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Bitcoin / Hardware / Re: [ANN] Sfards: SF3301 sample chip is available [Updated 04/05/15]
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on: May 06, 2015, 08:24:20 PM
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The power boards are probably based on something like tps40140 or ltc3829.
They could have been ordered separately. worst case, they can be used to work on other chips later.
But I expected the power supply to be built in the dev board, and price for the dev board is almost twice what I expected, so sample chips will be fine and more fun.
Anyway, my 2 chips design only needs routing to be finished.
I've been away today and will be driving back home tomorrow (9hours trip at least), so I probably won't update until Wednesday.
Sample chips price is a little bit high too, I expected something closer to 50$ each, but if price for "small batches" is right, it doesn't really matters.
Before I buy 2 or 4 of them, I'll need some more technical informations than what can be found in the partial data sheet.
I'll check tomorrow or Wednesday for what's missing.
Can I assume the chips will be sent express (dhl/FedEx) within 1 or 2 days after payment will be made?
Yes, we will ship (DHL/FedEx) within 48 hours after full payment. Thanks for the confirmation, here are some of my questions regarding the chips: Can we supply non symetrical voltages to body bias? Let's say +0.8v and -1.1v This could be an option to improve a little bit the global efficiency. Also, can you confirm that both pairs are supposed to receive the same voltages? BTC_VDDS0/1 BTC_GNDS0/1 I won't mix voltages, but since there are 2 pairs of pins, it could happen on different designs What do we do with the last chip downstream UART pins? Left open, pulled up/down? Your schematics, with the 4.7k resistors, seems to suggest pulled up, but even the pins in use are shown with the same 4.7k resistor. So it's not really clear which ones do need what. What do you call "internal oscillator" Is it an oscillator built in the SF3301, or does it refer to the on board oscillator? And last one for now: Will you provide the software you used to test the dev board in your github? |
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282
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Bitcoin / Hardware / Re: [ANN] Sfards: SF3301 sample chip is available [Updated 04/05/15]
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on: May 06, 2015, 07:48:24 PM
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....
as from what I have seen the sample chips are usually a lot more expensive then final products.
Only in Bitcoin world. When you look at chips manufacturers sites you will find plenty of "get free sample" buttons. Normally I think samples are cheaper/free if you have proper credentials. Normally I think companies do this so you choose their chip to develop. But I will admit this is not the standard. It looks like they spent quite a bit of time to make a nice dev kit. With low volume I can see why it has a high price tag. But chips I'm a little worried with that being price. Makes me look down the line and wonder what final price will be. Based on gridseed's past history it will be price as high as possible as long as it sells. This thread reminds me of an old school porn movie attempting to go slow to get us excited. The first 20 minutes of the movie is all tease. This took 20 pages to offer any kind of product. I try not to sound jaded like other older members here , but I would be surprised to see it cheap. Secondly if it is cheap bitmaintech will price war the fuck out of them that was done to Sp-tech's sp20 and you know what happened when the price war happen with the two of them coins dropped to under 190 in January 2015. I hope they price it so that is is slightly better or worse then the s-5. Not like the Avalon 4.1 which is far better then the S-5 but cost a shit ton more. If anyone pays more than 400/TH for these when they come out in a month from now they will be complete retards. The diff will definitely double by the end of the summer with all the huge new 16nm clouds coming online soon....i bet stuff will be selling for under 200/TH by the end of the summer. Depending on when the full miners will be available, the 30-40MH of Scrypt @100w for 10 chips will add some value if you look at what is currently available and how it's priced. |
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284
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Bitcoin / Hardware / Re: [ANN] Sfards: SF3301 sample chip is available [Updated 04/05/15]
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on: May 04, 2015, 08:47:48 PM
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The power boards are probably based on something like tps40140 or ltc3829.
They could have been ordered separately. worst case, they can be used to work on other chips later.
But I expected the power supply to be built in the dev board, and price for the dev board is almost twice what I expected, so sample chips will be fine and more fun.
Anyway, my 2 chips design only needs routing to be finished.
I've been away today and will be driving back home tomorrow (9hours trip at least), so I probably won't update until Wednesday.
Sample chips price is a little bit high too, I expected something closer to 50$ each, but if price for "small batches" is right, it doesn't really matters.
Before I buy 2 or 4 of them, I'll need some more technical informations than what can be found in the partial data sheet.
I'll check tomorrow or Wednesday for what's missing.
