Tag Archives: closeup

HiFiBerry – preview


HiFiBerry is an addon-board for the Raspberry Pi. It will be connected to the board by USB. You can add it directly or using an external USB cable. To connect it directly to the USB port, the USB jack and the audio and video jacks have to be removed.

The PCB design for the HiFiBerry version 1 is almost finished. Due to the limited space, there will be no SPDIF in and out connection on the board. There is some space left for a pin header for these ports.

The circuit uses an external power regulator to provide the best possible audio quality. The audio chip is a PCM2906 which is known for its good audio quality.


These capacitors look cool

roe-eyf-06Today I found a pair of NOS[ref]new old stock – components that were produced sometime in the past, but were not used yet[/ref] ROE EYF 06 electrolytic capacitors. After measuring them I was lucky to see, that they still have full capacity (4800uF and 4700uF). And wow – these things look great! The gold color will look great on a black PCB. I’m thinking to design a new PCB similar to the UniSieb circuit, but with these capacitors (only 6 of them will fit on a 8x10cm board, because they are quite large with 30mm diameter).

Any other ideas how to use them?

Preview: Shunt voltage regulator

shunt-r-onlyThe new PCBs for the shunt voltage regulator arrived. Now final testing starts. Unfortunately I ran out of electrolytic capacitors of the right size, therefore it will take some more days until the tests can go on.

One cool thing of about this new PCB – by just changing two jumpers you can select between 3 different quiescent currents. This makes it easy to adopt the circuit for different use cases.