Electronic noise between BTM98 and TDA3116

[Tore]

Hi,
I have a question about my electronic project. I have two circuits: one is a bluetooth receiver based on BTM98 chip that works a 12V and the other is a Class D amplifier based on TDA3116 chip that works better at 19 V. If I connect both circuits to the same power supply, I hear a strange electronic noise from the speakers. The power supply uses switching technology and it is of low quality. However, if I use another power supply of high quality the behaviour is the same. This problem is solved in two cases: if I use a power supply of high quality and I provide energy from two different independent source channels and if I use two different power supplies, even if they are of low quality. It seems that there is a sort of electronic coupling between the two circuits. What do you suggest to do? I'm considering to buy a new power supply as the Huntkey HKA06519034-6J 19V 3.42A 65W. I need 1 A on 12 V and at least 3 A on 19 V.
Thank you

[Author]

Posts