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Old 24th May 2012, 05:24 PM   #1
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Default Stereo amp with TDA7293

I built one of these amps some years about with the parallel mode boards from jamesaudio but sold them after the amp sat unused for some time.

In a week or two i will be building one again, i have two TDA7293 left from a set i bought on ebay back in 2005-2006

At first i was gonna P2P wire them, but realized a board on ebay is just 6 dollars so i went ahead and bought one.

Where would you place the TDA7293, better than the LM3886 or worse ? Good overall or just a waste of time ?

The TDA7293 does seem to have more "audiophile" and "High End" aura over it though, judging from the kits on various web sites.
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Old 24th May 2012, 05:36 PM   #2
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Do check the boards thoroughly. I have a 6 dollar 7293/7294 combo board where e.g one of the zener diodes is drawn the wrong way round (for the powersupply of the NE5532 (?)) and iirc some resistor values are a little different from what I'd pick (around the uPC1237, I use a 24V relais, but I think there were some other values that didn't make sense).

If your board says NE5532 + TDA7297/93 then you have the same board.

Last edited by ric-paul; 24th May 2012 at 05:39 PM.
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Old 24th May 2012, 05:49 PM   #3
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It's the XY board, same seller as the XY LM3886 kit i sold. It has provisions for the mini preamp but i am not going to use that as i don't need it.

This one: http://www.ebay.com/itm/220781981871...#ht_1716wt_880

Last edited by Tekko; 24th May 2012 at 05:52 PM.
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Old 24th May 2012, 05:55 PM   #4
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Old 25th May 2012, 06:46 AM   #5
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Originally Posted by kuldeepsingh View Post
"The point of life is to build atleast one audio amplifier before you die. " - I agree 101%
What package are you doing your layout on, BTW. They look nice, though I haven't, TBH, really examined them thoroughly. Is there a thread here covering what you have done so far.
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Old 25th May 2012, 06:59 AM   #6
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Originally Posted by Tekko View Post
It's the XY board,
This one: DIY TDA7293 amplifier AMP BOARD PCB | eBay
OK, different board and you are going to look at it carefully anyway not having a schematic I guess. Good price BTW.
Mine's a copy of taoboa or something board ($6, no free shipping and the accompanying schematic is for a different board ), my bridged TDA7293/4 board from my same seller ($10, free ship.) does say XY on it.

Have fun building!
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Old 25th May 2012, 07:30 AM   #7
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These boards known for having errors in them ?
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Old 25th May 2012, 07:33 AM   #8
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Originally Posted by Tekko View Post
These boards known for having errors in them ?
I'd doubt it. They couldn't get away with that for long. Maybe something on the silk screen, but there's not much to get wrong on that in this instance, is there? Anyway you'll have to go through it carefully because they are not sending you a schematic apparently. That's probably a good discipline anyway.
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Old 25th May 2012, 07:42 AM   #9
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Well it looks like most of these chipamp boards are based off the "typical application example" circuit in the datasheet.

But why do they show a 22F feedback capacitor ? This gives almost no bass response what so ever.

In my opinion 100F is absolute minimum and is what i'll use on mine.

That jamesaudio parallel TDA7293 amp i built back in 2006 had almost no bass at all due to this low value feedback cap.
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Old 25th May 2012, 08:35 AM   #10
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Originally Posted by Tekko View Post
Where would you place the TDA7293, better than the LM3886 or worse ? Good overall or just a waste of time ?

The TDA7293 does seem to have more "audiophile" and "High End" aura over it though, judging from the kits on various web sites.
Better than NS offerings by many aspects , among others
the mosfet output stage.
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