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2016-05-05 15:31 <arossdotme> what do you think of this pcb design: http://www.aliexpress.com/item/Finished-HIFI-SA1-TAS5630-stereo-amplifier-class-D-amp-300W-2-AD872-preamp-sn/32433899004.html?ws_ab_test=searchweb201556_0,searchweb201602_2_10017_10034_10021_507_10022_10032_10020_10009_10008_10018_10019,searchweb201603_6&btsid=cff1ee80-0558-4d54-a7dc-273adea26e0b
2016-05-05 15:31 <arossdotme> photos of just the pcb: http://www.aliexpress.com/item/Dual-Channel-2x-300W-TAS5630-Class-D-Digital-Audio-Amplifier-Board-HIFI-AD827-100-New-Free/32327412523.html
2016-05-05 15:32 <arossdotme> compared to: http://www.aliexpress.com/item/High-Power-Amplifier-TAS5630-OPA1632DR-300W-300W-Stereo-Class-D-Audio-Power-Amp-Amplifier/2018214665.html?ws_ab_test=searchweb201556_0,searchweb201602_2_10017_10034_10021_507_10022_10032_10020_10009_10008_10018_10019,searchweb201603_6&btsid=993f7336-1762-44b3-bd4f-5130b75bf710
2016-05-05 15:32 <arossdotme> no box pcb design: http://www.aliexpress.com/item/TAS5630-power-digital-amplifier-board-300W-2-free-shipping/1581574057.html?ws_ab_test=searchweb201556_0,searchweb201602_2_10017_10034_10021_507_10022_10032_10020_10009_10008_10018_10019,searchweb201603_6&btsid=320148f8-3b96-47bf-a7fd-76511c5d402d
2016-05-05 15:33 <arossdotme> both use the same TI audio power amplifier IC. they use different pre-amp IC’s
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2016-05-05 18:17 <DocScrutinizer05> arossdotme: wire to speaker terminals in first one look flimsy
2016-05-05 18:23 <DocScrutinizer05> second one looks way better design - the input are farther away from the speaker terminals and it seems they got the preamp directly behind the inpout jacks, not on other end of main PCB like first one
2016-05-05 18:24 <DocScrutinizer05> I'd go for second one for sure, even when it's 30 bucks more
2016-05-05 18:24 <arossdotme> ok.
2016-05-05 18:24 <DocScrutinizer05> however keep in mind you need a stable powerful 40V supply
2016-05-05 18:25 <DocScrutinizer05> (or 25V, or higher)
2016-05-05 18:26 <arossdotme> my dilemma was i like the case, connectors look more robust and easier too. and the vol pot was not on the same pcb. arr well i guess if i really want i can make my own case with the board only version of the 2rd one :)
2016-05-05 18:27 <arossdotme> yea the power supply issue.....
2016-05-05 18:28 <arossdotme> i have a 400w stepup dc-dc converter. i found it can give double the input voltage.
2016-05-05 18:28 <arossdotme> i also have a 100w boost converter too. that seams able to do 3x the input :). hmm.
2016-05-05 18:29 <arossdotme> its min in voltage is 3.somethingV wheres my 400w one is 8v
2016-05-05 18:30 <arossdotme> i heard that one can get multiable PSUs and wire the DC in seriels to get a bigger voltage :), dad said to make sure the dc ground is not connected mains earth.
2016-05-05 18:31 <arossdotme> or i would just by a mains one if i rally want.
2016-05-05 18:31 <arossdotme> my use for it it so power one 150w peak PA speaker i was given.
2016-05-05 18:31 <arossdotme> I assume the amp will be ok if one speaker is no connected ?
2016-05-05 18:32 <arossdotme> *(so i want around 75w constant). its a 8ohm speaker too.
2016-05-05 18:37 <arossdotme> i thought this amp would be easier. instead of  http://www.yuan-jing.com/irs2092-class-d-mono-amplifier-board-200w  a with  http://www.yuan-jing.com/Voltage-Converter/12v-to-32v-dc-to-dc-converter-board-a to power it. as i looks like i would need to mount the mosfes on big heatsink urrgg. it would work well of a 12v batt though... mmh
2016-05-05 18:39 <arossdotme> also sure make a board mono board for this the 2x150ishW version of the TI IC http://store3.sure-electronics.com/1-x-300-watt-class-d-audio-amplifier-board-tas5613
2016-05-05 18:40 <arossdotme> which has the advantage of only needing 36V in i think it was. only a few £ bewteen the 300w mono TI and 300w 2x TI. hmm arrgh what to do?...
2016-05-05 18:40 <arossdotme> what do you think of the sure mono board?
2016-05-05 18:41 <arossdotme> no pre-amp on the sure one
2016-05-05 18:41 <arossdotme> http://www.banggood.com/400W-CNC-Digital-DC-DC-Boost-Module-Constant-Voltage-Constant-Current-p-946745.html
2016-05-05 18:47 <DocScrutinizer05> you want DC input power?
