Hens Posted September 6, 2010 Report Share Posted September 6, 2010 I'd like to be in too please Board and kit Quote Link to comment Share on other sites More sharing options...
mattcalf Posted September 6, 2010 Report Share Posted September 6, 2010 Should find out if I'm going to have lucrative employment next year or be a poor uni student, which determines whether or not I'll seek to be included in this project. Just want to indicate my interest now though. Thanks. Quote Link to comment Share on other sites More sharing options...
Currawong Posted September 6, 2010 Report Share Posted September 6, 2010 I'm still up for this. IMO, what would be practical would be to have the main board built to be able handle whichever power supply is chosen, which if I understand you guys correctly, is basically what is happening. Then down the track, if one chooses, one could build the balls-to-the-wall PSU. Right now, the middle-of-the-road option would be for me. It has to be good enough I wont feel the need to upgrade with O2s. Maybe once I've moved out of my stupid apartment with its 30A main fuse that I blow once a week, to a place with a decent power supply, then I'll consider getting a drill press and going crazy. Now I probably should build the bog-standard KGSS with the boards I have here as a warm-up. Quote Link to comment Share on other sites More sharing options...
spritzer Posted September 6, 2010 Report Share Posted September 6, 2010 As it stands now, we will offer one PSU only for the foreseeable future. There is also no need to keep posting your interest in this project, we only need that once the preorder thread goes up. There will be enough boards for everyone. Quote Link to comment Share on other sites More sharing options...
Lil' Knight Posted September 6, 2010 Report Share Posted September 6, 2010 I suppose we could use both SE and balanced source, right? Quote Link to comment Share on other sites More sharing options...
spritzer Posted September 6, 2010 Report Share Posted September 6, 2010 It's a fully balanced amp but you only have to ground the - input if using it single ended. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 6, 2010 Report Share Posted September 6, 2010 I just had a strange idea. What if you used the PCB itself as a drilling template that had the same diameter as the bit needed to drill out a #4-40. Drill one on each end of the board, tap those, screw them in, and then go down the board and drill the rest. Then you'd have to go back and enlarge the holes so a #4-40 could fit through them. If you didn't need to tap anything, it's even easier, just make them all #4-40 through hole and buy a bit the same diameter. Seems easy enough and you'd be able to generate a perfect angle bracket... The PCB I think would be thick enough to provide a nice template. Quote Link to comment Share on other sites More sharing options...
crappyjones123 Posted September 6, 2010 Report Share Posted September 6, 2010 I just had a strange idea. What if you used the PCB itself as a drilling template that had the same diameter as the bit needed to drill out a #4-40. Drill one on each end of the board, tap those, screw them in, and then go down the board and drill the rest. Then you'd have to go back and enlarge the holes so a #4-40 could fit through them. If you didn't need to tap anything, it's even easier, just make them all #4-40 through hole and buy a bit the same diameter. Seems easy enough and you'd be able to generate a perfect angle bracket... The PCB I think would be thick enough to provide a nice template. for those of us who arent as technically savvy as others, are you suggesting that one tape down the pcb to the bottom of the chassis and drill a hole through the pcb and the bottom of the case OR that the pcb already has a hole and after taping the pcb down the to the bottom of the case, one drills through the case where ever a mounting hole is present on the pcb? my apologies if you meant something entirely different. obviously i misunderstood. in both events i would be rather scared of damaging the pcb. what are the chances that something like that would happen? Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 6, 2010 Report Share Posted September 6, 2010 for those of us who arent as technically savvy as others, are you suggesting that one tape down the pcb to the bottom of the chassis and drill a hole through the pcb and the bottom of the case OR that the pcb already has a hole and after taping the pcb down the to the bottom of the case, one drills through the case where ever a mounting hole is present on the pcb? my apologies if you meant something entirely different. obviously i misunderstood. in both events i would be rather scared of damaging the pcb. what are the chances that something like that would happen? I was suggesting a way that external heatsinks might work, as Kevin mentioned the bracket construction might be a show stopper for some. Plenty of dynahis have been built with external devices.. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted September 6, 2010 Author Report Share Posted September 6, 2010 (edited) looks like about $350 in parts with the transformer. plus the circuit boards much better version of the bom, still missing the other parts of the thermal washers and part numbers for those http://gilmore.chem.northwestern.edu/kgsshvbomas.xlsx you would need to add input connectors and a pot. If someone wants to do a group buy on all the transistors, and someplace else other than the usual place, i'm sure we can get the price down somewhat. Edited September 6, 2010 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
spritzer Posted September 6, 2010 Report Share Posted September 6, 2010 The chassis mounted sinks are simply out of the question and that's that. This is an amp meant to bring close to TOTL performance at a budget price and designed so that anybody can build it. Quote Link to comment Share on other sites More sharing options...
