July 31, 201313 yr comment_591824 Is it my imagination, or is something wrong with the Dymahi BOM? Report
July 31, 201313 yr Author comment_591825 It's the BOM for the latest onboard version so it might look different from before. Report
July 31, 201313 yr comment_591840 Thanks Tran. That webpage with all the information is just what I needed. Report
August 1, 201313 yr Author comment_592013 I will try to add more info later on when there are more finished builds. Report
August 1, 201313 yr Author comment_592033 I will get more details regarding the T2 chassis later next week. Edited August 1, 201313 yr by Lil Knight Report
August 1, 201313 yr comment_592052 So I guess this GB is over. If anyone wants to get rid of some KSA5 boards consider me interested. Edited August 1, 201313 yr by VPI Report
August 1, 201313 yr comment_592053 I will get more details regarding the T2 chassis later next week. Here's to hoping for some gunmetal powder-coating! Report
August 1, 201313 yr comment_592084 Added late to list for HV on board if there are extras. Should I pay now or wait for confirmation. Thanks Report
August 2, 201313 yr Author comment_592096 So I guess this GB is over. If anyone wants to get rid of some KSA5 boards consider me interested. I do order extra boards so feel free to fill in the spreadsheet. Report
August 2, 201313 yr Author comment_592098 Great. Thanks in advance if you come across an extra set. Shouldn't be a problem with that. Added late to list for HV on board if there are extras. Should I pay now or wait for confirmation. Thanks Just check your auto-calculated total, if it's correct, then you are good to go. Report
August 6, 201313 yr comment_592690 Tran! How much is the aproximative cost for T2-case and misc. hardware (you provide) for it? Report
August 6, 201313 yr Author comment_592692 Not sure yet but I am aiming at $1k-$1.25k for a pair of chassis. This includes powder coating and laser engraving. I initially thought of providing parts only but decided to go full set. Report
August 7, 201313 yr comment_592871 Are the boards still available for order?? I am very keen to build some. Report
August 9, 201313 yr comment_593095 Hello, Are the boards still available for order?, I'd like to build a balanced Dynahi, if I understood well, I should order 2 Dynahi sets, in these sets are included the PSU boards too, Is that right? How I should do the payment? Thanks! Report
August 9, 201313 yr Author comment_593116 It was already said in this thread. Only 1 is enough for balanced. No PSU. Would appreciate if you could read this thread from page 1. Report
August 10, 201313 yr comment_593278 Is there a square wave schematic? I don't know much, or rather anything, about this amp. If not, I can draw one from the PCB when it arrives. The silk screen says +-15V, but PSU is going to put in about +-22V, without changes. Should the PSU get tweaked or is the plan to run it at +-22V with a different opamp? Also, does each board pair pull more current than the KSA5, since it comes with 2 PSU boards? It doesn't look like it will from what I can make out. What's the quiescent current draw of each board, or each balanced channel, or all 4? Edited August 10, 201313 yr by holland Report
August 10, 201313 yr comment_593301 There should be a schematic in the "now for something different thread" or I could just be imagining things. I'm sure Kevin sent me a link to it at some time or I can try and find the simulation files... Report
August 10, 201313 yr comment_593363 Thanks, Birgir. It's an interesting thread to say the least. There are these 2 links, though the pdf schematic doesn't match the pcb shown in the jpg. It's close enough, however, I'm not sure if either of those were the actual PCB. The only differences that I can see is that the servo outputs to the bottom of the 49.9 resistor instead of tweaking the bias point of the NPN. The 49.9 resistor is connected to a 4.7uf cap to float it. It's also a RC filter if I'm not mistaken, to roll off some bandwidth. The other is the diode string is replaced with an active circuit for adjustable bias. http://gilmore.chem.northwestern.edu/squarewaveproduction.pdf http://gilmore.chem.northwestern.edu/squarewave.jpg I think I'll use +-15V @ 25VA for the balanced config with 1N4747 and 1N4745 in the supplied PSU boards. Edited August 10, 201313 yr by holland Report
August 10, 201313 yr comment_593388 http://gilmore.chem.northwestern.edu/squarewaveproduction.pdf http://gilmore.chem.northwestern.edu/squarewave.jpg this is the board lil-knight is producing The nominal current with the 1.5 inch high heatsinks is 80ma with the 2.5 inch high heatsinks you can go to 100ma pot and 75k resistor are designed so that you can't over do it. Edited August 10, 201313 yr by kevin gilmore Report
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