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Chip Amps Amplifiers based on integrated circuits

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Old 22nd July 2011, 02:25 PM   #1
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Default Chinese Kits EBAY

Hello:
Someone proved these kits:

- HIFI TDA7294 x4 BTL Power amplifier AMP Board 150W+150W | eBay

- Pre-AMP Amplifier KIT Tube 6N2 SRPP Good for DIY | eBay

How do they work?

Thank you
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Old 22nd July 2011, 03:31 PM   #2
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Regarding the amplifier module (4x TDA7294) this looks like a dual bridge configuration, giving you two channels. In that case, each chip amp is handling 1/2 the load you put on the channel. This would imply about 6-8 ohms minimum for each channel - lower impedance loads will draw more current than is recommended for the chip amp and they will heat up considerably. Also, the price seems to be very low for what is on the board, so the possibility of low quality or fake parts is high.

Let me clearly state that I am saying all this only from looking at the picture of the finished amp and that I do not have any direct experience with it.

-Charlie
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Old 22nd July 2011, 05:26 PM   #3
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Dear Charlie:
Very thanks for you response. I was trying the LM3886 and it wanted to prove the TDA 7294. In my country -Argentine- it is difficult to obtain original parts. A few years ago arm a Leach low TIM amplifier and a SRPP (ECC82) preamp (Elektor circuit, line pre only) )and I want to make something new. I Listen jazz, clasic and pop music.That you recommend to me?

Greetings

Agustín
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Old 22nd July 2011, 06:15 PM   #4
Boydk is offline Boydk  Denmark
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Have tried the 6N2 buffer/preamp, it´s a killer for the price, even better if you change the tubes to russian 6N2P-EV, then you can´t buy any finished product that will give the sound, specially to your preferred genre of music :-)
And Adason, you´re wrong, it´s not only the pcb, but all components included. Real or Fake :-)

Last edited by Boydk; 22nd July 2011 at 06:17 PM.
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Old 22nd July 2011, 06:25 PM   #5
adason is offline adason  United States
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yes, I realized that, so I deleted the post
ed
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Old 22nd July 2011, 07:05 PM   #6
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Thanks to all.
I am going to prove one and then I tell them.
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