Hi!
I'm building myself stereo amplifier based on TDA7292 and CSR8645. My problem is that when i connect bluetooth module to amplifier there is very loud high pitch noise, similar to modem or data transfer. I power everything by IRM-60-24 and use LM317Ts to step down voltage for bluetooth and other periferials such as opamp LME47920. Once i tried lab power supply with 3 independent outputs, 24V for amplifier, 5V for transistor to activate amplifier and 3.3V for bluetooth and it was playing fine. But when i try to connect everything with IRM it is horrible. What can i do? Would it be better if i just connect 18650 battery to bluetooth? But i wanted it to run entirely on IRM-60-24 and idk what to do. Even when i used IRM only for amplifier and arduino or nucleo for 3.3 and 5V lines there was the same problem. Do you have any ideas? The sound doesn't have to be perfect at all, i just want to remove noise as cheaply and easy as possible, this whole thing is more like experiment than proper audio system.
I'm building myself stereo amplifier based on TDA7292 and CSR8645. My problem is that when i connect bluetooth module to amplifier there is very loud high pitch noise, similar to modem or data transfer. I power everything by IRM-60-24 and use LM317Ts to step down voltage for bluetooth and other periferials such as opamp LME47920. Once i tried lab power supply with 3 independent outputs, 24V for amplifier, 5V for transistor to activate amplifier and 3.3V for bluetooth and it was playing fine. But when i try to connect everything with IRM it is horrible. What can i do? Would it be better if i just connect 18650 battery to bluetooth? But i wanted it to run entirely on IRM-60-24 and idk what to do. Even when i used IRM only for amplifier and arduino or nucleo for 3.3 and 5V lines there was the same problem. Do you have any ideas? The sound doesn't have to be perfect at all, i just want to remove noise as cheaply and easy as possible, this whole thing is more like experiment than proper audio system.