ProtoDAC TDA1387 X8 project

[hifinet]

The caps I have are consistent with the data sheet. 

10uf 63V:  L = 31.5, H = 20.5, W = 11.5

6.8uf 100V:  L = 31.5, H = 23.5, W = 13.5

I'm curious, if you moved the row of holes/pads for the output caps 1-1.5mm inward toward the DAC chip on the side of the GPIO connector, would the assymetry vs the other side lead to capacitance or inductance issues? that offset would make it easier to make sure the 'red box' caps would have the little nibs on the corners sit on the pcb surface with that cap being more stable. Potentially it would make mounting the MKP equivalents difficult. I'm probably over-thinking this.

In any case, thanks for the new Gerbers.

Skip

It's good to know that the dimensions match up with the data sheet. But, looking at this MKT data sheet, the 10uF 63V polyester is the same size. I guess the markings on the cap. Ultimately, it's how it sounds. I think the sonic signatures of PETP, PC and PP are fairly distinctive.

I think you are correct about the PCB design. I designed the PCB before I had access to the WIMA 6.8uF red caps, and it used dimensions based on a similar value PP cap in the EasyEDA library. It does look that it would barely fit and clear the inner GPIO pins with 0.5-1mm to spare. Another factor was that the dimensions of the module were slightly bigger (by 0.5-1mm in length) than the DIP28 dimensions in the program. I needed to adjust the space for the C3/C4 caps. You can fiddle with EasyEDA for hours, with refinement after refinement. This was my first design with EasyEDA. At some point I just had enough. I doubt anyone could hear the asymmetry.