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Showing 20 of 446 results by Photon939
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Topic
(Unknown Title)
by
Photon939
on 25/01/2020, 02:27:00 UTC
These BF1 miners are pretty sweet, would take over 30 block erupter USBs to equal what I have in this pic





And the whole system
Post
Topic
(Unknown Title)
by
Photon939
on 25/01/2020, 02:27:00 UTC
What usb hub are you using?

I'm using this cheapo chinese hub that I bought here - http://www.ebay.com/itm/251342525547?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

It requires some modifications for USB miner use though, see my post in this thread - https://bitcointalk.org/index.php?topic=253749.540
Post
Topic
(Unknown Title)
by
Photon939
on 25/01/2020, 02:26:00 UTC
Neat Idea, I hope that isn't olive/vegetable/canola oil, it seems very green
Post
Topic
(Unknown Title)
by
Photon939
on 25/01/2020, 02:26:00 UTC
Neat Idea, I hope that isn't olive/vegetable/canola oil, it seems very green

That's kind of the cameras fault. Its actually a very yellow/orange color. It's a generic cheap knock-off lubricating oil for vacuum pumps, not sure what it is derived from. I have a feeling its a silicone oil. The BE survived overnight so I'm happy.

Should be fine then, just an FYI most drug stores sell clear mineral oil as a laxative. I've used it before to insulate an extremely high voltage transformer. Cashier might give you weird looks though when you go buy like ten bottles of it  Grin
Post
Topic
(Unknown Title)
by
Photon939
on 25/01/2020, 02:25:00 UTC
I got a very long awaited package from the postman today - figured it was a good time to do some tidying.

Hashrate++
Mess--

Now everything is running from a PSU that I had purchased for my GPU bitcoin mining rigs 2 years ago. Saves 5 watts over running them from the original power bricks. Also adds active PFC.



Post
Topic
(Unknown Title)
by
Photon939
on 25/01/2020, 02:25:00 UTC

nice! what is that thingy in the top-middle with the cage?

Is the USB Hub also beeing powered from the big PSU?


Quote

nice! what is that thingy in the top-middle with the cage?


It looks like a (fairly old) variac, which is a variable voltage AC toroidal transformer. They're useful for controlling the power input into simple motors and static-type loads, like heaters. They're also good for blowing up electronics, because they can usually be turned up to give a voltage higher than their mains input.

Indeed it is, it's a 15A Superior Electric Powerstat, probably from the 1960s. It's a beast

And yep, the hub is powered by the ATX psu. I chopped the barrel plug off the original wall wart and soldered it to a 4 pin floppy drive power connector that I desoldered from a floppy drive in my junk pile. The hub has been modified to handle the higher current draw of the block erupters.
Post
Topic
(Unknown Title)
by
Photon939
on 25/01/2020, 02:22:00 UTC
If it makes you feel any better I sold 200 coins at $0.91. Ha! Regret ahoy!
Post
Topic
Board Service Discussion (Altcoins)
Best exchange to dump BCH?
by
Photon939
on 07/08/2017, 15:14:18 UTC
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
Post
Topic
Board Off-topic
Re: Best way to get rid of drones?
by
Photon939
on 10/03/2017, 21:50:44 UTC
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.
Post
Topic
Board Press
Re: [2016-03-02] Bitcoin payments around the world are failing
by
Photon939
on 03/03/2016, 14:39:10 UTC
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.



Post
Topic
Board Hardware
Re: S7 died, keeps hashing with fans on low, S5 burnup all over again?
by
Photon939
on 22/10/2015, 20:21:04 UTC
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.
Post
Topic
Board Hardware
Re: S7 died, keeps hashing with fans on low, S5 burnup all over again?
by
Photon939
on 22/10/2015, 19:05:56 UTC
Awesome that's good to know and does the controller attachment keep all the information or would a replacement need a micro sd with an image on it to run properly?

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.
Post
Topic
Board Hardware
Re: S7 died, keeps hashing with fans on low, S5 burnup all over again?
by
Photon939
on 22/10/2015, 17:03:41 UTC
At least since you have multiple S7 units you can use one BB to run at least two of them.  Even if one of your BB dies you can try to connect all 6 boards to a single BB and run it like that unit Bitmain gets you a new one.
Can a standard BB control the antminer S 7? I thought they were a bit modded.

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?)

Post
Topic
Board Hardware
Re: S4 Power Supplies & 277V
by
Photon939
on 09/09/2015, 14:17:48 UTC
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.
Post
Topic
Board Hardware
Re: S4 Power Supplies & 277V
by
Photon939
on 08/09/2015, 15:56:34 UTC
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
Post
Topic
Board Hardware
Re: BFL labs single 60GHs schematics needed
by
Photon939
on 17/05/2015, 16:35:17 UTC
Hi all,
my single 60GHs is dead and i want to revive it (if possible).
Machine is opening, the blowers runing fully and after gows lower speed.
Usb port is not recognizable although the win 7 pc i have found it as serial converter.
I try to mining with all known miner software like easyminer, bfgminer,cgminer etc.
Nothing happened also.
So i've decided to do some measurements to find a clue.
+1V are exist in both test points and others test points has 1,8V, 3,3V, 5V seems OK.
My last chance to fix it is to take out the eeprom 93LC56, read it and replaced.
Please before i do that if someone has another approach about measurements etc, post it here.
TIA

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.
Post
Topic
Board Marketplace
Re: eWallet (Bitcoin hardware wallet) is now available
by
Photon939
on 16/03/2015, 20:16:42 UTC
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?
Post
Topic
Board Hardware
Re: ANTMINER C1 Discussion and Support Thread
by
Photon939
on 09/01/2015, 23:56:20 UTC
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.



Those are water fountain / fish tank pumps which do work, but have half the pushing power and height as the C1 rated pump. They also have no reservoir, unless you have that pump sitting inside a small bucket of coolant or something?

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.



Those are water fountain / fish tank pumps which do work, but have half the pushing power and height as the C1 rated pump. They also have no reservoir, unless you have that pump sitting inside a small bucket of coolant or something?

From the specs that one is rated around 1/2 of volume pushed.   I would guess it's partially based on ambient temperature.  If OP has very cold ambient it will cool the coolant when in the tube, not just in the radiator.

Personally I would not go this route but I know a few through this thread have.  You would use anything that holds water and is big enough to put it in as a reservoir.  Reservoir's are not really anything special.


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

Post
Topic
Board Hardware
Re: ANTMINER C1 Discussion and Support Thread
by
Photon939
on 08/01/2015, 04:59:48 UTC
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.

Post
Topic
Board Hardware
Re: ANTMINER C1 Discussion and Support Thread
by
Photon939
on 27/12/2014, 03:45:10 UTC
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?



What is your voltage setting? 0760?

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