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new budget system

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ostrichmilkman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ostrichmilkman Quote  Post ReplyReply Direct Link To This Post Topic: new budget system
    Posted: 19 January 2017 at 3:07am
hey guys

been a while since i was last on here

just moved out to Australia and had to leave my beloved boom box behind and its making me sad. 


thinking of building a new one but on a pretty serious budget this time. 

thinking the cheapest way would be to just buy some old hifi speakers and nick the drivers and crossovers out of them and probably use a sla 12v battery for power

the question is, what amp should i use ? is the old lepai ta2020 still my best bet ?

found this on ausi ebay that seems to fit the bill but its worryingly cheap and im wandering if anyone can vouch for it or if anyone knows of a decent cheap amp board that will run a couple of bookshelves. or even a mono amp that would just run one but really well. ??? 


probably a much asked question but any advice would be mega appreaciated 

cheers guys 
work like a dog party like animal
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ostrichmilkman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ostrichmilkman Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2017 at 3:25am
liking the look of this bad boy


any knowledge on how the ta2021 stacks up against the ta2020 ?

also could do with some help getting my head around 

A: making a circuit that will automatically turn off the system when the voltage drops too low
 
B: being able to charge and use the boom box at the same time without interference, (thinking of making it solar powered at some point)


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Ganon View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ganon Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2017 at 10:08am
Dont know if they ship to Aus, but take a look at Accusafe's products, they have a battery protect board, and a maxamp, that uses less then ta2020 and gives more watt.
And it's tiny, really tiny.
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ostrichmilkman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ostrichmilkman Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2017 at 2:21am
Awesome ill have a look mate cheers
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ostrichmilkman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ostrichmilkman Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2017 at 2:22am
Awesome ill have a pool cheers. Have you heard it in use what sort of drivers was it running ???
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Ganon View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ganon Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2017 at 8:08am
I have tested it on Electro Voice sx200, and that sounded good, i have it put up to some Argon hifi speakers at my work, and that sound pretty good aswell, many people use it in the boominator.
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bitSmasher View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bitSmasher Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2017 at 9:09am
"Battery Acid Sound System" blog hopefully happening in 2017
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slaz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote slaz Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2017 at 11:34am
Originally posted by bitSmasher bitSmasher wrote:

Jaycar have a couple of options for battery cut-out,


Don't know anything about that unit - but IMHO its preferable to just build in a cheapie voltmeter and monitor the battery voltage manually ..... (much cheaper also).

If your battery is anything other than in perfect nick - it will have a significant internal resistance - which in turn means voltage will drop on a heavy bass note/kick drum/other peak in signal - which might well trigger the cut-off when the battery still has useable capacity.
REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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ostrichmilkman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ostrichmilkman Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2017 at 6:23pm
As you say in the past i just opted for a volt meter so I may well just do that l. Hadn't thought about that its a good point and another reason to just stick with the cheaper option.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote slaz Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2017 at 6:36pm
Some of those digital numeric displays can consume up to 20-30 mA - which doesn't sound much - but it could easily be as much as the idle current of a class D chip-amp.

On my best setup I have a momentary-contact microswitch to only enable the VM on the fly.

REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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