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Chip Amps Amplifiers based on integrated circuits

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Old 2nd February 2013, 12:41 PM   #11
JMFahey is offline JMFahey  Argentina
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Fully agree, if you have 12V, use a TDA2003.
But follow the schematic suggested in the TDA2003 datasheet, which adds a couple extra parts (Zobel network for stability) and suggest a PCB layout.
Even if you build it on perfboard, you can roughly use it as a guide.
You'll need to bolt it to a heatsink, which may be as simple as a piece of flat aluminum .
NOTE: THE PIN NUMBERS SHOWN IN YOUR "8W" SCHEMATIC ARE WRONG.
FOLLOW WHAT THE TDA2003 DATASHEET SUGGESTS.
http://www.st.com/internet/com/TECHN...CD00000123.pdf
The components labelled Rx and Cx are not needed.
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Old 3rd February 2013, 01:57 AM   #12
docd is offline docd  Canada
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The test circuit you mean? What about the tda2003a (digikey has them in stock)? I took a look at the typical application schematic and they look identical to me.
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Old 3rd February 2013, 07:08 AM   #13
JMFahey is offline JMFahey  Argentina
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Yes, TDA2003"A" is probably an "improved" or whatever version.
Must be fully equivalent or they would have used a different number.
Use the schematic in Figure 16 in the ST datasheet.
As you see, Cx and Rx are greyed out because they are optional and really nobody uses them.
In Fig 17 you have a PCB or layout suggestion.
I'm using something very similar for background music with my PC.
100000000000 times better sound than the typical "200W (PMPO) PC Speaker" with the 2" cheesy speakers.
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Old 3rd February 2013, 08:34 AM   #14
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Hi Lm324's are no use as thumb tacks . The pins keep bending

Quote:
Originally Posted by stratus46 View Post
LM324s are best used as multi-pin thumb tacks. There is not one redeeming quality of those chips, except as thumb tacks. Of course I could be wrong.

G
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Old 3rd February 2013, 02:26 PM   #15
JMFahey is offline JMFahey  Argentina
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Quote:
There is not one redeeming quality of those chips,
Maybe not as audio preamps, but they are a Godsend in Industrial Electronics.
I also use them a lot (really LM358, which is the Dual version) in my amps in various sensing circuits; thermal muting, thermal tracking variable speed fans, controlling relays to avoid turn on thumps and protecting speakers from DC, etc.
And they are excellent as DC servos and autobiasing circuits for MosFets.
EDIT: just in case you think "all that can be done by any regular Op Amp", the answer is no: they are happy with the 5v *single rail* supply available for the Logic chips, input voltage can reach 0V (in a single supply situation) , in fact even 0.6V *below* 0 V , are low power by design, and output can reach *almost^* 0V under the same constraints.
Very useful little chaps.
Did I mention that $1 buys 5 of them?

Last edited by JMFahey; 3rd February 2013 at 02:31 PM.
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