SKU: 46227414659

Preamp Power Supply

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Description

Preamp Power SupplyThe Preamp Power Supply provides a 12 V output and can source up to 650 mA. This Power Supply features ultra low output noise which makes it an ideal power supply for preamplifiers, headphone amplifiers, and phono stages. The ultra low noise 12 V output is also perfect for the Purifi 1ET400A Hypex NC500 Input Buffer and Purifi Hypex amplifier modules. Technical Documentation Design Documentation Description Features Specifications Circuit Topology

The Preamp Power Supply provides a ±12 V output and can source up to 650 mA. This Power Supply features ultra-low output noise which makes it an ideal power supply for preamplifiers, headphone amplifiers, and phono stages. The ultra-low noise ±12 V output is also perfect for the Purifi 1ET400A / Hypex NC500 Input Buffer and Purifi/Hypex amplifier modules.  

Technical Documentation

  • Description
  • Features
  • Specifications
  • Circuit Topology
  • Performance Graphs
  • The input to the Preamp Power Supply connects directly to the mains, and is compatible with the mains voltages and frequencies used across the world. The Preamp Power Supply is internally fused. In addition to the internal fuse, it is recommended to use a fused IEC power inlet. Doing so reduces the mains wiring to two wires which are trivial to connect.

    In addition to the main ±12 V output, the Preamp Power Supply provides an always-on, +5 V auxiliary power supply. This supply is intended for use with micro controllers and supervisory circuits, and can supply up to 80 mA. 

    The Preamp Power Supply features a +12 V compatible trigger output. This output is short-circuit protected and is capable of supplying 100 mA. This output is intended for remote control of power amplifiers, though, it is equally useful as the power supply for a relay-based input selector.

    The power on/off control is provided by an on-board, low-voltage control circuit. The control circuitry supports the use of both momentary ("doorbell") switches and toggle switches. This allows the use of the many anti-vandal switches, that are popular in DIY audio circles, as a power switch for the Preamp Power Supply. 

    In addition to the power switch, the Preamp Power Supply can be controlled by an external 12 V trigger. This is an attractive option when the supply is used to power the small-signal circuits of a power amplifier such as the opamps in the Purifi and Hypex Class D amplifiers. The 12 V trigger is opto-isolated which prevents ground loops.

    The Preamp Power Supply is protected against overload. This includes over-current and over-temperature protection on all outputs.

    To indicate the ON and STANDBY states, the Preamp Power Supply provides two LED outputs. Each output is equipped with a dimmer, which allows you to adjust the LED brightness to suite your taste. The dimmers work by pulse-width modulating the LEDs at a frequency well above the audio band. Unlike other solutions, pulse-width modulation works even with white and blue LEDs without changing the colour of the light emitted by the LED. The LED outputs on the Preamp Power Supply are compatible with both individual LEDs and with bi-colour LEDs (both 2-pin and 3-pin types).

    The Preamp Power Supply module is made in Canada. The two-layer, gold plated PCB is made in Toronto and assembled in Calgary. 

  • The Preamp Power Supply has the following features:

    • Fixed ±12 V @ ±650 mA output. 
    • Ultra-low output noise and output impedance.
    • Mains voltage input with support for worldwide mains voltages and frequencies.
    • Integrated power control circuitry which supports the use of low-voltage switches, such as the anti-vandal switches popular with DIYers.
    • Support for both momentary (doorbell) and toggle switches for power control.
    • Built-in over-current and over-temperature protection on all outputs. 
    • LED indication of ON and STANDBY states with support for bi-colour LEDs (both 2-pin and 3-pin types).
    • Dual LED dimmer.
    • 12 V compatible trigger output with 100 mA current limit for remote control of power amplifiers.
    • 12 V, opto-isolated trigger input.
    • 5 V @ 50 mA always-on auxiliary power supply.
    • Rising cage clamp output terminals supporting wires up to AWG 16 (1.5 mm2) in size.
    • Compact 55 × 108 mm footprint. Fits within a 1U chassis height, including safety clearances.
    • Two-layer, gold plated PCB.
    • Made in Canada.
  • The specifications for the Preamp Power Supply are tabulated below. 

