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Old 30th December 2004, 08:33 AM   #1
benje is offline benje  United Kingdom
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Default TDA 7294 Use it or go LM3886

hello people,

I did have until yesterday a working JVC stereo, however the CD section failed, so I decided to take it apart, and to my surprise it uses two TDA7294 in its amplifier section.

I was just wondering, as I dont like to throw things away, whether to use the Transformer for a LM3886 project or just modify the existing JVC board and use the TDA7294's instead. Has anyone tested the two side by side? What is the cleanest sounding one?

Let me know your opinions

Cheers

Ben
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Old 30th December 2004, 09:32 AM   #2
mb is offline mb
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Just one person's opinion: since it's there, tune the h*ll out of it and be surprised what it delivers. IMO it has just about as much potential as the LM38xx chips for clean, musical sound. Give it lots of power supply capacitance, good local bypass and try Carlos' snubbers at the chip end, including snubbers for the compensation cap pins.
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Old 30th December 2004, 09:47 AM   #3
benje is offline benje  United Kingdom
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Well it sounded quite good when it was part of the JVC system. However there appears to be minmal filtering of the PSU, just a couple of 2200uF caps, you recommend to improve this some how? what capacitance should I be looking at ideally?

Cheers

ben
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Old 30th December 2004, 09:56 AM   #4
benje is offline benje  United Kingdom
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By the way if anyone is interested here are some pictures of the JVC board and its layout:

Picture 1

Picture 2

Picture 3

Picture 4

Picture 5

Picture 6

Picture 7

Picture 8
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Old 30th December 2004, 10:20 AM   #5
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nice layout on the board, id use it, just add more caps for the power supply and the snubbers described else where, include the small ceramics across the diode bridge.

it should be easy enough to find the points for speaker conection and input, but my experiance is that intergrated amps need buffering when you take them out of the original system. that isnt to much of a worry as there should be a transformer tap for the cd player that you can use to power the buffer and/or any tone controle.

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Old 7th January 2005, 03:28 AM   #6
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I have some out of an old sharp stereo.

I say, with the ones you found, use em if you got em.

I wonder why the TDA7294 isn't as popular as the LM3886?
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Old 8th January 2005, 07:45 PM   #7
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Quote:
I wonder why the TDA7294 isn't as popular as the LM3886?
Maybe because you can't get free samples of TDA's
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