After some success with my TDA1517 amplifier circuit, I decided to try the TDA1519C. I breadboarded both the stereo and the BTL sample circuits on page 10 of the attached datasheet. In both cases, I could hear the audio signal faintly in the speaker(s), but there was very loud and irregular popping noise. The popping would stop only when I decreased the input voltage to an extremely low level. As I increased the input, the popping would get louder and more frequent, but still had no discernable pattern. I tried it with two different IC's and got the same results.

Any ideas what the problem might have been?

 

Did you remember to include the 100μF cap across the power supply line and GND?

 

Did you remember to include the 100μF cap across the power supply line and GND?

I had a 1000 μF and a .22 μF across the power leads. In fact, I used the same basic setup as shown in post 5 of this thread http://forum.allaboutcircuits.com/showthread.php? (except for the appropriate changes in the output wiring.)