Closed - KGSSHV Carbon and GoldenReference HV PS Group Buy

[mwl168]

EDIT 8/4: attach updated GB details and remov outdated chart

EDIT 7/31: attach updated GB details and remov outdated chart

EDIT 7/27: attach GB details and remov outdated chart 

EDIT 7/23: attach PCB cost quotes and limit first time poster to 4 set of amp boards max.

EDIT 7/19: proposing use of HV Carbon V5 board to replace both V2 and V3 boards. See posting # 190.

EDIT 7/13: attach snapshot of final order entries and board count.

EDIT 7/12: This GB is officially closed as of 7/12/2015.

Due to the changes Kevin made to the PS boards, it'll take a few more days for these boards to be checked before I officially request quotes from the fab houses. I hope to have information on the cost of the various boards to share in a week or so. I will post an image of the spreadsheet here for all to review.

EDIT 7/9: Please double check and confirm or make any final updates to your record on the spreadsheet by end of day Saturday, July 11. On Sunday, July 12, I will officially close the GB, lock down the counts of the various boards, post a snap shot of the spreadsheet on this thread for your review and proceed to request final quotes from the fab houses.

As promised, I am planning a KGSSHV Carbon GB which includes both the amp boards and the PS boards. First I like to gauge the interest for the GB which will also help me estimate the cost of the PCB boards. My plan is to make 2mm thick PCB with 2oz copper. (EDIT 0731: HV PS boards are upgraded to 3oz copper)

For the amp board, we'll most likely use the latest board, kgsshvcarbonv2.zip and kgsshvcarbonv3.zip that Kevin posted on June 30 which has the cascode CCS and uses mostly current parts including the PZTA SMD parts. This board measures 5.45 x 4.05 inches according to Kevin. THIS BOARD HAS NOT BEEN CHECKED NOR TESTED AT TIME OF WRITING.

For the HV PS board, we have the following options (these HV boards contain built-in LV supply):

1. the GoldenReference dual HV (kgsshvpssicfetdual2new.zip that Kevin posted on June 27, 6 x 6.48 inches). I have checked this board by tracing the PCB visually and Kevin has corrected the issues I spotted and updated the schematic accordingly (see Kevin's post #4802 on the KGSSHV thread for the schematic). I cannot guarantee I did not miss something. THIS BOARD HAS NOT BEEN TESTED.

2. the split/single, "skinny" PS boards (one board for each rail), they are kgsshvpssicfetsinglenewleft.zip and kgsshvpssicfetsinglenewright.zip which were also posted on June 28 (3 x 6.48 inches). THESE SINGLE PS BOARDS HAVE NOT BEEN CHECKED NOR TESTED.

3. the split/single, "fat" PS boards (one board for each rail), they are kgsshvpssicfetsinglenewleftfat.zip and kgsshvpssicfetsinglenewrightfat.zip which were posted on June 28 (4.05 x 5.45 inches). THESE SINGLE PS BOARDS HAVE NOT BEEN CHECKED NOR TESTED.

For stand alone Golden Reference LV PS, two options (THESE PS BOARDS HAVE NOT BEEN CHECKED NOR TESTED):

1. the dual LV (goldenreferce3.zip)

2. the single LV (goldenrefernceplus4.zip and goldenreferenceminus4.zip)

We'll need to at least check these boards before proceeding to have them fabricated for the GB. I will try to find time to trace them but can really use others' help for double-checking.

To gauge the interest and to help get an idea of the volume in order to determine the cost, please respond with the following information (be specific) if you are interested in participating in this GB:

1. How many amp boards do you want. (one channel on each board, you need two amp boards for one complete amp.)

2. Which HV PS (dual, single skinny or single fat) and how many of them do you want. (you need at least one dual board or two single boards for one complete amp.) The HV PS has built in LV and bias sections. The separate LV PS and Bias boards are optional.

3. Please use this link to register your request: https://docs.google.com/spreadsheets/d/1GWDWwLfsIDtwn1HB-x76lS6WyWwLd5lwsORFKiUuuEQ/edit?usp=sharing

The chart below is for reference only and not up to date. The spreadsheet contains the up to date information. Please let me know if I missed anything.

It's advisable to read the the following posts at the minimal for relevant information to this GB: 16, 34, 42, 51, 68, 80, 89, 92, 113.

More to come.

Thanks!


EDIT 6/28: updated information due to the newly released "fat" single PSU and updated gerber files for PCBs

EDIT 7/3: added Golden Reference LV and Bias board options and start using sorenb's shared spreadsheet

EDIT 7/6: remove early spreadsheet image



Note: For the single PS boards, quantity of 2 indicates the participant will receive 1 left and 1 right boards (or 1 plus and 1 minus for the LV).

 

 

Edited December 6, 2015 by mwl168

[eggil]

I am for 2 sets of the Carbon.

[Laowei]

I'm in for 2 sets amp boards, with 2 sets split PS FAT boards.

Edit#2: Went all FAT.

