kevin gilmore Posted May 29, 2015 Report Share Posted May 29, 2015 http://gilmore.chem.northwestern.edu/boards/ksa5psgsmall.zip old board was 6.27 x 4.8 new board is 5.5 x 4.37 changed mpsw to pzta Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted May 30, 2015 Report Share Posted May 30, 2015 actually the golden reference regulator does perform slightly better than the krell supply with a couple of changes. (lt1021 and dn2540 replacing fet and lm336) krell supply is about 2 microvolts of noise at 500ma, the golden reference is 90 nanovolts of noise at 500ma. if people want, I can turn the krell supply into the golden reference, but still with the on board heatsinks. definitely will cost a fair bit more than the Chinese version. Quote Link to comment Share on other sites More sharing options...
spritzer Posted May 30, 2015 Author Report Share Posted May 30, 2015 I'm sure we can make a smaller board but having heatsinks on the board would be nice. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted May 30, 2015 Report Share Posted May 30, 2015 (edited) updated ksa5 small board and golden reference changes from the original, on board heatsinks, darlington outputs and lt1021 as the reference, 10V which makes a difference too. http://gilmore.chem.northwestern.edu/goldenreference.jpg http://gilmore.chem.northwestern.edu/boards/goldenreference.zip Edited May 30, 2015 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 4, 2015 Report Share Posted June 4, 2015 the original and the boards i'm getting from birgir soon have one land missing from the 4.7uf cap to the right of the input connector. Jumper the ground line to the electrolytic next to it. board files updated. after i verify the surface mount boards work, i will have 2 sets of extra boards if people want them, also one set of boards with the mpsw parts. Quote Link to comment Share on other sites More sharing options...
sorenb Posted June 4, 2015 Report Share Posted June 4, 2015 the original and the boards i'm getting from birgir soon have one land missing from the 4.7uf cap to the right of the input connector. Jumper the ground line to the electrolytic next to it. board files updated. after i verify the surface mount boards work, i will have 2 sets of extra boards if people want them, also one set of boards with the mpsw parts. PM sent; I'll go for the two SMD boards Quote Link to comment Share on other sites More sharing options...
gepardcv Posted June 4, 2015 Report Share Posted June 4, 2015 the original and the boards i'm getting from birgir soon have one land missing from the 4.7uf cap to the right of the input connector. Jumper the ground line to the electrolytic next to it. Looks like you changed the kgdynalobal5 boards, the originals with MPSW parts, which have been used in quite a few builds with no apparent problems. What does this change affect (and how did you notice the missing lead)? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 5, 2015 Report Share Posted June 5, 2015 (edited) yep i fixed it. one of the caps was not working because the ground was not hooked up. highly unlikely that anyone would know, but easy to fix. everyone with those boards should add the jumper. how I found it was I was working on adding more area to the heatsink on the surface mount board and saw that the pin was not connected. what I could do now is add some ground plane on the back of that board like I have done for the others. lower impedance ground means even less noise Edited June 5, 2015 by kevin gilmore 1 Quote Link to comment Share on other sites More sharing options...
GrindingThud Posted June 5, 2015 Report Share Posted June 5, 2015 Wow, it's almost invisible to the eye, but checks easy with the DMM. I thought someone had swapped my obecalp prescription....now I know what was going on. Quote Link to comment Share on other sites More sharing options...
ang728 Posted June 5, 2015 Report Share Posted June 5, 2015 didn't notice at all , almost invisible now patching Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 5, 2015 Report Share Posted June 5, 2015 if helps to have a bigass monitor. (32 inch, 2.5k) but its no longer enough, i need a 4k monitor thats about 40 inches for my desk. 60hz and the video card that goes with it. any suggestions? Quote Link to comment Share on other sites More sharing options...
nopants Posted June 5, 2015 Report Share Posted June 5, 2015 when you drop stats like that it sounds like you're in the market for an hdtv I was recently looking at the Asus PQ321Q, but I couldn't realistically afford it unless I sold both my kidneys I think something along the lines of a 960/970 would be enough to drive it, as long as you don't have any special requirements for CAD, etc. Quote Link to comment Share on other sites More sharing options...
