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I am wondering if I can roll opamp from this device. How did you galvanically isolate the DAC the streamer?

How many amp does this setup need?

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13 minutes ago, pjmcos said:

I am wondering if I can roll opamp from this device. How did you galvanically isolate the DAC the streamer?

How many amp does this setup need?

 

The DAC is not galvanically isolated from the RaspberryPI.

 

Can you please elaborate on your other questions, I am not sure what you are asking.

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On 3/17/2019 at 3:47 PM, orchardaudio said:

 

The DAC is not galvanically isolated from the RaspberryPI.

 

There are companies that sell isolators if you are interested in that sort of thing.

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How did you achieve such parameters with just one board? A competitor from Allo uses 3 to 4 separate boards! Where is the difference? How does it compare in terms of actual sound quality?

 

Will it work with Kodi (LibreELEC)?

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6 hours ago, Joe09876 said:

How did you achieve such parameters with just one board? A competitor from Allo uses 3 to 4 separate boards! Where is the difference? How does it compare in terms of actual sound quality?

 

Will it work with Kodi (LibreELEC)?

 

It will work with Kodi, it uses the existing Rpi-DAC driver.

 

The specs are achieved by using high quality component, a high quality gold plated PCB with very good dielectric, and also with proper layout techniques by keeping digital and analog sections of the board from overlapping. Below are the implementation details.

Implementation Details:

  • DAC chips:  
    • Dual flagship Burr-Brown PCM1794As in monaural mode
  • Digital HW Volume Control and Re-clocking:
    • Crystek CCHD-575 oscillator -- ultra low clock jitter of 82fSec
    • SRC4193 for volume control
  • Output stage: True balanced dual different output stages
    • Uses OPA1612s
    • Low Noise Panasonic Resistors
    • Proprietary filtering topology
  • Ultra low noise analog power supplies:
    • TPS7A4700 (4.17uV noise) for positive op-amp power supply
    • TPS7A3301 (16uV noise) for negative op-amp power supply
    • TPS7A4901 (15.4uV noise) for DAC Chips
  • Headphone driver:

The sound quality is very good, but I cannot compare it to other products you will have to make that determinations yourself, as everybody has different tastes. 

 

There are two more reviews that will be coming out shortly from https://hifipig.com/ and https://theaudiophileman.com/

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On 3/17/2019 at 7:47 PM, orchardaudio said:

 

The DAC is not galvanically isolated from the RaspberryPI.

 

Can you please elaborate on your other questions, I am not sure what you are asking.

I mean.. how many opamps do this device have?

Can the DAC side be powered separately?

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Yes DAC can be powered separately, there is a jumper that you can remove to allow powering the Pi individually.

 

There are a total of 16 op-amps, in 8 packages. Two opamps per package.

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Specifications for XLR Output:

  • Signal to Noise Ratio (SNR): 130dB (A-weighted)
  • Dynamic Range (DNR): 125dB
  • Total Harmonic Distortion + Noise (THD+N): -110dB or 0.0003%
  • Output Voltage: 5Vrms

Specifications for RCA Output:

  • Signal to Noise Ratio (SNR): 127dB (A-weighted)
  • Dynamic Range (DNR): 121dB
  • Total Harmonic Distortion + Noise (THD+N): -110dB or 0.0003%
  • Output Voltage: 2.5Vrms

Specifications for Headphone Amplifier:

  • 390mW peak power into 32 ohms
  • 780mW peak power into 16 ohms

 General Specifications:

  • Sampling Rates: Up to 192kHz
  • Bit Rates: Up to 24-bit
  • Size: 125mm (5") x 125mm (5") x 70mm (2.8")

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