mwl168 Posted March 14, 2019 Report Share Posted March 14, 2019 (edited) I am moving Kerry's mini GRHV\GRLV GB discussion to its dedicated thread here. I also included JoaMat's mini T2 here to see if we have enough interest for a GB. The table will be updated periodically as more people participate. Apologize if I missed someone or something - just let me know so I can correct the data. I put down one set for those that have not decided on the number of sets they want. The plan is to have assembled GRHVxxx boards, rest of boards will be PCB only. See discussions on the PS in this thread. mini T2 build discussion in this thread. Construction notes: R3 and R2 determine the regulated voltage for GRLV. The formula is Vout = (R2 + R3)/R3 * Vref. Vref is the reference voltage of U4 (LT1021). R7, R8, R9, R10 determine the regulated voltage for GRHV. The formula is Vout = ((R8 +R9 + R10)/R7 + 1) * Vref. Vref is the reference voltage of IC1 (LT1021). You want to keep R8, R9 R10 values close so they have even voltage drop across each of them. On the PSU Main board, R22 (100K) and C17 (470uf) set up the delay time for HV. The 100k/470uf combination provides a roughly 45 seconds delay. Increase R22 or C17 to increase the delay time. C17 needs to be rated 5VDC or higher. Board dimensions: mini T2: 160mm x 100mm GRHVxxx: 41mm x 31mm GR78xx/GR79xx: 30mm x 20mm Main board (PSU): 140mm x 90mm See BOM for boards at the bottom. Blank in the GRHVxxx-bare column indicates that the participant has not responded on this thread to indicate the preference for bare or partially-assembled boards and is deemed to opt for partially-assembled board by default as previously communicated. BOM: GRHV78xxx-BOM.xlsx miniT2v.22_Date_2020-02-16.xls GR78xx - V2 .xlsx GRHVBase-BOM - V2 production.xlsx GR79xx-V2.xlsx Edited February 16, 2021 by mwl168 10 Quote Link to comment Share on other sites More sharing options...
Whitigir Posted March 14, 2019 Report Share Posted March 14, 2019 (edited) Please count me in, GRHV 6x, GRLV 78- 2X and 79 -2X...uhm what is this mainboard ? Edited March 14, 2019 by Whitigir Quote Link to comment Share on other sites More sharing options...
jose Posted March 14, 2019 Report Share Posted March 14, 2019 Thanks Michael!! Please, two sets for my if it´s possible. Quote Link to comment Share on other sites More sharing options...
SeaWolf Posted March 14, 2019 Report Share Posted March 14, 2019 mwl168 please add in an additional set of psu boards for me. Also I am up for a set of mini t2 boards to help get the numbers up for that side of the GB Quote Link to comment Share on other sites More sharing options...
gepardcv Posted March 14, 2019 Report Share Posted March 14, 2019 To be clear, I want a set of Mini T2 boards along with a power supply set... was planning to use them together. Whether I'll want more sets will depend on price breaks. Quote Link to comment Share on other sites More sharing options...
chinsettawong Posted March 14, 2019 Report Share Posted March 14, 2019 @mwl168I do not need the mini T2 boards as I've got some already. Thanks for putting me in for those PS boards though. Quote Link to comment Share on other sites More sharing options...
Jon L Posted March 14, 2019 Report Share Posted March 14, 2019 I still need a real amp for my Stax OII and SR09, so if anybody is willing to commision an extra one for me, let me know. No timeline pressure, and I am in SoCal. TIA? Quote Link to comment Share on other sites More sharing options...
