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Kronos AV
Kronos AV
Silent Angel
Thunder Data Co., Ltd. was founded by Dr. Eric Jian Huang, CEO. Who was former CTO in EMC China, and the team members specialize in server, network communication, data management, network storage software, hardware architect engineering, and product marketing.CTO, Chorus Chuang is a specialist in network hardware, storage software, digital communication signal, and audio grade NAS.Our goal is to improve signals quality of computing, networking, and storage. We developed 2 series of product lines: Silent Angel and Thunder Data currently. Silent Angel product line aims at providing solutions for high-end audio consumer products. The goods upgrade the level of Hi-Fi music enjoyment by improving the signal quality and server performance.

Silent Angel F1 Linear Power Supply
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  • Regular price £429.00
  • Available Worldwide Shipping

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A Path to The Clear and Fresh Audio Forest

Forester F1, a reliable linear power supply tailored for N8 and Raspberry Pi 4 Model B.

The aim of F1 is to bring the most real, pure and intact voice to audience.

Zero noise, zero data corruption and zero power break-off, to feel the touch of winds, step into sunshine and hear the slight friction sound of leaves. Not matter wave’s lapping or rabbits’ whispers, all sounds can be distinguished.

To fulfill all Hi-Fi requirements on stable power source and multiple output connector type, Silent Angel perfectly adds multiple technologies, as high-efficiency toroidal transformer, advanced fully symmetric circuit design, low noise MOSFET in parallel and EMI filter.

With stable electricity input to ensure the consistency and integrity of the music enjoyment.

The LAN port on the Hi-Fi brings new challenge to power supply.

To playback digital music or high resolution music, network player needs to handle about 200MB - 1GB data for DSD format music in 5 minutes.

The working frequency is at least 1,000 times that a normal linear power can handle.

F1 is the solution to high frequency nature of network for 5V powered network devices (such as: Bonn N8), network audio player, Raspberry Pi board, etc.

Optimal Material

The shell of F1 consists of high-quality-thick material to reduce vibration of transformer.

The panel adopts CNC progressing to ensure congruence.

Toroidal-symmetric Transformer

The improvement of efficiency is obvious. 

The core permeability of toroidal design is higher than the laminated one, which conduces to the electrical efficiency of transformer trend better consequently.

In addition, the energy-saving superiority of toroidal design is that the no-load current is merely 10% comparing with the laminated one.

Advanced Full Symmetric Circuit

A distinct advantage of F1.

This design can eliminate noise inside mostly, the symmetric circuit is able to consolidate the accuracy of power output and ensure a stable power supply.

Low Noise MOSFET Parallelled

MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a vital component for F1 to control voltage output.

As MOSFET controls output by adjusting the gate voltage, its gate drive circuit is less complex than BJT’s base drive circuit.

As a result of less complex design, the switching frequency of MOSFET is higher than BJT’s, which supports a more precise and stable voltage output.

Effective Protection Mechanism

Adopting an output voltage detection circuit, an output current protection circuit.

Two temperature protection circuits to cut off the output. Preventing from damaging the device when unexpected failures.

As tailored for N8 and Raspberry Pie 4 Model B.

F1 covers two pairs of connectors, which consists of one USB and one DC plugs, and there are two 60cm x 5.5mm x 2.1mm DC plug to 5.5mm x 2.1mm DC plug  in packing box to help users to connect F1 to other appliances. 

Dimensions: 155mm (W) x 115mm (D) x 58mm (H)
Device Weight: 1.3KG
Input: 230VAC or 115VAC 50/60Hz (with voltage selector)
Output: Dual 5V@2A
Output Connectors: DC PLUG *2, USB Type-A Female Connectos *2
LED indicators: Status LED *2, Over-Temperature-Protection LED *2

1.2m IEC Type AC Power Cord *1
60cm DC Plug (5.5mmx2.1mm) to DC Plug (5.5mmx2.1mm) Cable *2
Quick Start Guide *1
Warranty Card *1

We are still delivering orders as normal. When your order ships you will still receive tracking details. For UK shipments, Our couriers have procedures in place to ensure deliveries are arriving as quickly & safely as possible. Drivers can now sign for your parcels, however will notify you that they have arrived, in order to ensure you receive your parcel. Signing for the parcel has now been stopped temporally for hygiene reasons. Drivers are also working with customer instructions, so you can ask them to leave the parcel in a safe place (doorstep etc...) if you prefer not to come into direct contact with the driver.

There has been no changes to deliveries with Brexit. All deliveries to the UK mainland, Northern Ireland and the Republic of Ireland are operating as normal. No VAT or charges are applicable. 

We have several deomonstation areas in both of our branches. Please give us a call on 03435236169 or email support@kronosav.com to enquire about hearing products at your local branch. 

Please always contact us before to make sure the product(s) are available

Express Deliveries

Express Delivery is FREE on all orders over £50. Express Delivery offers delivery in 24-72 hours from time of purchase. We use premium couriers for this service, mainly DPD & Royal Mail. DPD will offer you a one hour window for delivery to make sure someone is at home, or you can reschedule the delivery if no one is around. 

Standard Deliveries

Here at Kronos AV, we have vast experience with e-commerce sales. Making sure that your parcel arrives undamaged is a huge priority for us. That’s why at Kronos AV, we only use premium couriers for all our orders. All our parcels are shipped with DPD or Royal Mail and are always sent Signed For to make sure it gets to the right person. 

If for any reason your parcel does arrived damaged, please get in touch, and we will be happy to get everything resolved for you. We are always on hand to help!


Delivery is FREE on all orders over £50. In order to offer FREE delivery to UK customers, we use several premium couriers to ensure your delivery arrives safe.

Most large orders (over 2kg) ship using DPD or DHL courier and smaller orders (under 2kg) by Royal Mail signed for services.

The most appropriate courier will be chosen for the items ordered to ensure the quickest possible delivery.

We can offer very generous trade in offers across the majority of our product range. 

Why not ask and see how much you HiFi is worth!

To find out how much your HiFi is worth... Click Here

If you have any question, please feel free to call us on 03435236169 or email support@kronosav.com