#qi-hardware IRC log for Tuesday, 2016-05-10

whitequarkwow, kubuntu is hideously slow00:11
whitequarkit takes 10 minutes to boot on my ssd for some moronic reason00:11
whitequarkoh, just needed more RAM... 768MB not enough00:14
whitequarkDocScrutinizer05: http://fehu.whitequark.org/files/kubuntulol.gif00:37
whitequarkkubuntu boots in text mode but renders graphics into the framebuffer for some bizarre reason00:37
whitequarkthats the weirdest glitch i've seen in a while00:37
whitequarkDocScrutinizer05: ok you're in luck cuz i found how to fix it01:17
whitequarkDocScrutinizer05: do this (from build dir): git checkout .. ; git pull ; make ; ./src/solvespace01:22
whitequarkshould be fixed now01:22
DocScrutinizer05wow, yes02:05
whitequarkyes to what?02:13
arossdotmehmm been looking at the datasheets again of the tas5630 and tk2050... hmmm tas5630 isnt as good as tpa3116 THD wise. the tas5630 thd+noise shoots up around 150w from 0.1% to 1% 200w and then for the last 100w its 1%-10% urggh me thinks. hmm15:15
arossdotmei see now what you mean, tas5630 isnt really a 300w amp cus buy that point its not sounding so good15:19
DocScrutinizer05so call it a 150W amp15:19
arossdotmeyea :)15:20
DocScrutinizer05iirc decent HiFidelity amps from the analog age were speced at 0.1% THD or less at rated power15:21
arossdotmeoh right15:21
DocScrutinizer05like "80W RMS at 4Ohm, 0.1% THD"15:22
DocScrutinizer05the went into like 50% THD shortly after that, which isn't a nice thing either15:23
DocScrutinizer05generally you never want to operate an amp at rated power15:24
arossdotmeurrgh 50% icky 15:24
arossdotmehm hmm hmm15:24
DocScrutinizer05but at least it shouldn't escape blue magic smoke when you do15:25
arossdotmeheh :D15:25
arossdotmei see more why diyaudio.com people where keen about tpa3116. cus its at rated power below or upto 0.1%15:25
DocScrutinizer05then came China and PMOP or whatever the term, like "this amp *could* deliver 200W, for 1 microsecond, to an ideal zero Ohm speaker, when you operate it on 500V mains and give it thicker internal wiring"15:26
DocScrutinizer05silly little circuits size of a matchbox were suddenly tagged "50W"15:28
arossdotmei havent see that thankfuly in my young, recent years of looking at amps15:29
DocScrutinizer055.1 sets for a 100 bucks were suddenly "400W"15:29
DocScrutinizer05despite having a mains fuse of only 0.5A15:29
arossdotmeThe reason im buying amp boards is so then i know what chip im getting and so (depending on the quality of the components) i know what specs i should be getting thanks to the datasheet!15:30
arossdotmeinstead of depending on marketing description, or perception reviews15:31
arossdotmealso so then i can have the amps battery powered. thanks a huge reason :D15:31
arossdotmeim trying to understand how this does 300w into 4ohm or 150w into 8ohm when the datasheet graph for parrell outputs doesnt go that high. the graph is also marked at being for 30Vin wheres hifimediy say 48Vin15:38
arossdotmelooks like the tas5630 is better, and i think more efficient15:39
arossdotmebetter = lower THD?15:39
arossdotmei have a http://hifimediy.com/amplifiers/diy-amplifiers/T1-M-amplifier which runs hoter and his a higher current draw then the tpa3116 but it does have slightly or a little lower noise floor15:42
arossdotmeno his=has15:42
arossdotmetk2050 was a early class-d chip15:43
--- Wed May 11 201600:00

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