More likely to be R64 on the diagram as it matches the 33K value measured on the board but there is obviously some difference between the circuit diagram we have access to and the actual unit as the resistor we are changing seems to be labelled R52. You are correct in saying that R52 on the diagram would not change DVDD as that is concerned with transient response of the circuit.
The pins SET0 to SET3 look as thought they give some software selectable voltages but the highest resistor value there is 36K so that is not of great use unfortunately.

Profit and Loss

Looking at my Gridseeds and wondering if I should mod the hardware, and if so by how much, it seemed to me that the alarming increase in power usage as clock speed increases might have undesirable effects on the profitability. So I decided to get out my calculator. The results below are based on some tests performed by myself on the latest version of the Gridseed 5 chip module (the one with surface mount LED's). I modified one by changing R52 to 39k and another by changing R52 to 47K. The modules all had the 5V fan mod and were clocked at 850MHz, 1000MHz and 1200MHz, these values were chosen as the maximum which gave zero (or close to it) errors. The power cost is calculated from what I pay at about $0.20/KWHour and the modules using 4W, 15W and 25W. All figures relate to one Gridseed module running for one day and based on a bitcoin value of $460. Earnings figures are based upon a return of 0.004386 BTC/MHash/day.

R52	Power Cost	Earns Today	Profit Today	Earns Month 2	Profit Month 2	Earns Month 3	Profit Month 3
33k(standard)	$0.019	$0.72	$0.701	$0.36	$0.341	$0.18	$0.161
39k	$0.072	$0.857	$0.785	$0.4285	$0.3565	$0.21425	$0.14225
47k	$0.12	$1.029	$0.909	$0.5145	$0.3945	$0.25725	$0.13725

So assuming that the income from mining halves each month (seems likely it will) we can see that in just 2 or 3 months time it will be best to have unmodified Gridseeds.
I must emphasise that these figures are far from definitive and should only be viewed as a rough estimate. Your modules might give different results and your power cost is probably different from mine.
Overall I think my best bet is to leave mine standard with no fans at all rather than go to all the trouble of modding them only to have to put them back in a month or two.

Nice work

Cant imagine that solder paint will help though. Try a piece of very thin fuse wire a couple of inches long so you can hold it easy. Tack it on to the 2 contacts then break off the excess by bending back and forth or use a small blade to cut it.

How many is a few? I would like to order some more.

The fan in the gridseed only connects across the 12V supply so just unsolder or cut off close to the board. Should you want to refit the fan later you can just connect it to 12V (or 5V for a slower fan), no need to connect it internally again.

I am running 10 gridseeds on a raspberry pi using cgminer with the cheapest 10 port hub I could find on ebay (about $6 new) and they run sweetly

I have a 5V 8 amp power unit driving the hub and pi. Not sure if it needs 8 amps but I had it already.

You don't need the fan at all for scrypt only.

Your front page of this thread says 10 units for £1300 but I cant seem to get that rate on the website, only £1400 and that comes up as out of stock. Will it be changed soon?

Darkfriend did you see my reservation PM?

Would shipping from CH to UK bring any VAT or duty extras to be paid? Anyone bought in the UK yet?

2.1mm plugs do fit and I would say they are better really as a slightly tighter fit is a good thing. I would strongly advise against using those octopus cables though as the wires in them are so thin its a joke. Definitely useless for BTC mode and not even good for LTC only mode as even if they dont get hot you dont need any extra impedance to increase power line noise.

How do I know I can trust you? You have only been registered here since 26th Feb and you have made 238 posts already? That seems a huge amount of activity.

One enclosure option

I crammed my 10 gridseeds into a PC mid-tower case like this -



Seemed like quite a lot of work though 

The 10 port hub I used was the cheapest I could find on ebay, ablout $6 (without power unit). I had a 5V 8A power unit laying about (bit of an overkill) so I used that to power the hub and raspberry. All seems to work well.

On the front I have just a mains on/off switch and one of the flap type cd blanking plates so that I can pull the flap down to get access to the raspi SD card if I need to.

How to get Scripta working as it was intended

Follow the instructions by Darkfriend77 below but when you get to step 6, go to directory opt/minepeon/bin and remove the original cgminer there (rm cgminer). Now copy the new cgminer into this folder to replace the original and chmod it as below.
Now go to directory opt/minepeon/startup and edit the file miner-start.sh with nano.
Change the line -
to
Lastly apply the stability fix.
Now you can close ssh and restart your pi and it should automatically fire up your gridseeds and start mining.

I got one of those and cut it up but the wires in it are absurdly thin. Obviously video cameras use very little power. I just binned it. Even if the wires dont get very hot there will be an impedance there which will increase noise. Not good.

I hope it never does but I have only got a 100W power supply driving 10 of them so I expect the supply would just die if BTC mode turned on.

I just removed the fans completely, no need for them with LTC and I wont be using BTC mode.

At 800MHz clock I get maybe 2 errors in 24 hours. Higher clock rates produce more errors and although cgminer reports higher hashing speeds the speed seen by the pool goes down. I think 850 might be the optimum but I need more testing.

Oh the luxury of having cgminer working Thank you Cryptomining.

Now I can have CGWatcher and CGRemote on it too )

Not sure if this is old news but I removed the fan from one of mine today and in still air running LTC at 850MHz it gets barely warm. I think will go ahead and build them into a case with just a small fan pushing air out of the back.