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
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 46227414659

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Warren Norgaard
Charlottesville, US
★★★★★ 5
An Ice Cream Cone for Dogs Who Have Never Paid Taxes
Style: Frosty Cone, Size: Small (Pack of 1)
Bought this for my dog thinking it would provide “a few minutes of enrichment.” It became an event. The second I pulled this thing out of the freezer, my dog reacted like I had personally returned from a heroic quest carrying the sacred treasure of his ancestors. Absolute full-body joy. Olympic-level tail wagging. The rubber feels sturdy, the opening is easy to fill, and freezing treats inside keeps him occupied long enough for me to answer emails, drink coffee, and briefly remember who I was before becoming a full-time employee of a small furry creature. I’ve filled it with peanut butter, yogurt, treats, and one regrettable attempt involving pumpkin puree that turned my kitchen into a seasonal crime scene. Best part: it’s durable enough to survive enthusiastic chewing without immediately looking like it lost a fight with a lawn mower. Five stars. My dog now stares at the freezer with religious devotion.
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Reviewed in the United States on May 14, 2026
K
Verified Purchase
kitka82
Massapequa, US
★★★★★ 5
Great treat toy especially for frozen treats
Style: Chilly Penguin, Size: Medium/Large (Pack of 1)
This is cute! Very solid and chewable. To ensure a longer play time it does great for popping in the freezer after filling with peanut butter, yogurt, pumpkin, applesauce, broth, dog ice cream etc ... It's been so much cleaner and easier than putting it in a dish; the treat lasts longer and the dog is entertained longer. Whether frozen or not, this toy is very easy for my dog to get everything / lick clean. It's very easy to clean either putting in the top shelf of dishwasher or hand washing with a bottle brush. Treat of no treat, this is entertaining for my dog. He likes to simply run around with it in his mouth or randomly chew on it. This is different from his balls or bones because it's kind of flat and thin. Good buy and great to help cool him off from the warm weather.
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Reviewed in the United States on August 10, 2024
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Verified Purchase
Rosemarie
Alexandria, US
★★★★★ 4
Dogs love the treats hidden within
Style: Chilly Penguin, Size: Small (Pack of 1)
The treat holding penguin is ideal for feeding treats, frozen and otherwise, to your loving pets. I have put yogurt, applesauce, mashed bananas, and other treats inside the penguin. The puppies love licking the yummy treats out of the penguin. It occupies them for quite a while. The only thing is that they are not very easy to clean. I use a small soft brush after soaking them in hot water.
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Reviewed in the United States on December 7, 2025
K
Verified Purchase
knittingon
Carnegie, US
★★★★★ 5
wonderful - best dog toy on the market!!
Style: Chilly Penguin, Size: Small (Pack of 1), Style: Chilly Penguin, Size: Small (Pack of 1)
my 10.6 lb shih tzu mix loves these. yes, they are durable. this is the third dog on some of them. i fill with diluted baby food mixed with 3 drops honey, carrots in todays, or peanut butter and a tad of jelly mixed with water, or water with unsalted cooked veggies like broccoli or cauliflower stems and carrot bits, or baked and mixed with water sweet potato. she eats just anout any vegetable. the water is to reduce calories as i had to take 3 lbs off her when i got her. and yes, they stack nicely. when i let her out of her crate, she looks and grabs it and puts it on the kitchen floor for a refill. her idea, not my training but i like it. this is an addition to my previous review. as far as i'm concerned, this is the best toy on the market for very small dogs. my dog has been at target weight for 2 years now and i restrict her treat calories to a strict 21 kcals daily. she is also now a working dog. i have now done frozen greek yogurt with apples and blueberry baby food diluted, kibble mixed in water. wet dog food diluted with water etc. i leave her in her crate with one and two cameras on her, one two way audio and she has stopped all barking and dutifully brings the toy and actually deposits it in my hand when i let her out of the crate. every 2-3 days it's like a new toy flavor and no toys have and tooth marks or anything on them. they're used daily. understand this lil 10.6 lb dog goes thru nylon power chews regularly so she's super capable of destroying toys but i think the little bit of food satisfies her with the penguin and 2 1/2 years in, she has no desire to destroy them. i now own 8 of these as 2 stay in her travel bag. we would be heartbroken if the company quit making these penguins. fantastic product. the small would even have worked for my 5 lb papillons had they made them then.
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Reviewed in the United States on November 15, 2022
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Verified Purchase
Glutton for books
West Palm Beach, US
★★★★★ 5
Great durability and utility
Style: Chilly Penguin, Size: Medium/Large (Pack of 2)
I love the size of these and the sturdiness. I freeze bone broth and put it in the crate or give it to dogs when it gets warm out. To help them cool or help them with teething. They have decimated other holders of frozen liquid, but these have lasted well. They also do not get sharp edges when chewed on by English bulldogs.
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Reviewed in the United States on March 22, 2026

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