On Crypto Mining Blog Jabberwock (April 6th, 2014 at 00:46) http://cryptomining-blog.com/1839-another-new-voltmod-update-for-the-gridseed-5-chip-btcltc-asic-miners/#comment-842 measured 33k for R139 (what we call R52 for easy reference).
Thanks Zig, this might be exactly what I've been hoping for. For me, I think it is easier to add a new axial resistor than to remove that tiny smd resistor. And, it could be easily re-bridged later if a SHA coin rises to and stays at the top of the profitability lists and you want to mine it.
Thanks Zig, this might be exactly what I've been hoping for. For me, I think it is easier to add a new axial resistor than to remove that tiny smd resistor. And, it could be easily re-bridged later if a SHA coin rises to and stays at the top of the profitability lists and you want to mine it.
Ok Guys --- ZigMod is official -
R46 Pads are bridged from factory
Image from Sandor11 & edited by Zig - R46 position is the pads on the far left all alone circled in black
https://ip.bitcointalk.org/?u=http%3A%2F%2Fi.imgur.com%2FKBfnITv.png&t=539&c=UEjhwR7D7EBeVw
Now you know where it is, unbridge the solder join at the pads with either a knife or sharp blade (GENTLY) . Once the join is cleary un-bridged you may now solder 17kohm 1% 0402 SMD resistor OR an Axial Resistor.
The Above according to Zig should give you 20w @ 510-515KH.
Thanks Zig, as this is your mod (Please correct me if I am wrong)
Guys the first person to try this please share with us your results and pictures preferably comparing the old mod side by side to see if both are to 2 and the same in performance and wattage
What should be the benefit of doing it ?
EDIT: I read through some pages. Aim was to get exactly 49.9kOhm as resistor value, is that correct ?
Zig can you verify this ?
Regards.
Anytime for you, Nemercry... I greatly appreciate you time and effort to share first the results of "R52" called mod ...!
R46 cut-off and soldering additional Rmod is Adding 16.9K to R139 = 33K ...resulting in 49,9K as you suggested in the first place...but is simpler procedure...easier to implement...and reverse...no messing with un-soldering R139 ("R52" as they called it) ...
The value of "R52" ...or to be precise R139 + Rmod in series ...doesn't NOT need to be exactly 49.9K IMHO ...this is why I just rounded to 50K...This difference has no effect on the resulting Voltage supplied to the Gridseed chips...less than couple mV ...
It is the same Mod as yours ...has the same effect...Rising the Reference voltage of the Voltage regulators...implemented in a different way...which requires less work...or possible mistakes...I believe...
ZiG
P.S.
Why I am doing this...Very simple...A friend of mine and myself are putting together Scrypt farm of 500 Gridseeds...After putting together $55,000 capital ...the order is already made and shipped...I have to come with reliable solution to squeeze every possible drop of performance...ready to go 24/7 ...and I don't want to spend my life to modify them...and babysit later...plugging-unplugging...messing with cables, hubs and what not...
Competition with Wolfey2014...the hell not...I was also telling him in the early days of this thread that I could use his services as well...NOT anymore...I'll be more than glad to hire somebody to do it... to my specs...
And after a month and a half in this thread, I just decided to share back...That's it...
Happy modding...
Thanks for the fast and in depth reply.
I marked some spots for you. If you do only the R52 Mod (marked as nr. 1) you got the possibility to undo the mod by doing the soldering on the two yellow bridges.
If you do so you will enable the green 2 resistor. Which is the original 950mhz mod aka 36kOhm.
Can you probably post a picture of your mod ? For now i dont see why it should be faster than replacing the R52.
(Probably i missed something)
Regards nemercry
Hi Nemercry,
There is just 1 (ONE) resistor to be solder...I called it Rmod =17K/16.9K...
It is to be soldered to the cut-off bridge pads of R46...1 cut...1 solder...that's it...simple...
The original resistor...Orange at position #1...You called "R52"... is in reality R139 = 33K...the last resistor in the chain of VID resistors ...the same one that you are replacing...This one is just STAYING in place...untouched...NO un-soldering needed... simple "work?.. no thanks"...
You are completely correct as of doing 2 bridges...marked "Yellow" to "undo" the R139/"R52" mod and to shift the Voltage reference back to resistor in the "green" position...=36K...
I am doing reversal of the Rmod in R46 position by simply shorting back R46 pads...even with Rmod in it...So effectively we back to R139/"R52" value = 33K...ORIGINAL stock value...schematics...performance...etc...
I hope it is clear now...
Regards, buddy...