SKU: 71746605640

Universal Purifi Input Buffer

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Description

Universal Purifi Input BufferThis input buffer is designed for the following Purifi and Hypex Class D amplifier modules: 1ET400A, 1ET6525SA, 1ET7040SA, 1ET9040BA, and NC500. Key advantages: Fully differential output for full power, even with a single ended source. Controlled common mode voltage to prevent power supply bus pumping. Four independent ultra low noise voltage regulators for analog and digital power. Get the best performance from your Purifi and Hypex modules with this

This input buffer is designed for the following Purifi and Hypex Class D amplifier modules: 1ET400A, 1ET6525SA, 1ET7040SA, 1ET9040BA, and NC500.

Key advantages:

  • Fully differential output for full power, even with a single-ended source.
  • Controlled common-mode voltage to prevent power supply bus pumping.
  • Four independent ultra low-noise voltage regulators for analog and digital power.

Get the best performance from your Purifi and Hypex modules with this input buffer.

Technical Documentation

  • Description
  • Specifications
  • Circuit Topology
  • The buffer is a single-channel (mono) buffer, with the following features:

    • Differential (balanced, XLR) input, which can easily be configured for single-ended (unbalanced, RCA) operation.
    • Fully differential output even when used with a single-ended source. 
    • Common-mode feedback ensures zero common-mode output voltage to avoid power supply bus pumping.
    • Jumper-selectable gain: 11.6 dB, 13.0 dB, and 13.2 dB for a total amplifier gain of 26.0 dB when used with the Purifi Class D modules. 
    • Gain can be further customized by adding a resistor (1206 size SMD and leaded/PTH supported) or set to unity gain (0 dB).
    • Plug-and-play connection with Hypex SMPS1200 power supply.
    • Four ultra low-noise voltage regulators power the analog and digital circuits of the Buffer and the amplifier module. Optionally, you can add the Hypex HPR/HNR regulators.
    • Speaker output is provided on 6.3 × 0.81 mm quick-connect spades and a terminal block accepting up to AWG 10 (5.2 mm2) in size.

    In addition, the following options are provided for advanced users:

    • By adding a resistor and a 7-pin connector, the amplifier module can be operated in software mode. See the relevant amplifier module data sheet for details. 
    • The buffer can be disabled by removing two resistors. A 3-pin connector footprint provides direct access to the input of the amplifier module.

    The Universal Purifi Input Buffer circuit board is fully assembled, RoHS compliant, and is designed and manufactured in Canada.

  • The full specifications for the Universal Purifi Input Buffer are tabulated below.

    Parameter Value Notes
    Quiescent Power Supply Current
    20 mA
    27 mA
    Nominal
    Maximum
    Maximum Power Supply Current
    47 mA Zload = 1.5 kΩ, +25 dBu
    THD -140 dBc
    (0.00001 %)
    1 kHz, Vin = 2.0 V RMS
    THD -130 dBc
    (0.00003 %)
    20 kHz, Vin = 2.0 V RMS
    THD+N < -120 dB
    (< 0.0001 %)
    1 kHz, Vin = 2.0 V RMS
    THD+N < -120 dB
    (< 0.0001 %)
    1 kHz, Vout = 9.6 V RMS
    IMD: SMPTE 60 Hz + 7 kHz @ 4:1 -112 dB
    Vin = 2.0 V RMS
    IMD: DFD 18 kHz + 19 kHz @ 1:1 -122 dB
    Vin = 2.0 V RMS
    Multi-Tone IMD Residual < -148 dB Ref.: 7.6 V RMS AP 32-tone, Vin = 2.0 V RMS
    Gain 0 dB (1.00×)
    11.6 dB (3.80×)
    13.0 dB (4.47×)
    13.2 dB (4.57×)
    Can be further customized by resistor option.
    Gain Flatness ±0.007 dB 20 Hz - 20 kHz
    Bandwidth DC – 900 kHz 100 mV RMS, -3 dB
    Slew Rate ±21 V/µs Fully symmetric 
    Common-Mode Rejection Ratio (CMRR)

    ≥ 80 dB

    20 Hz - 20 kHz, typical

    Total Integrated Noise and Residual Mains Hum

    2.5 µV RMS (11.6 dB)

    1.5 µV RMS (0 dB)

    20 Hz - 20 kHz, A-weighted
    Total Integrated Noise and Residual Mains Hum

    3.1 µV RMS (11.6 dB)

    1.9 µV RMS (0 dB)

    20 Hz - 20 kHz, Unweighted
    Dynamic Range (AES17) 132 dB Vin = 8 V RMS
    Input Impedance 48 kΩ
    Module dimensions and weight

    64 × 84 × 28 mm

    45 g

    (W × D × H)

     

    All parameters are measured at an auxiliary power supply voltage of ±20 V, 1.5 kΩ differential load impedance, differential input, and 11.6 dB gain unless otherwise noted.

