gridsad
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Activity: 7
Merit: 0
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June 10, 2014, 05:14:07 AM |
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I managed to give a blade artificial breathing . pictures of Frankenblade soon.
anxious await pics of frankenblade! and any others of your creations, would be very helpful. |
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J4bberwock (OP)
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June 10, 2014, 07:03:04 AM |
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I managed to give a blade artificial breathing . pictures of Frankenblade soon.
anxious await pics of frankenblade! and any others of your creations, would be very helpful. Last tryout in a few days will be 120A 2v external powerboard to try and reach 4MH/s on one PCB as a proof on concept. Actually, wires from the pods to the blade are quite hot when using dual pods with 56k resistors to power the blade. Only 1.4v stable instead of 2v on the pods. Blade pcb hashing 3.1MH/s 70/80 watt used Single pod 49.9k was stable around 1v and not hot, blade pcb hashing 2MH/s. |
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DarkKnight
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June 10, 2014, 10:06:21 PM |
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It was 43k stable for weeks, main fan failed during the night.
The ferrites aren't the direct culprit. the upper gate mosfet fails, shorting gate to drain, causing the ferrite to blow, if I'm not mistaken.
It also happens on the pods from time to time, so it shouldn't be the load.
upper gate mosfets should have been doubled as we can see on the initial schematic, but it saves a few $$ when manufacturing.
I suspect that with summer temperature, we will see much more blown mosfets on pods especially those overclocked with 5v fan mod.
When T° rises, the efficiency of the mosfets drops, causing more heat to be dissipated, causing the mosfet to short itself.
Do you have any CFM specs for the fan? Seems prudent to replace it with a better model before it fails. How has the choke held out on your board? On my blades, the choke is getting pretty warm alongside the mosfets. |
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WheresWaldo
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June 11, 2014, 06:04:04 AM |
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Will anyone possibly link some of the parts you purchased to volt mod your g-blades in this thread?
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natbyte
Member
Offline
Activity: 70
Merit: 10
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June 11, 2014, 07:26:56 AM |
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The stock fan is rated at 60 CFM on the blades.
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DarkKnight
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June 11, 2014, 08:19:13 PM |
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I just got a new blade in today, and the board design has changed again. They added solder pads in for a 4th mosfet, but no chip, and added a 2nd red LED that seems to just come on with 12v. Maybe some headroom can be had by adding in the missing mosfet. Seems odd that they would redesign the board with that pad, but then not actually solder one in.
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Blisk
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June 11, 2014, 08:45:32 PM |
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I just got a new blade in today, and the board design has changed again. They added solder pads in for a 4th mosfet, but no chip, and added a 2nd red LED that seems to just come on with 12v. Maybe some headroom can be had by adding in the missing mosfet. Seems odd that they would redesign the board with that pad, but then not actually solder one in.
post some pictures |
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WheresWaldo
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June 11, 2014, 11:09:04 PM |
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I just got a new blade in today, and the board design has changed again. They added solder pads in for a 4th mosfet, but no chip, and added a 2nd red LED that seems to just come on with 12v. Maybe some headroom can be had by adding in the missing mosfet. Seems odd that they would redesign the board with that pad, but then not actually solder one in.
post some pictures agreed! |
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DarkKnight
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June 12, 2014, 03:08:48 PM |
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As Requested:   |
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Blisk
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June 12, 2014, 03:18:53 PM |
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Q9 is added but it is not there
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J4bberwock (OP)
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June 12, 2014, 03:24:10 PM |
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As Requested: Looks like they are reading the thread and adjusting the product. Not that bad. Can I have some royalties for proposing the second upper gate mosfet?  Back on topic, if you solder a second mosfet for upper gate, it will divide the load, and they will both run cooler, less risks of damaging the power board. They also added "J1". Is it power related? can it be a place to solder something better than the original 12V plug? Next improvement would be to move the "AL2" choke slightly out so that the power mosfets could benefit of the air flow from the fan. Almost nothing to do, but it will increase reliability. With so much improvements made, it's clear that the blade wasn't a finished product when they launched it It would be nice if Gridseed could replace under warranty the blades that were damaged because of ferrite beads and upper gate mosfets blown. Even simply exchanging the PCB that you will put back on the heatsink, it will save on shipping for the customer and Gridseed. Gridseed people, if you do read me... |
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DarkKnight
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June 12, 2014, 07:48:04 PM
Last edit: June 12, 2014, 08:10:06 PM by DarkKnight |
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They also added "J1".
Is it power related? can it be a place to solder something better than the original 12V plug?
I checked it, and it's got (2) +12v terminals. It's in the shape of a 4 pin mini 12v aux connector. You see it on the bottom left on this board here just behind the power jack:  It doesn't need to be either or, using both will divide the load, but I bet it will hold on it's own. The new connector might be so they can integrate multiple blades in a larger product. It's locking, so it would be more reliable than a 2.5mm power plug. Also, based on the sticker that was on my other blade, these were manufactured this past week. |
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Decagrog
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June 13, 2014, 05:27:50 AM |
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As Requested: The 4th mosfet pad have the lines connected or is just placed on the pcb? |
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J4bberwock (OP)
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June 13, 2014, 06:59:31 AM |
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It doesn't need to be either or, using both will divide the load, but I bet it will hold on it's own. The new connector might be so they can integrate multiple blades in a larger product. It's locking, so it would be more reliable than a 2.5mm power plug.
Also, based on the sticker that was on my other blade, these were manufactured this past week.
It makes sense, Blade will be entry level around 350-400$ in a few weeks, big blade with more PCB slightly more expensive, probably around 1000-1500$ and A2 for the most powerful miners from 2500 to 5000$. |
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WheresWaldo
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June 13, 2014, 09:12:37 AM |
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Will anyone possibly link some of the parts you purchased to volt mod your g-blades in this thread?
Curious |
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J4bberwock (OP)
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June 13, 2014, 10:36:49 AM |
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Will anyone possibly link some of the parts you purchased to volt mod your g-blades in this thread?
Curious I'll do it this afternoon when I'll go on the computer. Too hard to do with the phone. |
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J4bberwock (OP)
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June 13, 2014, 01:58:54 PM |
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Just to tease you
New topic soon for first overclocked Zeus miner.
I received my miners 1 hour ago, first one already modded.
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ZiG
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June 13, 2014, 03:48:47 PM |
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Just to tease you
New topic soon for first overclocked Zeus miner.
I received my miners 1 hour ago, first one already modded.
Did you find ANY schematics for Zeus...? ZiG |
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J4bberwock (OP)
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June 13, 2014, 05:24:13 PM |
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Just to tease you
New topic soon for first overclocked Zeus miner.
I received my miners 1 hour ago, first one already modded.
Did you find ANY schematics for Zeus...? ZiG No schematics, No chips datasheet. But it does hash at Ltc clock 525 right now with low HW errors compared to what you get stock. Something around 4%. Cgminer 3.1 reports strange hashrate so I'll need to rely on a pool to estimate the gain. Bfgminer gives me way more HW errors No matter what I try. Just an hint on the voltmod, Zeus uses tps40193 as Buck controler. 2R030 power mosfet Reference resistor is 9.3k voltage adjust resistor is 9.1k to get 1.2v 6.2k adjust resistor gives 1.65v on mine. Unfortunately, the cooling on the blizzard/fury is not enough, maybe even at stock voltage. That is the reason for higher HW errors. |
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