Hello.Just came to my hands a board like this.After reading the datasheet and inspecting the boards schematic i found that it has a gain of 36dB, GAIN0,GAIN1,AVCC pins are connected together and tied to Power supply voltage through a 10ohm resistor and a decoupling cap of 1uF maybe.
Output LC filters consists of 22uH coils and 1.8uF capacitors.Are theses values ok for use with 8ohm speakers?
Should an additional snubber network of 10ohms in series with 330pf cap be added from each of the class D outputs to ground?
Input capacitors are 4.7uF ,but for 36dB gain input impedance is 9K only and maybe innadequate bass responce.It also has a 1k resistor from each input to ground BEFORE the 4.7u capacitors.I think its better to replace them with something like 47K-100K.
I will change the gain to 20 OR 26 dB.can i replace input 4.7u capacitors with better quallity like MKT or wima?
Output LC filters consists of 22uH coils and 1.8uF capacitors.Are theses values ok for use with 8ohm speakers?
Should an additional snubber network of 10ohms in series with 330pf cap be added from each of the class D outputs to ground?
Input capacitors are 4.7uF ,but for 36dB gain input impedance is 9K only and maybe innadequate bass responce.It also has a 1k resistor from each input to ground BEFORE the 4.7u capacitors.I think its better to replace them with something like 47K-100K.
I will change the gain to 20 OR 26 dB.can i replace input 4.7u capacitors with better quallity like MKT or wima?
Attachments
Here are some calculations for the filters for the tpa3116/8.
Some rambling calculation on TPA3116/8 filters.
Some rambling calculation on TPA3116/8 filters.