Hi everyone,
I'm testing on a breadboard a TDA7297 based design, very similiar to the one found on the datasheet, the only problems is that I can't use two distinct ground paths, one for power ground, and the other one for the signal ground, where is connected the input ground signal and the signal path of an headphones amplifier, the problem is when I mount the amplifier in this configuration it begins oscillating. It only works with power and signal ground tied together, I've also tried to connect directly the input ground to the supply capacitors but without any success. The headphones amplifier don't have a good behaviour when is signal ground is directly connected to the power supply ground without any connection to input ground. If I connected the signal ground of the headphones amplifier to the signal ground of the TDA7297 I have signal injection in both amplifiers, with TDA7375V this doesn't happens because the two ground are distinct but I got problems due to instabilities.
If I use the STA540 I can solve this two problems?
I've also told to build this amplifier on pcb layout but I don't no anything about pcb layout, and I'm afraid that I can't complete this project.
Thank you very much for your atention,
Best regards,
Daniel Almeida
I'm testing on a breadboard a TDA7297 based design, very similiar to the one found on the datasheet, the only problems is that I can't use two distinct ground paths, one for power ground, and the other one for the signal ground, where is connected the input ground signal and the signal path of an headphones amplifier, the problem is when I mount the amplifier in this configuration it begins oscillating. It only works with power and signal ground tied together, I've also tried to connect directly the input ground to the supply capacitors but without any success. The headphones amplifier don't have a good behaviour when is signal ground is directly connected to the power supply ground without any connection to input ground. If I connected the signal ground of the headphones amplifier to the signal ground of the TDA7297 I have signal injection in both amplifiers, with TDA7375V this doesn't happens because the two ground are distinct but I got problems due to instabilities.
If I use the STA540 I can solve this two problems?
I've also told to build this amplifier on pcb layout but I don't no anything about pcb layout, and I'm afraid that I can't complete this project.
Thank you very much for your atention,
Best regards,
Daniel Almeida