    The specifications were measured on the prototype and should be considered the typical performonce the Universal Purifi Input Buffer. The specifications should not be considered a guarantee and may be changed at any time without notice.

    Sound Quality

    I designed the Universal Purifi Input Buffer to be sonically transparent and firmly believe I have achieved that goal. I generally prefer precise amplifiers as they render the source material naturally, without any colouration, and offer a spacious and realistic sound stage. This aligns well with the design philosophy of Purifi and Hypex as well.

  • A simplified block diagram of the Universal Purifi Input Buffer is shown below.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 71746605640

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Altairjones
Pawtucket, US
★★★★★ 3
I’m a little disappointed.
Format: Kindle
I usually like Jillian West’s books but this one was missing a lot for me. The pregnancy didn’t come across as real. She’s on her feet for 12 hour days but is perfectly healthy at 8 months pregnant? Yet the week she moves in all of a sudden she’s not? She is planning on actually running during one of the plot buildups. But at 8 months pregnant that’s incredibly hard to do. The lack of breathing ability and lung space, the change in body center, mass, and gravity. All of it prohibits running, unless you’re an athlete this didn’t come off as at all realistic. I didn’t feel any connection with the alphas. There wasn’t any emotional connection. It could be because of the tense it was written in. But I didn’t get any deep feelings out of this. It came across as checking off boxes. Even the spicy scenes weren’t really believable for me. I wanted to see them fall for her, and it just kind of all fizzled. Even Bishop. One thing I did really like was the ending. I did not see it coming and I’m interested in reading book two because of it. But on the whole this book was mostly disappointing for me.
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Reviewed in the United States on March 16, 2024
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Melissa Williams
Port Orchard, US
★★★★★ 4
4.25 stars
Format: Kindle
Vale is an 8 month pregnant omega working as a waitress at a strip club and a cam girl. She starts to get very creepy vibes from a regular at the club, and her baby daddy ghosted her. She has had an online relationship with a man named Bishop through her cam girl status. One night, bishop was paying to watch her sleep and ansthe creepy regular Andrew break in and watch her sleep he tells vale to come to him at his business now. She flees and finds herself at a large security company with some.hot of alphas who are there to help her. This imegaverse is a little different than I have read, but I am thoroughly enjoying it. Vale is not a traditional omega she was raised by a single beta mom, and the alphas are not normal alphas they have never really loved pack life. But they are ruthless mercenaries. They need her, and she needs them. I love the aspect of the stalker and now the plot twists at the end, so so good. Sometimes, it seemed a little slow and stale mated, but since this a duet, I think It was just her starting to have Vale get to know her alpha suitors. Cliffhanger for sure with this one.
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Reviewed in the United States on September 9, 2024
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Austin & Cambria
Battle Creek, US
★★★★★ 5
That ending 😫
Format: Kindle
I fell into a false sense of security and really thought this was gearing towards a happy ending. Then I realized there’s no work they don’t punish Andrew. I really liked Vale’s character. I don’t normally read books with pregnancy but going into this knowing she was pregnant made it more enjoyable for me. I loved Bishops devotion to her and her happiness. I also loved that Holt and Mercy couldn’t fight their attraction to her. I love scent matches so very much. I’m so curious to see how this duet will end up. And I need to pay more attention and notice that a book I’m starting is a duet to begin with lol
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Reviewed in the United States on February 21, 2025
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Sarah A
Dallas, US
★★★★★ 5
oh wow
Format: Kindle
I just knew there was something about Cooper! I’m wondering if he’s about to be included but damn I’m glad he’s at least not a rapist and creepy guy, he just got called on assignment and had to go! This should be interesting! She’s gonna run and then what’s his face is gonna grab her. I’m worried! Wow that was a great book and cliffhanger! Loving this!
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Reviewed in the United States on December 27, 2025
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Ashley Morgan
Lake Worth, US
★★★★★ 5
ABSOLUTELY A MUST for Omegaverse Girls!!!
I ABSOLUTELY LOVE Jillian West and her books!!! I’m so happy I already bought book two and now I have to buy the others for the Assurance Security series!! Not gonna lie Val kind of annoyed me at the beginning but she grew on me!! Her men are chef’s kisses!!! Holt annoys me some but I can let it slide. I already bought part two so I’m going to be reading that in between work phone calls!!!! DON’T TELL MY BOSS 😂😂😂😂
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Reviewed in the United States on September 30, 2025

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