Quote from: nemercry on March 27, 2014, 01:43:44 AM

Quote from: Xer0 on March 26, 2014, 10:33:46 PM

Quote from: trixster67 on March 26, 2014, 06:37:04 PM

So anyone out there with a good camera that can take very clear pics of areas will be a hero to me besides the guys who worked all this out in first place

camera? i have something better, wait a sec Wink

oh, sorry. i tought scanning it with 1200dpi would produce better results,
but the focus got not far enough, even with my real tube ccd scanner

Thats a really good picture. Nice work

.
I am looking for a way to make the "pencil" mode more time efficient. That would mean for me, that i will solder the correct resistor there that you reach 1.01V and the rest will be given by the pencil then. (lets assume you can go +- 0.01V with pencil mod, without changeing the voltage when occasionally sneeze on it.)].

OC Unit (2 bridge pin mod, 950mhz)
I measured 120,7 kohm on r211 and 0,3v
I measured 65.6 kohm between r211 and r212 1,09v
I measured 60kohm, 0,8v r212
OC+ Unit (1050mhz and 39k 1% resistor + pencil mod)
I measured 7 kohm on r211 0,03v
I measured 60.2 kohm between r211 and r212and 0,82v ( i measured it twice, i rubbed a little on the carbonglue and needed to recheck: 61kohm, 0,85v)
I assume 60kohm, 0,8v r212 (was not changed, so it should be the same)

So lets do some correlation:
65,6kohm / 1,09V = 60,18349kohm/ v * 1.01v = 60.785kohm
60.2kohm / 0,82v = 73.41464kohm /v * 1.01v = 74.149 kohm
(61kohm/0,85v = 71,7648kohm/v * 1.01v = 72,482 kohm)
(not sure where this offset comes from, i just assume that is just not a linear ?,(but i will try linear interpolation) )

Interpolation:

x = 1.01v; f(x)[kohm]; f0 = 60,2kohm,f1 = 65,6kohm, x0 =0,82v; x1 = 1,09v
f(x) = 64kohm
So my assumption would be, that ill get 1.01v when i can set the resistance between r211 and r212 to 64kohm.
Achievable that way:
x = (1.01 -0,8V ) = 0.21v; f(x)[kohm]; f0 = 7kohm,f1 = 120,7kohm, x0 =0,03v; x1 = 0,3v
= 82,8kohm

So in short: i need to replace the R211 with 82,8kohm and i would get a steady 1.01V.
Please confirm if correct.

On my currently modded unit, i remeasured things. Looks like as i did a little overshoot with the carbonglue

... As it got hard, it was more conductive and my pll voltage is now 0,82V:
I know that it is not a 24h run, and i am scientifcly very sorry for that and will post one the next days. In our first run it was much more stable, when the voltage was at 0.94V.
I will reduce som of the carbon glue and will rerun a new test.

Is there actually a scientific proven reason, why 1.01V shouild be the sweatspot ? In our sample, i could not measure any differences.
Can also someone specify which size the smd resistors are currently ? I mean which type of smd resistors (to be exact: which size?) are they ?

regards,
nemercry

Hey. Great work there!
But the pencil mod or replacing that resistor may not be necessary.
I too am interested in the good ol' KISS rule!
I believe I may have found a way around it all together by replacing a different component.
I'm experimenting right now so I am not going to say which one it is. I don't want to risk hearing someone elses mod went pppppppppfffffsssssssszzzzzzzzzzztttttttttt!
I"m okay with bricking one of mine if it happens, which it most likely won't Wink

Anyone that can use a good pencil iron should be able to do these mods too.
Pencil mod! Pshhhhhhhhhhhh!
Keep your fingers crossed.
Wolfey2014