Driver chips for BPA300 amplifier

[Algar_emi]

Here, it is. I placed the caps the closer that I can to the power pins.
Better?

 

[AndrewT]

Hi,
I can only see polar electrolytics decoupling near the pins.
I presume the 1uF should be film types. I wonder if ceramic would do on the pins, or wouldthat lead to poor sound? Ti's datasheet seems to give no clue to preferred cap type.

 

[Algar_emi]

I was expecting to use electrolytic Panasonic FC for these small 1uF caps. 1uF Film caps will be quite big. As you said, I don't know what is the recommended cap type.

 

[Algar_emi]

Here the PCB, fresh of the etching tank. I'll do the assembly this week.

 

[AndrewT]

Hi,
1uf 0.2inch pin pitch, 7mm wide, <5mm thick. That's little bigger than 5mmdiam electro.

 

[Algar_emi]

The 1uF cap I used is the P10312-ND from Digikey. Diameter 5mm, pin pitch 2 mm. The pictures are not too scale.

 

[si_jopie0382]

well we will know the sound quality
in a moment

 

[Algar_emi]

Here the completed DRV134 PCB. It includes the input low pass filter, option of local or off-the-board output sense, L + R channels, ground plane and +/-15V supplies with CRC filters. The CRC resistors are not installed at the moment.

 

[Algar_emi]

To address the concern having the 1uF IC supplies caps to far away from the IC supply pins, I installed 0.1uF bypass caps directly at the pins. They are soldered directly in place. On the top of the picture we can also see the local output sense jumpers installed.