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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Kimberly B
Dallas, US
★★★★★ 4
not bad
Format: Kindle
I loved the plot of this book. The characters just didn’t have a lot of depth. The connections and “love” just weren’t communicated very well in the writing. The author didn’t write the sweet psycho trope very well at all either. Lachlan was just a mess of a character.
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Reviewed in the United States on November 17, 2023
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Carmen Alicea
San Leandro, US
★★★★★ 5
A Beta Worth Rooting For
Format: Kindle
In Spare, Violet Fox flips the omegaverse on its head, giving us a Beta heroine determined to make her mark. Joining the Beta Trials to support her sick father, she's thrown into a pack that doesn't want her, especially the possessive Alphas. But here's the twist: their sweet Omega turns out to be her scent match. Cue the angst, forbidden tension, and a slow-burn romance that will make your heart ache in the best way. Violet Fox delivers an emotional, refreshing take on the genre, proving Betas aren't "spares." They're stars.
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Reviewed in the United States on January 10, 2025
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C. Hunter
Los Angeles, US
★★★★★ 5
Beta, Alpha, Omega oh my!
Format: Kindle
Omegas are precious and given to Alphas & their packs... but the Betas want in too. To this end, the Beta government is rolling out its trial of assigning a Beta to each Alpha-Omega pack. But forcing a Beta into a pack where they are not wanted will not end well... Of course, no one expected the Omega to fall for the assigned Beta. Great read and cliffhanger
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Reviewed in the United States on February 15, 2025
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B. Stubby
Omaha, US
★★★★★ 3
A familiar story, just with…..less.
Format: Kindle
So, as other reviewers make clear, this is very similar to Pack Darling and The Beta. It’s much closer aligned with The Beta, in plot and maybe more like Pack Darling with characters. That being said, I don’t hate this…..but it wasn’t great either. It’s both books mentioned but just….less. Less angst, less emotion, less feeling. The plot feels very half fleshed out, and the “bad guy” feels underwhelming. I didn’t really feel any real emotions from and of the male leads, except maybe Oliver. The others fell sorta flat for me. And Mika makes herself out to be this big bad ass straight outta training and then we never see it from here again with the one fitting room incident as the exception. SPOILER: The whole, “Oh, I’m actually probably an Omega, but I don’t wanna be but I do actually wanna be but no one can ever know my secret that I do nothing to hide “ thing fell so flat. She never commutes to believing she was secretly an omega, but also mentions her “secret” a lot. It just felt so manufactured. I’m intrigued enough to read part 2 and see how the author closes everything out, but this is not one I’ll recommend or ever come back to.
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Reviewed in the United States on February 13, 2024
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Ruth Ann Burt
Bozeman, US
★★★★★ 5
Great book
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I absolutely feel in love with all 4 characters!!! The bedroom scenes were 🌋🌡🔥🔥🔥. I couldn't put this book down!!! I'm hooked for the whole series Book 2 here I come!!!!! Its a fun easy book and story to read!!
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