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Old 19th February 2011, 08:01 PM   #1
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Default ebay amps

hey guys i'm interasted about buying this amp from ebay 2PC TDA8920 BTL 2.0 Audio Amplifier AMP Kit 200W+200W - eBay (item 260708920904 end time Mar-16-11 01:10:07 PDT)

but there is not much information about it. i need your help to know if i can hook up 6 ohm speakers or only 8 ohm and do i get the 200watt rms at 8 ohm , have anyone used one of this amps, are they solid, isn't the heatisnk too small( will adding a cooling fen help ) , why there r 4 outputs while it says 2x200 watt and isnt too cheap for a 2x200watt amp(becouse i see other amps with less wattage aer the same price or more...)

or even this one theres not much information too


http://cgi.ebay.com/TDA7294-BTL-Speakers-Protected-KIT-Audio-Amp-150W-2-/260701348286?pt=LH_DefaultDomain_0&hash=item3cb302 e1be
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Old 19th February 2011, 08:29 PM   #2
Spiny is offline Spiny  United Kingdom
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the data sheet gives 10% THD at 140 watts into 8ohms

Mono bridge-tied load configuration
output power
RL = 4 W; THD = 10%; VP = 17 V; 110 - Watt
RL = 8 W; THD = 10%; VP = 25 V; 140 - Watt
I'd take the Ebay figures with a pinch of salt

Heat sink is probably OK as this is a class D amp and presumably efficient.
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Old 19th February 2011, 09:03 PM   #3
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It won't be so cheap once you add a transformer and case.......

From the questions you are asking, you might be better with a 'finished' amp instead of a diy project?
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Old 20th February 2011, 12:11 AM   #4
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thanks very much now the things are more clear to me so it works like a mono bridge, i asked for transformer and ok it's ac 20v or ac 22v but how do i know if its 10A or what wattage can it deliver.
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Old 20th February 2011, 09:12 AM   #5
Spiny is offline Spiny  United Kingdom
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they recommend 20-0-20 AC 10 A that would be 400 watt, Transformers are rated in VA (Volt Amps) they are similar, an expert will explain the difference, however you will need a 20-0-20 VAC at 400 to 500va to drive this.
Don't forget the casing, power switch, fuses and fuse holders etc.
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Old 20th February 2011, 12:07 PM   #6
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i think i dont need fuses ? dont i just need a transformer to power up this amp?
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Old 20th February 2011, 12:20 PM   #7
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also i wrote them a message on ebay asking do i need only transformer to power it up and they said yes, the heatsink is on the board.
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Old 20th February 2011, 05:38 PM   #8
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Quote:
Originally Posted by aleks990 View Post
i think i dont need fuses ? dont i just need a transformer to power up this amp?
You should stop and learn a few electricity basics before you hurt yourself.
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Old 20th February 2011, 11:09 PM   #9
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dont worry i know what the fuse is for its for the electricity form the transformet not to burn the amp
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