johnwmclean Posted September 6, 2010 Report Share Posted September 6, 2010 (edited) delete. Edited September 22, 2011 by johnwmclean Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted September 6, 2010 Author Report Share Posted September 6, 2010 updated bom. also this which is real sweet, but needs a slight bit more work and then some testing. The only shuntregulator i know of that won't blow up without a load. http://gilmore.chem.northwestern.edu/shuntregulator.pdf Quote Link to comment Share on other sites More sharing options...
wink Posted September 6, 2010 Report Share Posted September 6, 2010 There is one problem for those outside tie US with Mouser. They do not supply ixys sand. So, unless a group buy by someone in the US happens, we outsiders will have to source the components from elsewhere. Quote Link to comment Share on other sites More sharing options...
cetoole Posted September 6, 2010 Report Share Posted September 6, 2010 IMaybe once I've moved out of my stupid apartment with its 30A main fuse that I blow once a week, to a place with a decent power supply, then I'll consider getting a drill press and going crazy. I feel your pain, I have a single 20A breaker for my apartment. I have a drill press, I just have to make sure I turn everything else off to use it. The heatgun makes my lights flicker, and I can't heat anything in the microwave while the TV and AC are on. Quote Link to comment Share on other sites More sharing options...
spritzer Posted September 6, 2010 Report Share Posted September 6, 2010 You guys could also switch to 230V... Quote Link to comment Share on other sites More sharing options...
MASantos Posted September 6, 2010 Report Share Posted September 6, 2010 You guys could also switch to 230V... Regarding the IXIS parts, I'm sure a EU group buy can be arranged! Oh boy, I don't even own a STAX headphone! Yet... Quote Link to comment Share on other sites More sharing options...
Nebby Posted September 6, 2010 Report Share Posted September 6, 2010 Oh boy, I don't even own a STAX headphone! Yet... Me neither.... Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted September 7, 2010 Author Report Share Posted September 7, 2010 There is one problem for those outside tie US with Mouser. They do not supply ixys sand. So, unless a group buy by someone in the US happens, we outsiders will have to source the components from elsewhere. There is a reasonable distributor, i think in england that ships worldwide and has reasonable prices. Don't remember which one, its buried in the T2 thread somewhere. Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted September 7, 2010 Report Share Posted September 7, 2010 There is one problem for those outside tie US with Mouser. They do not supply ixys sand. So, unless a group buy by someone in the US happens, we outsiders will have to source the components from elsewhere. I got mine from Future Electronics. Quote Link to comment Share on other sites More sharing options...
wink Posted September 7, 2010 Report Share Posted September 7, 2010 Yep, that's them - Future Electronics.. IXCP10M90S @ US2.20c each back in June. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted September 7, 2010 Author Report Share Posted September 7, 2010 And now i get from another distributor that the 2sa1968LS has been discontinued and i have to order from them NOW... This is getting real old real fast. Glad the board is designed for both. Was going to modify the power supply board for the 2sa1968ls because justin likes the led's... But... Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted September 7, 2010 Report Share Posted September 7, 2010 And now i get from another distributor that the 2sa1968LS has been discontinued and i have to order from them NOW... This is getting real old real fast. Glad the board is designed for both. Was going to modify the power supply board for the 2sa1968ls because justin likes the led's... But... just be careful, as I've run across some of these that didn't meet spec. and were most likely relabeled. I believe Spritzer did as well way back when. I'd insist on factory packaging and check the markings against the datasheet. Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted September 7, 2010 Report Share Posted September 7, 2010 And now i get from another distributor that the 2sa1968LS has been discontinued and i have to order from them NOW... This is getting real old real fast. Glad the board is designed for both. Was going to modify the power supply board for the 2sa1968ls because justin likes the led's... But... OMG - I've just been trawling Sanyo's various sites, and eventually found the discontinuation notice Discontinued products property Dead for good at end December 2010, with final order submissions by end September. Good job I had enough stock for the BH; and thirty odd lurking in a bag recovered from an aborted project (don't ask). Quote Link to comment Share on other sites More sharing options...
spritzer Posted September 7, 2010 Report Share Posted September 7, 2010 Welcome to the wonderful world of transistors, here one day and gone tomorrow... Quote Link to comment Share on other sites More sharing options...
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