Bitcoin Forum

hi all
got a little problem with my gekko science usb stock miner.
hashes fine at about 8-10 gh/s for between 5 - 15 mins, then just sits there doing nothing (steady green light).
the only way i can get it to hash again is to unplug and replug.
tried on win 7 & win 10.
direct into pc and on dlink powered hub.
using bfg miner.
any help would be greatly appreciated :)
many thanks.

USB 2 or USB 3?

I had this problem if you look in the main gekko thread towards the end.

I found it was the voltage setting on the screw was too high for my ports to handle and reducing it helped.

thanks for the reply
using usb2
where is the voltage screw please, and which way to turn it (anticlockwise, i'd guess??)

https://ip.bitcointalk.org/?u=http%3A%2F%2Fs11.postimg.org%2F65w217gnn%2Fcompac_cgminer_pot.jpg&t=560&c=ntYV0y0C9LMU3g


Yes turn it anti-clockwise.. make sure it doesnt go past the 6pm mark or 12 pm depending which  way you hold it.. As i think that will increase it again.

You will have to decrease your clock rate too or you will get hardware errors with the lower voltage.

I set a clock speed like 150 and with it mining slowly turned the screw anticlockwise.. Noticing when the HW errors started then turned it back up slightly.. It will give you a ball park area that way.

many thanks :)
turned the screw just a fraction and seems to be working fine at the moment :)
not seen any hardware errors as yet, but if i do, how do i adjust the clock rate ??

someone please give him   a bat file  with a few freq settings.

I would do it but I am not running bfg miner.


on the volts adjustments   if     the  pot is like this +     top at 12 just move it 1 hour to 11 to lower or 1 hour to 1 to raise.

then do a new test for a bit.

usb2 ports can do freq 200 on most setups.

Add "--compac-freq 200" to the command line at some point. You can try 150 or whatever. I have a Y splitter so i'm not sure when you should stop cranking it up.

I think that is command with cgminer not bfgminer.  I think it is more "--set compac:clock=x0b83"   In later versions it allows freq no instead of that, but not sure what version of bfgminer

bfgminer:

./bfgminer -o stratum+tcp://stratum.mining.eligius.st:3334 -O 1BURGERAXHH6Yi6LRybRJK7ybEm5m5HwTr --set compac:clock=x0b83
---------------------------------------------------------------------------------------------------------------

Note that for bfgminer you have to use the hex value for a given clock rate, whereas for cgminer you specify the clock rate in MHz.
A table of values to use in BFGminer is as follows:
        { 100,          0x0783 },
        { 106.25,       0x0803 },
        { 112.5,        0x0883 },
        { 118.75,       0x0903 },
        { 125,          0x0983 },
        { 131.25,       0x0a03 },
        { 137.5,        0x0a83 },
        { 143.75,       0x1687 },
        { 150,          0x0b83 },
        { 156.25,       0x0c03 },
        { 162.5,        0x0c83 },
        { 168.75,       0x1a87 },
        { 175,          0x0d83 },
        { 181.25,       0x0e83 },
        { 193.75,       0x0f03 },
        { 196.88,       0x1f07 },
        { 200,          0x0782 },
    .... https://bitcointalk.org/index.php?topic=1173963

Thanks for linking the support thread, since all this information exists there already. Search functions work.

Your welcome I did not want to take credit since was all right out of your thread.     For others with compacs I really do suggest reading sidehacks thread on support.   It has a lot of good info right on page 1, that was where all this came from.

I'm did not mention OP with using windows it will be "bfgminer.exe" at start instead of "./bfgminer" as that is the linux side.   You might think about a RPI to run them it does it with very little power being used.