    Parameter Value Notes
    Output Voltage ±12 V ±2.5 %
    Output Current ±650 mA (Note 1)
    Output Noise, Positive Rail 20 µV RMS 20 Hz – 20 kHz
    Output Noise, Negative Rail 13 µV RMS 20 Hz – 20 kHz
    Output Impedance, Positive Rail < 20 mΩ
    20 Hz – 80 kHz
    Output Impedance, Negative Rail < 70 mΩ 20 Hz – 80 kHz
    Line Regulation, Positive Rail -107 dB

    Line Regulation, Negative Rail -110 dB

    Load Regulation, Positive Rail -69.3 dB
    (0.03 %)

    Load Regulation, Negative Rail -59.9 dB
    (0.10 %)

    Auxiliary Output Voltage +5 V ±5 %
    Auxiliary Output Current 80 mA
    Trigger Output Voltage +11.3 V ±5 %
    Trigger Output Current 100 mA
    Trigger Input Voltage Range 6 – 16 V
    Mains Input Voltage 85 – 264 VAC
    Mains Input Frequency 47 – 63 Hz
    Standby Power Consumption 0.3 W
    120 VAC
    Mechanical Dimensions 108 × 54.6 × 27.6 mm ±0.5 mm (Note 2)
    Weight 95 g

    Note 1: For best performance, the main output should be loaded symmetrically by at least ±25 mA. The sum of the positive load current, trigger output current, and auxiliary output current should not exceed 670 mA.

    Note 2: A 6.4 mm safety clearance is needed from the longest component pin to the chassis. Thus, I recommend using 10 mm standoffs with the Preamp Power Supply.

  • The block diagram of the Preamp Power Supply is shown below.

    The main ±12 V output is provided by a pair of ultra-low noise linear voltage regulators from Texas Instruments. The Power Control circuit controls the two linear regulators to allow for a smooth power-up and power-down.

    All outputs of the Preamp Power Supply are protected against over-current. All regulators and the current limiter are protected against over-temperature as well. If the main output is accidentally short-circuited, the power supply will simply power down. 

  • The graphs below show the measurements of the prototype build of the Preamp Power Supply. The final version will likely perform slightly better.

    The output impedance of the ±12 V output is shown below.


    As seen in the graph the output impedance of the Preamp Power Supply is very low. It is near 1 mΩ mid-band for the positive output and below 70 mΩ within the frequency range of 20 Hz – 80 kHz. The positive output has lower output impedance as the positive regulator is a tad better than the negative.

    The graph below shows the output noise of the ±12 V output of the Preamp Power Supply.


    The output noise spectrum is completely free of rectifier and mains components. Only a minuscule amount of switching noise is present, and only on the negative output. The integrated noise measures 20 µV and 13 µV for the positive and negative outputs, respectively, within the frequency range of 20 Hz – 20 kHz.

    Transient Response

    While the performance under steady-state conditions are important, it is also important that the power supply responds gracefully to load transients. The plots below show the change in the positive and negative output, respectively, as the load current is increased from 10 mA to 600 mA in a fast step.

    As the graphs show, the Preamp Power Supply responds cleanly without any tendency to ringing or overshoot.

Shipping Notes
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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: 46227414659

