Analog audio input into dsp/ power supply / quality of components

Hi Daniel,

I managed to successfully set up the dac+ dsp board on my 3b+ and run an rew filter which sends the results via toslink to an external dac. Concerning this setup I have three questions:

1) Can I feed the pi and the board with seperate power inputs? I would like to bend away the three GPIO pins on the pi and feed the board with a seperate 5v 3a sbooster power brick. Is this possible and if so, where to solder it to the board?

2) I would like to feed the audio signal of my pre-amplified phono-signal through the DSP. Can I simply connect it to the P4 terminal on the board and can I keep using the same rew filter that is already running on the board?

3) What kind of components concerning the digital signal are on the board? Is it the same quality components as on the Digi+ Pro? I'm a layman and I might have gotten some things wrong but I'm talking about the processing of the digital signal that is sent out through the toslink port. Is it of the same quality, especially with regard to signal timing, as on the Digi+ Pro board?

Thank you!

Tomislav

HiFiBerry team March 28, 2019 18:00

Hi,

the quality of an audio circuit can't be simply judged by its components. There also isn't always a "better" or "worse", but much more often "different". The design of the DAC+ DSP is completely different than the design of the Digi+ Pro. Feel free to listen to both and check if you hear any difference.

The DAC+ DSP isn't designed to be powered by an external power supply and I can't recommend this. There is no need for this.

There is no analogue audio input on the DAC+ DSP. P4 isn't a ADC designed for audio, but for controls. For an audio input, you would require a separate add-on board. We'll should have this ready for beta testers soon:
https://www.hifiberry.com/blog/more-channels/

Best regards,
Daniel

Analog audio input into dsp/ power supply / quality of components

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