So I'm looking to dump my BCH for a few more BTC.

Although I peruse the forum regularly for interesting info I haven't really messed with altcoins or exchanges since the Gox days.

Are there any exchanges that allow trading of BCH -> BTC without needing to fill out tons of info or bank verification crap?

Thanks dudes

A net launcher would be the cheapest and most legal way I could see taking down a drone you want to get rid of. Even if you don't launch a net, something like a big clump of string would tangle the rotors and bring it down.

Talk about complete FUD garbage, this is part of how the whole system works. If we never actually bump up against transaction limits you never really have true fees. This won't be able to support the network as new coin supply drops if everything continues the way it has been.

Yeah looks like they spun their own version after the C1. Sounds like they went to an onboard flash chip like the retail BBB so you'd have an OS flash procedure like you'd do for installing onto internal flash on a retail version. Of course you'll still need the image - why they haven't provided an image for the S7 yet is not good.

The OS and all config is on the SD card so you'd need to either keep the original one shipped with the miner and put it in the new BBB or get a new one and flash it with the S7 firmware image.

They are cost reduced by not populating some chips and connectors, but a standard BBB should work. (pic of a C1 - can anyone confirm if the new ones are different?)

You would need to open the PSU and find the protection chip. Open the datasheet and see if you can find a way to disable only the voltage protection. This may involve lifting pins, adding wires or removing components.  Disabling the chip entirely would be a massively bad idea for obvious reasons. I don't recommend it either way.

The PSU has this feature for a reason; if it's tripping out now, bypassing it may result in catastrophic failure of the psu with a good chance of fire.

You are most likely triggering the overvoltage protection circuit in the PSU. Not all supplies may have that feature. You must be very careful running PSUs on 277v as most power supplies use 400vdc rated input filtering capacitors and rectified 277vac has peak voltages of ~390vdc. Cheap PSUs may have lower rated caps that may leak or explode if run continuously on 277v especially if your line voltage is on the hotter side of 277.

Short of upgrading filter capacitors and disabling the OVP circuit there isn't a way to properly run them directly on 277v. (you probably don't want to do that)

Best way would be to get a transformer with taps that will get you down to 240v

When you say "Usb port is not recognizable although the win 7 pc i have found it as serial converter." do you mean it comes up as a usb serial converter or is windows saying the usb device was not recognized? I do know several people have had issues with the FTDI usb->TTL uart chip dying.

Sounds like everything else is working from your descriptions. The LED should blink when power is turned on, then blink fast a few times and go solid light. That means the hashing ASICs have passed the self test.

So they ripped off the hardware design of the Trezor, put a different connector/enclosure on and think it's okay to get a free ride on the hard work that has been done by Slush's team to write the firmware?

You'd be amazed at how little flow you really need for most water cooling systems. Although Bitmain chose fairly small hose ports, the blocks are not crazy restrictive (and if they were, it would be a bad design) plus 2 meters of head is pretty good for a small pump. It takes a lot of energy to heat water significantly during the 3-4 seconds it spends in the C1 water blocks before it heads back to the radiator.

Here's a screenshot of the current temps of my C1 and it's not that cold in my basement, approximately 60F (15.5C)



Picture of flow obtained with the little pump

It's rather amazing how poor quality those pumps are, I've been keeping my C1 cool with one of these little guys http://www.ebay.com/itm/12V-DC-CPU-Cooling-CAR-Brushless-Water-Oil-Pump-Waterproof-Submersible-AP-/121458053302?pt=LH_DefaultDomain_0&hash=item1c4776d0b6

$6, no problems at all.

0725, that was the default for the image I used, haven't had any X on the ASICs

I've had mine beep during the original setup - the buzzer is on the FPGA board the BBB plugs into. If you have backup pools enabled and you still get beeping your internet connection or router probably sucks.

Seems like as long as the SD card is good, the C1 is a very reliable miner. I had some issues with mine on startup but wiping the SD card and uploading Dogie's original disk image got me up and running.

Anyone have better uptime yet?

My main concern with the S5 is why does it cost so much?

The C1 is $325 and has FOUR hashing boards. The C1 boards also have a DC/DC converter for every two chips IIRC. The buck controller ICs probably cost more per unit than their custom silicon.

There is a major BOM cost reduction going to the chained design. The controller looks the same (cost reduced beaglebone black), the new chips of course have an NRE that needs to be recouped so they're probably just milking the first batch of people who are gonna buy it just because it's new.

Not even considering the possibility of instability or catastrophic failure due to the chain design, I'm gonna sit on my hands for a while. I'm willing to bet the first few price drops will be pretty good.

At 10GH/s, a quick calculations says you will earn 0.00382609 BTC per month, or about $1.30usd at current prices. It may very well take you a few days to get your account credited.

Also the pool needs to find blocks before anyone gets paid. Sometimes there can be a good portion of time where no blocks are found (bad luck)

It's a male PCI-E power connector, it would go in one of the unused ports on the miner to pull power back out to run the fans/pump.
I'm running my C1 with just four PCI-E connectors and they don't really get warm (~180W each)

Those numbers sound a bit off, 120mm fans drawing 2A each would be in the class of Delta screamers that can hover if placed face down on a table. 0.2A sounds far more likely than 2A. The pump using 2A is more likely as you have a significantly heavier working fluid and I think those pumps push upwards of 2m of head.

I doubt the whole string draws more than 3-4A @ 12vdc

Common PC water cooling systems use a metal radiator to dissipate heat into the air, it's the same as a normal heatsink but you're using water to move the heat away from the source instead metal conduction directly to the dissipation surface.


Evaporative cooling makes use of the fact that it takes something like 970BTU to evaporate 1lb of water. If you have a large surface area covered with water and blow a fan over it, you get sensible temperature reduction from the energy taken to evaporate some of the water. It's much more efficient than a normal air conditioner but they don't get used much for air conditioning normally because it dumps a crapload of humidity in the air. Miners don't care so it can be an advantage.

Also evaporative cooling effectiveness is inversely proportional to the humidity of the outside air. If it's already humid as shit outside, you don't get much gain with an evaporative cooler. In the desert, they work great