Can I assume the chips will be sent express (dhl/FedEx) within 1 or 2 days after payment will be made?
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285
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Bitcoin / Hardware / Re: [ANN] Sfards: SF3301 Specifications Revealed [Updated 14/4/15]
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on: May 03, 2015, 06:09:55 PM
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.....
Really neat, but we still don't know if this is at the wall yet?
It's a chip datasheet. "At wall" depends on many factors. DC/DC converter and PSU efficiency. So, if thats not specified all data covers only chip. up to 25% extra power draw is to be expected at the wall with a gold rated PSU, depending on the design: 10-12% for the PSU, and 10-15% for the power converter that will drop your +12v to 0.6-0.9v When using string design, you'll save almost all the loss from the power converter. That's what you can expect from the "24 chips design" they announced at the same time as the 1 chip design. I still believe that 18-20 chips would be a better choice if they go the string design route. If some of you are interested in kicad footprint and library for the SF3301/GC3328 chip, I finished mine a few minutes ago. I'll double check everything tomorrow and share with those interested.   Could you create a Github repo or DropBox folder to share your work ? Do you plan on making your designs available to the community ? Here is a dropbox link with the Kicad footprint and library. https://www.dropbox.com/sh/cjjkrq1fv2u7m0l/AADU4n7cCJsl5N1E6Qtai5M5a?dl=0First trial at dropbox, so I'm not 100% sure it'll work My schematics for a 2 chips board will probably be public. I still need to create a few components to finish it. Summary: BTC side:6 phases buck controller for 200+ amps available Voltage selectable with dip switches from 0.50 to 0.81v (can be unlocked to 1.21v) LTC side:Same power circuit, but with 2-3 phases used Communication interface:USB communication with CP2105/2108 I also kept the ability to daisy-chain boards like in the reference design and a more simple adjustable body bias circuit from +/-0.5v to +/-1.1v |
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288
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Bitcoin / Hardware / Re: Future mining powered by Tesla?
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on: May 02, 2015, 07:50:58 AM
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What DC output voltage are we talking about? It might be interesting to hack power supplies to bypass active PFC and feed high-voltage DC directly into the main switchnodes. That'd give a decent conversion efficiency boost over using AC, especially 120V into KW-grade PSUs.
Voltage 350 – 450 volts so it's probably similar to a pack of 110 li-ion cells serial linked, if you assume 18650 cells @2.2kw I'm not sure I'm understanding what everyone's raving about.
Is this anything more than an expensive battery in a nice case?
it's more or less that, a "nice" battery, but it's "large" and easily available. For those who need batteries for their solar/wind system, they may be something interesting, and easier to setup than the good old heavy lead batteries. I don't know how is the price compared to the lead batteries with deep discharge needed. What I'm more worrying about is the fact that li-ion cell are usually good for 5 years before they slowly die. |
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289
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Bitcoin / Hardware / Re: [ANN] Sfards: SF3301 Specifications Revealed [Updated 14/4/15]
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on: May 02, 2015, 07:38:10 AM
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....
If some of you are interested in kicad footprint and library for the SF3301/GC3328 chip, I finished mine a few minutes ago.
I'll double check everything tomorrow and share with those interested.
What Kicad version are you using? Stable 2013 or newer with library table? good old stable from 2013. |
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290
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Bitcoin / Hardware / Re: [ANN] Sfards: SF3301 Datasheet Open Source [Updated 30/4/15]
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on: May 01, 2015, 10:21:49 PM
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@J4bberwock - is that just a footprint for the chip (or circuitry too)? How many layers did you get that on?
Just the footprint for now, I'll have a look at 1 or 2 chips board this weekend, and if it works well, maybe a 18-20 chips in string design board I don't expect to have it working in less than 4 layers 2oz. 6 layers may be easier/necessary as I like to have large pwr/gnd planes in my boards. |
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291
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Bitcoin / Hardware / Re: [ANN] Sfards: SF3301 Specifications Revealed [Updated 14/4/15]
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on: May 01, 2015, 10:00:57 PM
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.....
Really neat, but we still don't know if this is at the wall yet?