Skooby Posted March 14, 2019 Report Share Posted March 14, 2019 Micheal, can you add me/skooby to the PCB list: 4 x grhv, 4 x grlv78**, 4 x grlv79**, 2 x psu main board, 2 x t2 mini T2 mini board is married right, not separated (one board for both left/right chn)? Thanks for doing this, Micheal! Thank you to Kerry and Joachim for sharing the designs! Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 14, 2019 Report Share Posted March 14, 2019 2 grhv, 2 grlv78xx,2 grlv79xx, 1 main board, 1 mini t2 please Quote Link to comment Share on other sites More sharing options...
johnwmclean Posted March 14, 2019 Report Share Posted March 14, 2019 Thanks Michael, could I please get an a mini T2 as well. Quote Link to comment Share on other sites More sharing options...
Laowei Posted March 14, 2019 Report Share Posted March 14, 2019 (edited) This is great. Thank you Michael. Would you please add 1 mini T2 PCB to my row. Edited March 14, 2019 by Laowei Quote Link to comment Share on other sites More sharing options...
Scgorg Posted March 14, 2019 Report Share Posted March 14, 2019 Add me up for mini T2 as well please Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 14, 2019 Author Report Share Posted March 14, 2019 Table updated. Quote Link to comment Share on other sites More sharing options...
nopants Posted March 14, 2019 Report Share Posted March 14, 2019 I'll take one set for a T2, I snooped around a bit and it sounds like it's 2x GRHVxxx 1x GRLV78xx 1x GRLV79xx 1x main board 1x mini t2 board Thanks! Quote Link to comment Share on other sites More sharing options...
stickyjon23 Posted March 15, 2019 Report Share Posted March 15, 2019 Can I please have 2x grhvxxx, 1x grlv78xx, 1x grlv79xx, 1x main board, and 1x mini t2 board. Quote Link to comment Share on other sites More sharing options...
Inu Posted March 15, 2019 Report Share Posted March 15, 2019 Please add 1x main board. Thank you. Quote Link to comment Share on other sites More sharing options...
rumina Posted March 15, 2019 Report Share Posted March 15, 2019 great please add me with: 2x grhv, 4x grlv78xx, 4x grlv79xx, 1 main board, 1 mini t2 thanks Quote Link to comment Share on other sites More sharing options...
khadis Posted March 15, 2019 Report Share Posted March 15, 2019 Hi, i would like if possible 4 grhv, 4 grlv78xx,4 grlv79xx, 2 main board, 2 mini t2 please thanks in advance Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 15, 2019 Author Report Share Posted March 15, 2019 (edited) 22 hours ago, Whitigir said: Please count me in, GRHV 6x, GRLV 78- 2X and 79 -2X...uhm what is this mainboard ? You can find the information in this thread. The main board has the rectifiers, filtering caps and timed delay circuit for the HV among other things. Edited March 15, 2019 by mwl168 Quote Link to comment Share on other sites More sharing options...
joehpj Posted March 17, 2019 Report Share Posted March 17, 2019 4 grhv, 2 grlv78xx, 2 grlv79xx, 2 main board, 2 mini t2 please Quote Link to comment Share on other sites More sharing options...
grendel23 Posted March 17, 2019 Report Share Posted March 17, 2019 I will take 4 grhv, 2 grlv78xx, 2 grlv79xx, 2 main boards, and 1 mini T2, Thanks Quote Link to comment Share on other sites More sharing options...
shaihulud Posted March 18, 2019 Report Share Posted March 18, 2019 Please add me for 2 sets of PS boards and 1 mini T2 4 - GRHVxxx 2 - GRLV78xx 2 - GRLV79xx 2 - main boards 1 - mini t2 board Thanks Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 18, 2019 Author Report Share Posted March 18, 2019 Table updated. Quote Link to comment Share on other sites More sharing options...
zumac99 Posted March 18, 2019 Report Share Posted March 18, 2019 I’d like to take 2 - GRLV78xx and 2 - GRLV79xx please. Thanks Quote Link to comment Share on other sites More sharing options...
palchiu Posted March 22, 2019 Report Share Posted March 22, 2019 PIease add me for 1 set of mini T2(2, 1, 1, ,1, 1) thanks! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.