2016-05-05 18:55 <DocScrutinizer05> the sure thing... well it has a fan. Though that makes sense, I don't really like fans
2016-05-05 18:56 <DocScrutinizer05> can't say much about it, except it's not even listing specs for 8Ohm load, which doesn't mean 8Ohm won't work, just that the supposed 300W for sure won't be available
2016-05-05 18:58 <DocScrutinizer05> it also doesn't list THD at a more reasonable operation point, like 200W. Despite this would be a way more relevant data.  10% THD are unbearable (except for max load, which you're not supposed to use on a regualr basis during everyday operation anyway)
2016-05-05 19:01 <DocScrutinizer05> http://www.aliexpress.com/item/High-Power-Amplifier-TAS5630-OPA1632DR-300W-300W-Stereo-Class-D-Audio-Power-Amp-Amplifier/2018214665.html?ws_ab_test=searchweb201556_0,searchweb201602_2_10017_10034_10021_507_10022_10032_10020_10009_10008_10018_10019,searchweb201603_6&btsid=993f7336-1762-44b3-bd4f-5130b75bf710  is sort of shitty design too, the heatsink inside case can not get rid of the heat since no ventilation slots in the case
2016-05-05 19:01 <DocScrutinizer05> above the heatsink
2016-05-05 19:02 <DocScrutinizer05> for operating the device small side down, the heatsink's wings are wrong orientation
2016-05-05 19:03 <DocScrutinizer05> and I *hate* all aliexpress pages since you can't c&p the text they have
2016-05-05 19:04 <DocScrutinizer05> anyway efficiency 88% which means 300W*0.12 = 36W the heatsink must dissipate
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2016-05-05 19:05 <DocScrutinizer05> you probably should operate that thing without the upper lid, just like shown on the webpage ;-)
2016-05-05 19:06 <DocScrutinizer05> oooh wait, that's a 300+300W, so make that 72W, nooooo way
2016-05-05 19:06 <DocScrutinizer05> with that heatsink no way
2016-05-05 19:08 <DocScrutinizer05> of course you can ignore all this as long as you don't actually use the thing to drive your speakers at constant high power
2016-05-05 19:09 <DocScrutinizer05> and you'd be surprised how little difference in volume you notice between N Watts and N/10 Watts
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2016-05-05 19:10 <DocScrutinizer05> I'd guess that device can actually do a 100W continuous
2016-05-05 19:11 <arossdotme> yea im not keen about the fan also meh
2016-05-05 19:11 <arossdotme> dc input pwr yes
2016-05-05 19:11 <arossdotme> batts, etc
2016-05-05 19:11 <DocScrutinizer05> then get enough voltage from the batts, way better than boost converter
2016-05-05 19:11 <arossdotme> i expect half of 300w. according to the TI datasheet
2016-05-05 19:12 <DocScrutinizer05> ooh china Watts
2016-05-05 19:12 <DocScrutinizer05> I see
2016-05-05 19:12 <arossdotme> 300w into 4ohm
2016-05-05 19:12 <DocScrutinizer05> whatever, cya - dinner
2016-05-05 19:12 <arossdotme> k got dog wall too
2016-05-05 19:12 <arossdotme> thanks muchly
2016-05-05 19:13 <DocScrutinizer05> yw
2016-05-05 19:13 <arossdotme> with the TI chips the THD goes bad to the 10% when its clipping anyway :)
2016-05-05 19:13 <arossdotme> I dont expet to use full watts out
2016-05-05 19:13 <DocScrutinizer05> a last funny note: I *love* tiny reed contacts, make nice stealth switches in cables
2016-05-05 19:13 <arossdotme> expect
2016-05-05 19:15 <arossdotme> btw this is the manufacture of them http://www.yuan-jing.com/ClassD-T/tas5630-class-d-stereo-amplifier-board-300w-300w-delux
2016-05-05 19:16 <arossdotme> thanks for the heatshink, info. very educational :)
2016-05-05 19:19 <arossdotme> got this from them, but its noise floor is really suckly. bitty/gritty blips. http://www.yuan-jing.com/lm1036-audio-tuning-board-delux-version
2016-05-05 19:19 <arossdotme> :(
2016-05-05 19:20 <arossdotme> they make this board designed by audiopiles from diyaudio.com http://www.yuan-jing.com/tpa3116-class-d-2-0-stereo-amplifier-board-50w-50w
2016-05-05 19:22 <arossdotme> TAS5630 2x300w without heatshink version : https://www.yuan-jing.com/tas5630-class-d-stereo-amplifier-board-300w-300w?search=TAS5630
2016-05-05 19:22 <arossdotme> tiny reed contacts for stealth switches in cables? trying to picture that... :/
2016-05-05 19:25 <arossdotme> but for the fan (urrg) heatsink what did you think of the sure board other wise? i think it was ok
2016-05-05 19:25 <DocScrutinizer05> yep
2016-05-05 19:25 <arossdotme> they do a stereo version but with no pre-amp :(
2016-05-05 19:25 <DocScrutinizer05> though... see above
2016-05-05 19:25 <arossdotme> k
2016-05-05 19:26 <arossdotme> oh ok. i thought i was for both... ok i see
2016-05-05 19:28 <arossdotme> see ya, been great
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2016-05-05 20:53 <DocScrutinizer51> arossdotme: (reed) a glass tube with axial contaxts. possibly as small as qwmm long and 2.7mm diameter
2016-05-05 20:53 <DocScrutinizer51> there are way smaller ones too
2016-05-05 20:55 <DocScrutinizer51> 12mm long
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2016-05-05 21:39 <limpkin> hey gents....  out of curioisity, is werner's here? and what's his nick? :)
2016-05-05 21:44 <arossdotme> DocScrutinizer51, and stealth switches in cables? what application would you use them for?
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