Helium Posted June 5, 2015 Report Share Posted June 5, 2015 what I could do now is add some ground plane on the back of that board like I have done for the others. lower impedance ground means even less noise Like what board? Can you give a link please? I far as I have seen from repository, all KG dynamic amps have only top copper ground plane at best. Which one already enjoys bottom ground plane? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 5, 2015 Report Share Posted June 5, 2015 (edited) latest posted kgdynalobal5,kgdynalobal7,ksa5pssmall,goldenreference have ground planes on both sides. the first 2 were updated today. kgsshvpssic also has ground planes on both sides. 2 of birgir's latest boards have the same thing. all the above now have teadrops making the holes more reliable. grass does not grow under the feet of the stax mafia as you get older you need a bigger monitor. so getting a uhd display that is 28 inches from my current 32 inches is clearly the wrong direction. same thing with horsepower Edited June 5, 2015 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
Helium Posted June 5, 2015 Report Share Posted June 5, 2015 Thanks, I see now. Offtopic: any plans to update dynahibal8, dynahibal9, ssdynahibalsmt and the like as well? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 5, 2015 Report Share Posted June 5, 2015 version 8 are the boards i am getting next week. no reason to update that. version 9 has a bit more heatsink on the outputs, otherwise identical. will do the dynahi soon Quote Link to comment Share on other sites More sharing options...
ang728 Posted June 6, 2015 Report Share Posted June 6, 2015 if helps to have a bigass monitor. (32 inch, 2.5k) but its no longer enough, i need a 4k monitor thats about 40 inches for my desk. 60hz and the video card that goes with it. any suggestions? I am planning to get a Philips BDM4065UC 4K@60hz VA Panel looks decent Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 6, 2015 Report Share Posted June 6, 2015 so there were problems with the golden reference board, plus I added another stage to bring the noise down to 1.2 nanovolts peak to peak. (the 120hz is now at the rest of the noise....) PLEASE CHECK THIS! before I make boards that I have to throw out. http://gilmore.chem.northwestern.edu/goldenreference.pdf http://gilmore.chem.northwestern.edu/goldenreferenceboard.pdf http://gilmore.chem.northwestern.edu/goldenreference.jpg The 47uf caps are tantalum but the lead spacing is right Quote Link to comment Share on other sites More sharing options...
lkong Posted June 6, 2015 Report Share Posted June 6, 2015 if helps to have a bigass monitor. (32 inch, 2.5k) but its no longer enough, i need a 4k monitor thats about 40 inches for my desk. 60hz and the video card that goes with it. any suggestions? how about dell u3415w Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 6, 2015 Report Share Posted June 6, 2015 that is too small. 40 inch seems about right. the Phillips sure is close. would like an oled, but that is probably not going to happen in smaller sizes. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 7, 2015 Report Share Posted June 7, 2015 finally a bom for the current boards http://gilmore.chem.northwestern.edu/ssdynalobal.xlsx 1 Quote Link to comment Share on other sites More sharing options...
Helium Posted June 7, 2015 Report Share Posted June 7, 2015 When things are changing so fast, it's hard to follow the story. So, Goldreference is the updated and improved KSA5 PS board, right? This one: http://gilmore.chem.northwestern.edu/boards/ksa5psg.zip And it also must be compatible with KSA5 clone, Susy dynahi. Seems complicated (no no, not a drawback). Curious how is it compared with Sigma22? Maybe worth to try it with Beta. On silkscreen, 2000 Ohm resistors marking near DC output are upside down... What should be changed to push it to +-24V? +-30V? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 7, 2015 Report Share Posted June 7, 2015 (edited) there are 4 different designs now for the ksa5. the first power supply is the double zener thing. the second one is the alternate ksa5 power supply which is fully regulated. the third one is a shrunk version of the second one. the 4th one is the goldenreference board. the goldenreference is a different although similar design. about a factor of 100 less noise. my version of the Chinese thing has an extra current source in the front end, more current delivery due to darlington output, and way better and more accurate reference. and current sources that are very stable (none of that e series crap) to change for higher voltages, you change the lower feedback resistors and the power transformer. R7 and R10 http://gilmore.chem.northwestern.edu/goldenreference.pdf and I know the protection diodes are missing from the schematic. 2000 labels fixed in the zip file going to be way more stable than sigma22 and bunches less noise. its good for 500ma, maybe more. will have to test. so for dynahi, you need 2 otherwise you need one, and it works at any voltage 15,20,22,24,30 if you really want it to do 12v then you have to change the reference to 5v and technically you might want to adjust the zener D4,D6 to be roughly half of the desired output voltage. as shown its 20v for the ssdynalo i could do an off board version with flying output transistors, then on big heatsinks, as much power as the transformer can supply Edited June 7, 2015 by kevin gilmore 1 Quote Link to comment Share on other sites More sharing options...
Helium Posted June 7, 2015 Report Share Posted June 7, 2015 Aaa want! Seems that I will add 1 more PS case with goldenreference. It will be 5 case setup: balanced beta22, Susy dynahi, Krell clone, Sigma22 PS, Goldenreference PS. All amps will include full setup of AMB delta1/delta2 with screen and motorized pot. PS cases will include Sigma11 for 5VDC as well, 2 transformers and Crydom/Tyco SSR. I've buit maybe 15 Betas already, this one will be most complicated and for myself. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 7, 2015 Report Share Posted June 7, 2015 this will definitely fit in the case i did for the krell, but might fit in the smaller case. Quote Link to comment Share on other sites More sharing options...
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