It's a chip datasheet. "At wall" depends on many factors. DC/DC converter and PSU efficiency. So, if thats not specified all data covers only chip. up to 25% extra power draw is to be expected at the wall with a gold rated PSU, depending on the design: 10-12% for the PSU, and 10-15% for the power converter that will drop your +12v to 0.6-0.9v When using string design, you'll save almost all the loss from the power converter. That's what you can expect from the "24 chips design" they announced at the same time as the 1 chip design. I still believe that 18-20 chips would be a better choice if they go the string design route. If some of you are interested in kicad footprint and library for the SF3301/GC3328 chip, I finished mine a few minutes ago. I'll double check everything tomorrow and share with those interested. |
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292
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Bitcoin / Hardware / Re: Future mining powered by Tesla?
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on: May 01, 2015, 09:34:11 PM
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They also have other larger units which may be cheaper that connecting a bunch of 10K units in parallel.
yes, it's the powerpack, but I'm not sure the price/kwh will be much better. the lithium batteries are probably making 80% of the final price. And you are limited to 9x 10kw powerwall linked together acting as one 90kw power source. I'll do a small xls spreadsheet to check how long it'll take to ROI if I'd use one at home to charge during the night (low rate during 8 hours) and discharge during peak rate hours. Don't forget you'll need to buy an inverter to power your house with this powerwall. It's outputing DC current. |
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293
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Bitcoin / Hardware / Re: Future mining powered by Tesla?
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on: May 01, 2015, 08:32:53 PM
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need more details his power pack holds 10kwatt for 8 hours of work
so if you run 4kwatts of miners it should last 14-18 hours. and your sunup is 10 to 14 hours.
very rough estimate would be 1 pack would let you run 4kwatts for 24/7
it cost 3500 usd. not count panels and or install cost. I could not find the warranty.
10 cent power 4 kwatts an hour is 10 cents x 100 = 10 dollars a day or 300 dollars per month or 3600 dollars a year.
Panels last long most everything lasts long. except batteries. if this has a 5 year rock solid warranty
It could work for miners. If the warranty is 2 years I do not think it is good.
it's 10 years warranty, but you probably misread the kwh thing (or I did) it's 10kwh, 2kw continuous, 3.3kw peak, so 2kw for 5 hours http://www.teslamotors.com/powerwall |
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294
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Bitcoin / Hardware / Re: Future mining powered by Tesla?
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on: May 01, 2015, 08:31:00 PM
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It's probably not a great improvement if you already have some solar powered miners.
And if you don't, the only use I can find for it is to take profit of the low rates of electricity to charge the powerwall and power miners from it when you should have paid peak rates.
As for many things, I don't think investing in it for mining purpose alone can give some kind of ROI, but if you plan to use it to power you entire house, running 1000w of miners off it can help getting back some money.
The powerpack should be a better choice for mining, but I believe its cost won't allow any kind of ROI as long as it'll be used for mining purpose only.
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296
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Bitcoin / Hardware / Re: S4 PSU replacement alternative
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on: April 24, 2015, 04:42:31 PM
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Now if you can find a way to fit it inside the box, it would be perfect. Shoe horn maybe?  I'm working on a replacement PSU that will exactly fit the space of the stock one but will allow 1600w draw on 110v. More info once I'll be back from holidays in 10 days. |
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298
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Bitcoin / Hardware / Re: ANTMINER S5: 1155GH(+OverClock Potential), In Stock $0.319/GH & 0.51W/GH
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on: April 24, 2015, 12:07:43 PM
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Does anyone here know what the component labeled "G337 V2" on the Antminer S5 hashboards is? It's a 2-pin package, looks to be built for high current, and is silkscreen labeled C2, C3, etc. There's one in between each pair of ASICs -- i.e., one for each stage in the string, shared by both strings. My best guess is that they are shunt voltage regulators intended to serve as a bypass in case the voltage gets too high (dead ASIC?), but I don't really know. Ideally, if someone at Bitmain could chime in with a link to a datasheet or a part number, that would be ideal. We're investigating an issue on behalf of another miner in which some of them appear to have burned out.
F950G337MAAAQ2 capacitor? Or a similar one, will need to check the exact size, but for specs, it's 4V 330µF |
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299
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Economy / Computer hardware / Re: [WTS] Many SSD for sale 20%
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on: April 22, 2015, 10:11:46 AM
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off 20% when u pay via BTC or XPY
Sure do you accept Paycoin @ 20$ a coin?
No, discount 25% for Paycoin and Bitcoin Domain Create Date:19-Apr-2015 00:35:59 UTC Domain Last Updated Date:19-Apr-2015 00:36:08 UTC  |
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