Total:

(4 boards) amp PCBs

(2 boards) split PS left FAT PCB

(2 boards) split PS right FAT PCB

Edited June 29, 2015 by Laowei

[johnwmclean]

4 x Amp Board V3

2 x Dual HV PS

4 x Single FAT HV PS

 

Cheers!

Edited July 10, 2015 by johnwmclean

[blubliss]

2 sets for me.

[s_r]

I'm in for 5 sets (10x amp v3 boards, 5x fat left PSU, 5x fat right PSU).

Edited July 2, 2015 by s_r

[wokstarr26]

Thanks for organising the gb

 

Please put me in for two sets ie 4 amp boards, 2 fat left supply boards and 2 fat right supply board.

[samsie]

One dual supply board and 2 amp boards, please

 

Add 2 single supply board and 2 more amp boards

Edited June 28, 2015 by samsie

[chinsettawong]

Please put me in for 2 amp boards and 1 piece of single left and 1 piece of single right PS boards.

Sent from my SM-N9005 using Tapatalk

[UFN]

2 pairs of amp boards and two dual supply boards.

 

Possibly another pair of amp boards and a pair of the single supplies depending on price/availability.

 

 

//UFN

[nopants]

I'll take a set of amp boards and one of each power supply, sdual and single

Edited June 28, 2015 by nopants

[chiguy]

I'd be interested in a set of amp boards with the dual power supply and two sets of amp boards with the split power supply (both skinny and fat).  

 

6 V3 amp boards

1 dual PS board

1 skinny left PS board

1 skinny right PS board

1 fat left PS board

1 fat right PS board

 

 

EDIT: updated upon release of the fat PS boards

EDIT 2: updated to indicate all V3 boards

Edited July 3, 2015 by chiguy

[b0bb]

I would like the following please

V3 Amp pcb

4 boards

 

DUAL PSU pcb

4 boards

 

Dual LV PS pcb

4 boards

 

Thanks

[insanity]

4 Amp boards, 1 dual psu board and 1 of each left/right psu board.

 

@mwl168

 

I have heard from sorenb that there were some quality issues with the kgst boards from the recent GB. I cannot comment on this, because I have not used my boards I got from this GB yet.

Therefore the question: Will you be using the same manufacturer or anonther? I think for an Amp such as the Carbon higher quality PCBs could really be justified, even if it adds a bit to the cost. 

Edited June 28, 2015 by insanity

[sorenb]

I'm in for 

 

4 amp boards

4 HV Golden Ref split version (with caps mounted off board)

4 LV Golden Ref split version

4 the bias board kevin 

[kevin gilmore]

i will be updating the v2 amp board and dual power supply boards shortly.

 

increasing the distance on the heatsink to .8 inches so that the heatsink completely covers the metal

part of the fet and shrinking the amp board slightly.

 

here is the final stuff unless someone finds an error

 

http://gilmore.chem.northwestern.edu/kgsshvcarbonv2.jpg

http://gilmore.chem.northwestern.edu/kgsshvpssicfetdual2new.jpg

 

http://gilmore.chem.northwestern.edu/boards/kgsshvpssicfetdual2new.zip

http://gilmore.chem.northwestern.edu/boards/kgsshvcarbonv2.zip

 

single version boards updated

 

amp board 5.45 x 4.05 inches 211 holes

 

psdual board 6 x 6.48 inches 287 holes

 

ps single boards 3 x 6.48 inches

Edited June 28, 2015 by kevin gilmore

[judo]

One set with dual psu

[GeorgeP]

Thanks for putting this on.

 

Would like

 

3 sets of amp board (6 pieces)

1 set of split power supply (2 pieces)

1 goldenreference dual board (1 piece)

[greyrab]

I would like 2 sets of amp boards, 1 set of split power supply and 1 goldenreference dual board.

 

Thanks.

[gepardcv]

Thank you for organizing this. I'm in for 2 sets of v3 amp boards (4 total), 2 sets of split PSU (fat version, 2 left, 2 right), and 2 sets of split LV boards (2 left, 2 right).

 

Edit: Switched to v3 boards.

Edited July 11, 2015 by gepardcv

[Kerry]

I'll do one set of amp boards and one dual power supply.

[MLA]

Thanks for organizing this!

I'm in for 2 amp boards and pair of fat power supply boards.

Edit: V3 of the boards preferred, but V2 is great too!

[kevin gilmore]

one pair of amp boards and one pair of fat power supply boards

or 1 dual power supply board.

[s_r]

How about using the fat version of the split PSU (kgsshvpssicfetsinglenewrightfat.zip and kgsshvpssicfetsinglenewleftfat.zip)? I'd change my interest to these over the dual PSU board if they're used.

[sorenb]

the idea behind splitting the PSU into HV, LV and Bias board is that it is more versatile ...I asked Kevin to keep the width less than 80mm(2U) so you have the option of mounting upright rather than horisontal in order to cram the amp into less space ...

Also I asked Kevin to include option for NB on the Bias board ...