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Chip Amps Amplifiers based on integrated circuits

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Old 13th March 2013, 07:28 PM   #1
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Default What the heck? It's less than lunch!

Just bought one of these! Yes, it's stereo, not mono. $6! Free shipping!

Why not?

Promotion TDA7297 Whi Fi Noiseless 2 0 Audio Power Amplifier Board Max 30W 30W | eBay
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Old 13th March 2013, 07:48 PM   #2
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This is a BTL class AB/B amp, not class D, note the lack of output inductors.
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Old 13th March 2013, 09:57 PM   #3
xrk971 is online now xrk971  United States
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Even so, very cute and I can see uses for them already. They probably put out some heat though. There is something wrong when a Starbucks and muffin costs more than something like this...
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Old 13th March 2013, 10:08 PM   #4
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Originally Posted by Tekko View Post
This is a BTL class AB/B amp, not class D, note the lack of output inductors.

Well, you'll have to educate me on what qualifies as a class D. And for that matter a "chip amp".

I don't think I know the difference really.

I have a Jerry's Electronics Amp too, and a Sure. I don't think there's inductors on either of those.

Mark
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Old 13th March 2013, 10:43 PM   #5
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Originally Posted by Mark2727 View Post
Well, you'll have to educate me on what qualifies as a class D. And for that matter a "chip amp".

I don't think I know the difference really.

I have a Jerry's Electronics Amp too, and a Sure. I don't think there's inductors on either of those.

Mark
Wikipedia can explain better and takes less time to type: Amplifier - Wikipedia, the free encyclopedia
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Old 13th March 2013, 11:10 PM   #6
DUG is online now DUG  Canada
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Data sheet here:

http://www.st.com/web/en/resource/te...CD00001048.pdf

16.5V 8R 2 ch 15W ea @ 10% thd

18V 8R 2 ch 14W @ 1% thd

You will need more heat sink.
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Old 13th March 2013, 11:51 PM   #7
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by Mark2727 View Post
Well, you'll have to educate me on what qualifies as a class D. And for that matter a "chip amp".

I don't think I know the difference really.

I have a Jerry's Electronics Amp too, and a Sure. I don't think there's inductors on either of those.

Mark
Jerry's is tpa3122 which is a class D and has inductors (ferrite core with wire around them, vertical deals). Small Sure 8 w board gets away with tiny ferrite bead as inductor. Bigger Sures have surface mount inductors that look like a black cube.

Class D is a pulse width modulation switching amp where the power transistor swings from on to off at switching freq usually 400 khz or up. The duration of how long it switches on controls amplitude and inductor and capacitor at output filter out the fast switching transients.
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Old 14th March 2013, 12:05 AM   #8
billyk is offline billyk  United States
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I got one; $6.00 what the heck. Put it with my foam-core TB W3881SI, hmm... need cheap PS and source.
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Old 14th March 2013, 01:58 AM   #9
gychang is offline gychang  United States
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sound impression will be greatly appreciated...
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Old 14th March 2013, 03:27 AM   #10
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Note in the diagram from Ebay it shows a 12V+ voltage and a corresponding 12V- this is a technical error. It is not a split supply.....the supplied instruction manual should clarify this....consult the datasheet that is posted here.
Don't expect true quality sound from this.....I heard somewhere that all other things equal, humans can detect THD levels above 0.5 .....this limits the bulk of the power output( >1W) above this level.


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