Hi everyone This might be a very easy question to answer.
I doing a BT speaker with BT connection as so many befor me, the problem is that it seems thta the utput from the BT module is to high.
What happens is that if I turn down the volume on the phone almost al the way down everything is fine. But as soon as I turn the volume a little up there alot of distortion.
The setup is
BT module : CSR8645 APT-X Bluetooth 4.0 Audio ( its this one )
Power to BT module L7812 LM7812 12V
Battery 18 V li ion
Class D TPA3116D2 Class D Digital Amplifier Board 2x50W Dual Channel Stereo 12v-24V
How do I turn down the signal from the BT module (a simple resistor sounds too easy ;-) )
I doing a BT speaker with BT connection as so many befor me, the problem is that it seems thta the utput from the BT module is to high.
What happens is that if I turn down the volume on the phone almost al the way down everything is fine. But as soon as I turn the volume a little up there alot of distortion.
The setup is
BT module : CSR8645 APT-X Bluetooth 4.0 Audio ( its this one )
Power to BT module L7812 LM7812 12V
Battery 18 V li ion
Class D TPA3116D2 Class D Digital Amplifier Board 2x50W Dual Channel Stereo 12v-24V
How do I turn down the signal from the BT module (a simple resistor sounds too easy ;-) )
Most pre-amp type audio circuits today use OP-AMPs. Really good OP-AMPs can drive 600 Ohm, ordinary ones 2-3 KOhm.
If you design your resistive voltage divider such that the two resistors in series have 5-10 KOhm, you will be fine.
TPA3116 likes a low source impedance. Therefore if you use a potentiometer, use 5 KOhm (4K7).
If you design your resistive voltage divider such that the two resistors in series have 5-10 KOhm, you will be fine.
TPA3116 likes a low source impedance. Therefore if you use a potentiometer, use 5 KOhm (4K7).
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