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Christine Franzone
New York, US
★★★★★ 5
Exteremly comfortable
Color: Dark Black
Reasonably priced, very comfortable l, easy assembly
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
J
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James F Evans
Pawtucket, US
★★★★★ 5
Surprisingly amazing chair!
Color: Pink, Color: Pink
tl;dr: If you need a chair that has the features of this one, then this one is a winner! Hits above its weight class for sure. My wife is 5’. She’s small. For whatever reason she ended up with a chair made for big people, like 6+ feet and up to 500lbs type of a chair. She’d often even sleep on it and chill on it. The chair was big enough to fit 2 of her to be honest. It was an expensive chair that I won at some raffle and didn’t like myself. Over the years it ripped (got a cover for it) and even started to get lopsided (from the sleeping) and finally a spring broke (hence the pillow on it in the pictures) She obviously lives pink. I also wanted to get a chair where she could work and not end ip asleep on. Not like we have a couch or a bed for that 😂. This chair is very obviously smaller than her previous chair, it’s also significantly cheaper in price and build, it’s also not as durable feeling or stable, and it’s just not as padded. Yet somehow it’s an amazing chair that we both like better than her previous chair??? Like it’s crazy that this chair somehow works better in so many ways. Her desk is modified to be shorter than normal desks (again, she small lol) and her previous chair was just too big. The wheels are also like SUPER smooth, like you can run a chair race easily with it. It rolls over her rug and tucks into her desk (which is in our bedroom) easily. The amount of space this has save us when the chair isn’t being used is a lot. Previous chair was much bigger and didn’t tuck in at all. The color is nice and the padding is plenty for a small and much lighter than 500lbs woman. I’m 6 feet and 200 lbs and the chair is nice for me as well. My chair is bigger and more secure in the backing, which is similar to this one. The lowest tension setting on my chair is still too high for her to lean back on my chair. This chair has a lower tension minimum and she can easily lean back freely, as well as keep enough tension to work without sagging. This chair is surprisingly outstanding! I’m sure my wife will destroy it quicker than the last one, but it’s so cheap that even if it only lasts 1-3 years, I’ll happily buy it ones or twice more 🤷🏽‍♀️. Maybe by then they’ll invent a comfortable titanium chair that’s affordable that she won’t destroy 😂.
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Reviewed in the United States on February 28, 2024
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Rebecca Olmos
Phoenix, US
★★★★★ 3
Mid.
Color: Light Purple
The chair is fine, and reasonably easy to put together. However, I've been using it for a little over a year and a half, and it's already falling apart. Random parts of it have fallen off, which is fine because it was still functional. But now the most frustrating part is that the wheels continue to pop off, and while the first attempts to pop them back on worked, they will not stay on now. This is obviously greatly impacting the stability, and I will need to purchase a replacement soon. For this price and lack of long-term durability, I would not buy again.
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Reviewed in the United States on January 4, 2026
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Bridgett Kelly Rode
San Leandro, US
★★★★★ 5
Alexa messed me up, but the company of the chair made it right!
Color: Light Purple, Color: Light Purple
I wanted something small with arms that moved out of the way when I wanted to slide my chair all the way into my desk for more space. This fit the bill. I loved the color blue and I had that in my cart for a bit. One day Alexa mentioned that an item that was in my cart was on sale. It was the chair. I let it be ordered. When it came it didn't exactly look blue to me. But I kept putting it together thinking maybe it was the lighting in the room I was assembling it in. I brought it to my craft room and lo and behold it is light purple. I looked at my order and sure enough it said light purple. Boo! I looked in my saved cart and the chair was gone. So I accepted it for an error. The next day I checked to see if I could return it. Thought I could, till I read that I would have to pay to return it. So I wrote the seller to tell them to ignore the return. And that was that. Till a couple days later I get an email from the seller asking if I would like a full refund or a replacement at no cost. I was like heck yeah send me the blue one. I was thrilled and I wanted to thank the seller for doing this without the return of the other chair. But I could not find a place to do that now. So here is where I will thank you. Thank you so much for doing this for me. You guys are AWESOME!. I love the chair and I love the blue color. I find it very comfortable, lite, easy to adjust, the size works great for me, and for the price the quality fits my needs. I do hope it lasts me for quite some time. Thanks again!
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Reviewed in the United States on January 9, 2026
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Steve in Florida
Draper, US
★★★★★ 5
Awesome chair definitely recommend
Color: Blue, Color: Blue
It was amazing the color was spot on and it was very very easy to put together and the size is amazing for my 11 year old daughter maybe not for an older person it doesn’t recline as much as it says so if you want a reclining chair maybe I don’t recommend this chair but the quality is amazing and the adjustment capability is incredible the noise level is at 0 it is an amazing chair we just got it so I don’t know so much about the dupability so if you want this chair for a child or a tween maybe even a teen easy to put together beautiful blue color this is the chair for you.
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Reviewed in the United States on March 21, 2026

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