ebay amps

aleks990 · 19th February 2011, 08:01 PM

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

Spiny · 19th February 2011, 08:29 PM

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.

VictoriaGuy · 19th February 2011, 09:03 PM

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?

aleks990 · 20th February 2011, 12:11 AM

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.

Spiny · 20th February 2011, 09:12 AM

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.

aleks990 · 20th February 2011, 12:07 PM

i think i dont need fuses ? dont i just need a transformer to power up this amp?

aleks990 · 20th February 2011, 12:20 PM

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.

VictoriaGuy · 20th February 2011, 05:38 PM

Quote:

Originally Posted by aleks990

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.

aleks990 · 20th February 2011, 11:09 PM

dont worry i know what the fuse is for

its for the electricity form the transformet not to burn the amp

19th February 2011, 08:01 PM	#1
aleks990 diyAudio Member Join Date: Jan 2011	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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19th February 2011, 08:29 PM	#2
Spiny diyAudio Member Join Date: Feb 2008	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.

19th February 2011, 09:03 PM	#3
VictoriaGuy diyAudio Member Join Date: Dec 2008 Location: Victoria, BC	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?

20th February 2011, 12:11 AM	#4
aleks990 diyAudio Member Join Date: Jan 2011	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.

20th February 2011, 09:12 AM	#5
Spiny diyAudio Member Join Date: Feb 2008	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.

20th February 2011, 12:07 PM	#6
aleks990 diyAudio Member Join Date: Jan 2011	i think i dont need fuses ? dont i just need a transformer to power up this amp?

20th February 2011, 12:20 PM	#7
aleks990 diyAudio Member Join Date: Jan 2011	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.

20th February 2011, 11:09 PM	#9
aleks990 diyAudio Member Join Date: Jan 2011	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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