A few posts ago, I think I sketched out a 2A3 amp I was working on. First the reference material:
http://www.circuitcellar.com/microchip2007/winners/MT2209.html (design is VERY different from mine, the key items are the SMPS and the file formats for source code and schematics...) http://www.jensen-transformers.com/as/as088.pdf http://cinemag.biz/line_input/line_input.html http://cinemag.biz/line_input/CMLI-15-15B.pdf http://edcorusa.com/products/transformers/cxpp/cxpp50-8-3_4k.html (I might custom order a pair with a smaller core to keep the size of the amp down...) http://scottbecker.net/tube/sheets/049/2/2A3.pdf http://scottbecker.net/tube/sheets/093/6/6SL7GT.pdf http://scottbecker.net/tube/sheets/137/6/6SN7GTA.pdf First issue is the tubes, but then nobody cares about tubes so we'll simply mention it and move on... Second issue are the transformers and the complex AF features of them such as bandwidth and frequency dependent phase delay.... This brings up a critical issue with the simulator. Right now it attempts to do an instant-by instant approimation. This gives it a frequency ceiling of 1khz... =\ To go further, it needs to be able to switch to static analysis techniques to approximate filter responses clear out to 200khz or so. Furthermore, it needs to be able to compute general parameters of frequencies all the way into RF. -- this is critical to the SMPS design... Morgan Jones (no on-line reference, I'm aware of), uses voltage regulators all over the place to drop as much as 150 volts off the B+ rail for the voltage gain and driver of his amp... =P The power supply for the amp I'm thinking of needs a 300V B+ rail, a secondary B+ rail at around 150v, a B- rail of -300v (maybe even -350v!), three separate 6.3v supplies, and four monster-current 2.5v supplies... So that's like 10 supplies, or maybe 9 and and absurdly tall regulator, not to mention the startup ordering required to safely bring up the very expensive output tubes... (they need to be warmed up and the B+ should be brought up slowly...) Conventional SMPS design software only allows you to specify voltages up to a pathetic 100v! =( sad. So a major benchmark for the Ktechlab simulator will be the ability to simulate any of the major SMPS topologies and come with reference designs for PFC input and DC-DC converters with output voltages all the way up to 1.5 KV. First, however, we need to design and implement the new parts library. =( -- New president: Here we go again... Chemistry.com: A total rip-off. Powers are not rights. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Ktechlab-devel mailing list Ktechlab-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ktechlab-devel
