tomislavkufrin Posted March 21, 2020 Report Share Posted March 21, 2020 i would like to get in the group buy. for me please: 4x GRHVxxx 2x GRLV79xx 2x GRLV78xx 2x Main Board 2x miniT2 - bare boards. Quote Link to comment Share on other sites More sharing options...
Blueman2 Posted March 21, 2020 Report Share Posted March 21, 2020 @mwl168, can you adjust my order to move from 4 pre-assembled GVHVxxx to 2 pre-assembed and 2 bare? on your spreadsheet: 2, 2, 2, 2, 2, 1 Thanks Quote Link to comment Share on other sites More sharing options...
Oneguy Posted March 22, 2020 Report Share Posted March 22, 2020 Please add the following to my order: 1x PSU main board 1x GRLV78 1x GRLV79 2x GRHVxxx (bare PCB) Quote Link to comment Share on other sites More sharing options...
Flyingsparks Posted March 23, 2020 Report Share Posted March 23, 2020 Could I be added with the following:4x GRHVxxx - partially populated2x GRLV79xx 2x GRLV78xx 2x Main Board 1x miniT2Cheers, Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 23, 2020 Author Report Share Posted March 23, 2020 (edited) Table updated. Please do double check and let me know if I have made mistakes. I will tally up the final board counts and get quotes from the fab house. I will then update the table with board costs and the total due for each participant and start collecting payments. I will place the order when all payments are collected. Please note the payment will include boards cost and shipping charge from the fab house to me (shipping evenly distributed to each board) but will not include shipping charge from me to you. The following participants are dropped from this GB due to no response: Marc Edwards stickyjon23 zumac99 Edited March 23, 2020 by mwl168 2 Quote Link to comment Share on other sites More sharing options...
mikeymad Posted March 23, 2020 Report Share Posted March 23, 2020 Many thanks Michael - good to go from me.. Quote Link to comment Share on other sites More sharing options...
judo Posted March 23, 2020 Report Share Posted March 23, 2020 2 hours ago, mwl168 said: Table updated. Please do double check and let me know if I have made mistakes.... This: "Dear Michael, increase my GRLV78 XX, GRLV79xx numbers to 3 each from 2, please! Thanks!!" Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 23, 2020 Author Report Share Posted March 23, 2020 Corrected. Thanks! Quote Link to comment Share on other sites More sharing options...
chinsettawong Posted March 23, 2020 Report Share Posted March 23, 2020 Dear Michael, Please add one more main board for me. So, the new total is 4 main boards. The rest are correct. Many thanks. Wachara C. Quote Link to comment Share on other sites More sharing options...
Discom Posted March 23, 2020 Report Share Posted March 23, 2020 Could you increase my GRHVxxx bare PCB from 6 to 10? Otherwise I'm good. Thanks! Quote Link to comment Share on other sites More sharing options...
JoaMat Posted March 23, 2020 Report Share Posted March 23, 2020 Michael, Add 2 mini T2 boards. Thank you, Joachim Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 23, 2020 Author Report Share Posted March 23, 2020 Table updated. Quote Link to comment Share on other sites More sharing options...
boinger Posted March 24, 2020 Report Share Posted March 24, 2020 How many of these boards are needed for a mini t2 build? I would like to get it for 1 mini t2 and potentially a psu for 1 kgsshv carbon Bare with me as im pretty new to the ES amp building. Quote Link to comment Share on other sites More sharing options...
thuytn Posted March 24, 2020 Report Share Posted March 24, 2020 Michael, Could you revise my order to just 5x mini-T2 and no psu? My friend backed out so I think 5 is enough for me. Thanks again! Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 24, 2020 Author Report Share Posted March 24, 2020 (edited) 14 hours ago, boinger said: How many of these boards are needed for a mini t2 build? I would like to get it for 1 mini t2 and potentially a psu for 1 kgsshv carbon Bare with me as im pretty new to the ES amp building. For a complete PSU, you need 2 GRHVxxx, 1 each GRLV78xx, GRLV79xx and the PSU main board. GRLV78/79 can be replaced with 7815\7915 regulators. Each mini T2 set includes a left channel and right channel board for a complete amp. With due respect, with high, lethal voltage, SMD, etc., this is not a good project for a beginner to take on. Please also read through this thread and the mini T2 and KGSSHV build threads for information. Table updated. Edited March 24, 2020 by mwl168 Quote Link to comment Share on other sites More sharing options...
Blaino Posted March 24, 2020 Report Share Posted March 24, 2020 I am committed. Ready when you are. Quote Link to comment Share on other sites More sharing options...
SeaWolf Posted March 25, 2020 Report Share Posted March 25, 2020 ^^ agreed Covid19 be damned! Quote Link to comment Share on other sites More sharing options...
nopants Posted March 25, 2020 Report Share Posted March 25, 2020 I'd like to add 1 78xx 1 79xx 1 mainboard to my order (effectively 3 psu sets total) Thanks! Quote Link to comment Share on other sites More sharing options...
mwl168 Posted March 25, 2020 Author Report Share Posted March 25, 2020 (edited) Table updated. Construction notes for those getting started to source parts for your builds: 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. Also added these construction notes in the first post for ease of access. Edited March 25, 2020 by mwl168 3 Quote Link to comment Share on other sites More sharing options...
boinger Posted March 26, 2020 Report Share Posted March 26, 2020 I have built a beta 22 and sigma 22 amps from amb. I have also repaired my blue Hawaii several times with live circuits for testing. I am just new to electrostatic amp construction from scratch. So I would love guidance. Having said that. I will take a full set for a mini t2 and psu. Plus a full psu. Quote Link to comment Share on other sites More sharing options...
Blueman2 Posted March 26, 2020 Report Share Posted March 26, 2020 (edited) 2 hours ago, boinger said: I have built a beta 22 and sigma 22 amps from amb. I have also repaired my blue Hawaii several times with live circuits for testing. I am just new to electrostatic amp construction from scratch. So I would love guidance. Having said that. I will take a full set for a mini t2 and psu. Plus a full psu. boinger, You will need to specify which boards and how many. Also, if you want bare or partially assembled GRHVxxx boards. That way, there will be no confusion. Good luck! Edited March 26, 2020 by Blueman2 Quote Link to comment Share on other sites More sharing options...
boinger Posted March 26, 2020 Report Share Posted March 26, 2020 1 mini t2 set 4 grhv 2 each GRLV78xx, 2 GRLV79xx 2 PSU main board That should give me 2 full psu sets correct and 1 mini t2 amp set? 1 full psu should be good for the kgsshv carbon yes? Quote Link to comment Share on other sites More sharing options...
Blueman2 Posted March 26, 2020 Report Share Posted March 26, 2020 7 minutes ago, boinger said: 1 mini t2 set 4 grhv 2 each GRLV78xx, 2 GRLV79xx 2 PSU main board That should give me 2 full psu sets correct and 1 mini t2 amp set? 1 full psu should be good for the kgsshv carbon yes? Yup. Do you want the GRHV partially assembled? Might be worth it if you have not done a lot of SMD work. Quote Link to comment Share on other sites More sharing options...
JoseA Posted March 26, 2020 Report Share Posted March 26, 2020 Hi mwl168, How the payment is done? Do you have a PayPal account? Regards Quote Link to comment Share on other sites More sharing options...
boinger Posted March 26, 2020 Report Share Posted March 26, 2020 @Blueman2 Yes whatever boards can be populated please do Quote Link to comment Share on other sites More sharing options...
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