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Thread: PecanPi DAC -- Turn your Raspberry Pi into a High Fidelity Music Streamer / Player

  1. #1
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 230
    I'm Leo.

    Default PecanPi DAC -- Turn your Raspberry Pi into a High Fidelity Music Streamer / Player

    Meet the PecanPi DAC
    IMG_0344_1.jpg IMG_0351.jpg

    The PecanPi DAC is the only DAC for the RapsberryPi that utilized dual DACs in monaural mode. It also features true balanced dual differential output stages along with full HW digital volume control and re-clocking using a Crystek femtosecond jitter oscillator.

    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:
    • Sample Rates: Up to 192kHz
    • Bit Rates: Up to 24-bit
    • Compatible Rpi Models: 1B+, 1A+, 2B, 3B, 3B+ Zero, ZeroW
    • Optional Case Size: 125mm (5") x 125mm (5") x 70mm (2.8")
    • Bi-amp speakers by using XLR and RCA at the same time.


    Test Results:
    THD+N vs Frequency at 0dBFS (XLR)
    THD+N (XLR).jpg

    THD+N vs Level at 1kHz. (XLR)
    THD+N vs Level (XLR).JPG

    Jitter Spectrum and Noise 256k point FFT with 16 averages(XLR)
    Jitter (XLR).jpg

    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:
    • Dual parallel OPA1622s


    It can be preordered here for $224.99 (25% off) until mid May:
    https://orchardaudio.com/shop?olsPag...cts%2Fpcnp-dac
    All preorders will ship between June and August.
    Last edited by orchardaudio; 23-03-2019 at 02:40.

  2. #2
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 230
    I'm Leo.

    Default

    Link to how-to video for assembly of PecanPi DAC into optional case:

  3. #3
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 230
    I'm Leo.

    Default

    4th ofJuly sale on PecanPi products. Save up to 25%:
    www.orchardaudio.com/shop

    Sale ends Sunday.

  4. #4
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 230
    I'm Leo.

    Default

    Labor Day Sale - Up to 25% Off Through Sep. 2nd.
    https://orchardaudio.com/shop?olsPage=products

  5. #5
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 230
    I'm Leo.

    Default Ascend to the Orchard - Holiday Sale

    PecanPi - Delicious to the Ears - Holiday Sale

    Get up to 25% off:
    https://orchardaudio.com/shop?olsPage=products

  6. #6
    Join Date: Mar 2019

    Location: New Jersey, USA

    Posts: 230
    I'm Leo.

    Default

    It only happens once a season — our Pi Day Sale! Use code “piday314” at checkout on 3/14-3/15 and get $31.4 off your order.

    https://orchardaudio.com/shop?olsPage=products




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