Quote from: mb300sd on October 25, 2013, 11:05:46 PM

Quote from: kaerf on October 25, 2013, 08:04:59 AM

Quote from: mb300sd on October 25, 2013, 07:54:51 AM

Quote from: kaerf on October 25, 2013, 07:44:45 AM

Quote from: buzzdave on October 25, 2013, 07:23:56 AM

We are a couple days yet from getting our 16 chip boards with the trimmer on the board. I have some 8 chip boards that are an experimental OC board that use the same trim pot and I want to set the stage for how this will work.

In order to use this trimmer, you *must* have a multimeter and know how to measure resistance. If you don't know what I'm talking about, you aren't ready to try to OC your boards.

An easy place to take resistance measurements is to get ground off the M-board GND terminal (where you would connect direct 12V cables - the terminal screws). The red probe would go on the top metal contact of the Pulse inductor, which is the large bulky component on the H-card. Be sure not to also touch the caps that are nearby or you won't get a correct voltage.

While measuring the voltage, use your super-micro tweaker phillips screwdriver to *slowly* turn the trimmer clockwise for higher voltage or counter-clockwise for lower. The trimmer has an effective range of about 180-degrees. If you turn it down too far, you will see voltage begin to rise again.

Don't make voltage changes quickly. If you go higher than about .895v you better know what you are doing or you will kill your chips. I don't even know what voltages people are getting away with on these boards. Find a guide or post before you start mucking around. Overclocking *will* reduce the reliability of the boards.

nice to see you guys selling 8 chips boards. FYI, for the one I made (https://bitcointalk.org/index.php?topic=228677.msg3259455#msg3259455), I'm running around 0.9v and pulling 21-22GH and ~23W. been too lazy to try higher voltage.

do i see oshpark boards? I've been placing quite a few orders there lately

yup, they are pretty convenient and relatively cheap

Would you be willing to sell that board on their market? I might be interested in a couple.

Here are the design files...

board and schematics
https://mega.co.nz/#!89gQkSwD!MDH1iXvlsSogk3XUIjjuVDP_EW9drPgCeogcdzwCI7U
gerbers
https://mega.co.nz/#!Yoh1yJoa!NhdcoRqV7qH9TwMq5V15SyC5O4wbv8cByE6ItZLHGc0
stencil
https://mega.co.nz/#!I44VjQAb!YYo9-EVSZiuvPcBu8-wBUAmlGm0DTr0T8nDBGYf9lNY

Even though these work for me I'd still recommend you review them before use...I'm not an EE, but it was fairly straightforward to redraw the 8chip board. It was a quick job, so there are extra holes and the component names are not sequential. The nice thing that i added was holes for a standard chip set heatsink (59 mm diag spacing)