diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Chip Amps (http://www.diyaudio.com/forums/chip-amps/)
-   -   What the heck? It's less than lunch! (http://www.diyaudio.com/forums/chip-amps/231988-what-heck-its-less-than-lunch.html)

Mark2727 13th March 2013 07:28 PM

What the heck? It's less than lunch!
 
Just bought one of these! Yes, it's stereo, not mono. $6! Free shipping!

Why not? :cool::cool::cool:

Promotion TDA7297 Whi Fi Noiseless 2 0 Audio Power Amplifier Board Max 30W 30W | eBay

Tekko 13th March 2013 07:48 PM

This is a BTL class AB/B amp, not class D, note the lack of output inductors.

xrk971 13th March 2013 09:57 PM

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...

Mark2727 13th March 2013 10:08 PM

Quote:

Originally Posted by Tekko (Post 3409370)
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

Saturnus 13th March 2013 10:43 PM

Quote:

Originally Posted by Mark2727 (Post 3409582)
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

DUG 13th March 2013 11:10 PM

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.

xrk971 13th March 2013 11:51 PM

Quote:

Originally Posted by Mark2727 (Post 3409582)
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.

billyk 14th March 2013 12:05 AM

I got one; $6.00 what the heck. Put it with my foam-core TB W3881SI, hmm... need cheap PS and source.

gychang 14th March 2013 01:58 AM

sound impression will be greatly appreciated...

Richard Ellis 14th March 2013 03:27 AM

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.


__________________________________________________ _Rick.......


All times are GMT. The time now is 10:46 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2