#qi-hardware IRC log for Saturday, 2016-10-08

DocScrutinizer05arossdotme: I'd use a class-D amp for that, and such amp should be pretty much voltage tolerant on power supply per definitionem. I don't think those 15V are to be taken serious when using a class-D04:57
DocScrutinizer05also a LiIon battery has 4.2V pretty much only during charging. As soon as you draw some jiuce from it, it drops to 4.1 and 4.05 pretty quickly04:59
DocScrutinizer05but honestly, what the heck?? 500Watts?05:01
DocScrutinizer05that's plain madness for battery powered. Simply because you can't move the speaker for that even with a sack cart05:02
arossdotmeDocScrutinizer05, it is a class d amp. i was looking at using car amps but they have this bloody 16v limit :(11:32
arossdotmea alpine one :)11:32
arossdotmearr i never measured a liion for when in use V drop. inserting11:33
arossdotmeheh yea 500w is my limit cus the battery size just gets massive and run time not so much11:34
arossdotmeits for a alpine subwoofer11:34
arossdotmebeen looking at irs2092 amps  and i think ive found one that can use the 45v +/-DC as that is the max output of the only dc to +/- duel dc boost converter (happens to be also designed for audio amps) that i can find11:36
arossdotmethis is the one, looks like it is/has mono/bridge output? https://www.aliexpress.com/item/DIY-HIFI-Amplifier-V1-0-IRAUD350-700W-4ohm-Mono-Audio-Power-Amplifier-board-Class-D-AMP/32698223625.html?ws_ab_test=searchweb0_0,searchweb201602_1_10056_10065_10068_10055_10054_112_10069_10059_110_111_10073_10017_10071_109_10070_108_10060_10061_10052_10062_10053_10050_10051,searchweb201603_6&btsid=342b64d0-44a8-487c-842b-5d68cd23c95011:40
arossdotmemanufacture page https://www.yuan-jing.com/irs2092-class-d-mono-amplifier-board-350w-350w?search=irs209211:41
arossdotmeheh inserting=interesting11:44
arossdotmeboost: https://www.aliexpress.com/item/500W-single-DC-DC12V-positive-and-negative-double-DC-45V-boost-power-supply-board-adjustable-pressure/32712054819.html?ws_ab_test=searchweb0_0,searchweb201602_1,searchweb201603_6&btsid=28a4982a-0533-4316-bdcc-23c25189fae111:59
arossdotmeso with that irs amp board, i am also trying to work out if the ac is rectified, if so then i can power it from +/-DC directly12:00
arossdotmethen again those amp boards dont look too good: http://www.diyaudio.com/forums/class-d/284655-iraud200-short-story.html13:43
arossdotmelooks like the ac is rectified, looks like those large rectangular things are rectifiers16:22
arossdotmearrrgh idk what to do16:22
arossdotmetheres this very nice board http://www.audiophonics.fr/en/amplifier-boards/irs2092-stereo-class-d-amplifier-2x-200w-4-ohms-p-7128.html16:23
arossdotmewith prober doc16:23
arossdotmebut the car amp which looks like it is as good, 2rd hand is £4016:23
arossdotmebut the 16v max limit where with the board i get to chose a pwr supply that works for me16:24
arossdotmemy lion batt is around 300WH so maybe instead of trying to have something that works with the batts i have i should buy the car amp and get a lifepo4 batt using the £60 i saved :)16:25
arossdotmethat is to say get a batt with 500WH min :)16:26
arossdotmeknow of any lifepo4 distributors in the uk or Europe?18:17
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