Reserved for technical notes:
1) I have managed to port the KNC code for the Titan to the Beaglebone. The link is over at Bitcointalk, free download, just donate something or mine to my address for a week as thanks. This was a bitch on wheels to get working.
2) If fire is pouring out of your miner like molten lava through a jungle village you might have run the DC-DC supplies a bit too hot and set fire to the capacitors. Replace them with 22-24uf caps and try to keep the DC-DC temps below 60c or so. Given the lack of airflow over them and that weird-ass insulated blanket thing on top of them, that would be a good idea.
I can fix this.
3) I've been able to get many blown boards up to what I would consider to be full power (600gh, <300 watts) not too bad. Do have to trim a bit since one of the power supplies runs a tad bit hotter, and the other unit is currently cooled by a water block. Weird.
4) If you're nutty enough to overvolt/overclock your Neptune or Titan here is a very important tip: NEVER MOVE IT WHILE RUNNING OR HOT. Power it off, wait 15 minutes for it to cool, then move it around. Why? Because the chip can get so hot it is softening the solder underneath it. Moving it with that huge heat sink can squish the solder into short-ville. Bye bye unit.
5) Never plug or unplug the molex thing from a running power supply. Always power off the supply then plug it in or unplug it. Why? Because all the caps on the power supplies will cause a powered molex to SPARK and damage the plug. Then it overheats and you feel the burn.... If you see your molex plug is discolored, has burned pins, or is a charred hunk of wreckage, drop me a line:
I can fix this.
6) If you have blown Neptunes or Titans and want me to look at them, let me know. Getting pretty good at this, I can now fix shorted Titans and Neptunes that don't talk to the controller. Rates are reasonable in bitcoin
7) If you think your beaglebone is screwed, check the bottom of the board while powering on. The left LED should come on then the right LEDs should flash in a nice little show. No right lights, no booting. If they don't boot try re-installing the KNC firmware. If that doesn't work reflash it with a stock debian build then re-install the KNC firmware.
I can fix this.
Cool I did have one BB that would not come up but made a high pitched whine on power up. Turns out putting a micro-SD card cleared this and allowed boot. Turns out DPO (dreaded previous owner) must have picked up the board and pressed down on the SD interface pins, bending one to short power to ground. Don't do that
9) Both Titans and Neptunes seem to have "islands of stability" in terms of frequency and voltage. For example 350/450/450/450 at -.3v will yield a solid 600gh, but backing down to a 200/450/450/450 will cause the first pair of supplies to stop putting in current. Weird, but happens on several cubes and several controllers so this is not a fluke.
Run your Titans at 250mhz per die max. Really, the diff between 60 and 80mh is where the death zone is.
10) Never unplug the 10 pin connector from the controller or cube while power is applied. Always shut everything down. When plugging in the cables make sure they are on top of all 10 pins in the Titan and oriented properly. Doing this wrong blows up the cube and controller and yes, I can fix this
11) Always be careful when plugging in the 10 pin cable. Do it with the miner off, and make sure the connector is seated on all 10 pins, it's easy to only get 5 of them and it blows up the miner and controller (which I can fix.)
More to come. Donations of parts and junk welcome.