shop and save some serious money.