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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Works well keeps my hair soft the whole day
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Reviewed in the United States on September 4, 2025
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Size: 4 Fl Oz (Pack of 1), Unit Count: 4.0
Much easier to use than the jar, I hope it works as well. After 6 weeks, Well my hair is exactly the same. No regrowth on my edges and my hair is not healthier. It’s just a basic hair oil. Will not repurchase
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Ornella Daly
Carnegie, US
★★★★★ 5
It works!
Scent: Smoky coffee, Size: 4 Fl Oz (Pack of 1)
There is a strong smell or roasted coffee beans but since I started using this product my edges are healthier and the hair at the middle of my head that has been struggling to grow is gaining some length. The product itself can get hard depending on the temperature of your room but if you use it as directed the texture isnt so bad. The oil is thick and not very greasy or difficult to wash away. Definitely effective. 100% will recommend.
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TL
Pawtucket, US
★★★★★ 5
It's Working
Scent: Smoky coffee, Size: 4 Fl Oz (Pack of 1)
I like how it softens and protect hair. I am using sparingly on my scalp and have not used enough to see hair growth yet. I have had it for a month but do not use daily. I am growing my grey hair out and I have noticed that some of the white hairs are more salt and pepper now so it naturally darkens hair. My friend who told me about the product has been using it longer and her grey hairs are pretty much unnoticed by the natural darkening effect, blending enough to give her a light brown look. I have extremely fine thin fragile hair so I leave it on instead of rinsing or washing it out per instructions, that is another reason I do not use daily on hair and scalp. So far I have not had any negative side effects by using sparingly and leaving in until weekly wash. There is a strong smokey smell but not overwhelming for me and the scent dicipates within an hour or less.so I am not bothered by it. After using product on my hair, I rub a little on my nails & cuticles. It appears to help, as my cuticles are a lot healthier now.
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Bstew
Phoenix, US
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Ash vs. Moisture/Success?
Scent: Smoky coffee, Size: 4 Fl Oz (Pack of 1)
The product feels great on the skin and moisturizes well. Although, don't be fooled by the smokey coffee detail. I'm an avid expresso bean grinder and drinker, this is no coffee. Smells like strong chain smokers favorite corner of the house on a stressful day. Imagine ash trays and Jojoba blended. Now that that's explained, it genuinely feels great on the skin/beard/scalp. Unfortunately, I am unsure how long my wife will tolerate this as a nighttime routine.
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