Power Supply

Refer to circuit diagram L896 Sheet 10

The power supply sheet contains the connectors from the power supply.

SK1003 display supply. SK1000 Analogue supply. SK1001 Digital Supplies. SK1002 Power supply control.

Each of the supplies that is used passes through a LC filter to reduce any noise in both directions i.e. noise coming in from the switched mode supply or noise getting out from the noise on the digital board.

PSU Sync signal

The sync signal is derived from the I2S bit clock (64xFS) signal, which is divided down by IC1001 and the appropriate output to sent ( either 96KHz or 88.1 KHz ) to the PSU by the multiplexer IC1002.

Voltage set and VFD HT shut down

Two resistors set the voltage the Switch mode supply generates for the display R1008 sets the HT voltage to 36V and R1007 set the Heater voltage to 5V.

To prevent anode stripping when the heater is switched off the VFD display has a HT shut down this is performed by Q1000 which shorts the voltage set resistor R1008 to ground.

Regulators

Three regulators are used to provide secondary regulation for the +/- 15V signal (it is already regulated to +/- 18V on the PSU PCB) and the 5V analogue supply that is derived from the 18V regulated supply.

The 2.5V supply for the DSP chips is derived from the 3.3V supply by using the forward voltage drop of a diode. And a negative 5V rail is generated using a zenner to provide the bias voltage for the CMOS switches used in the bass management.

Re-clocking

Refer to circuit diagram L896 Sheet 11

The re-clocking of all of the I2S signals to the DACs is performed by IC1102 which clocks them all through the d-type flip flops synchronous to the master clock on pin 9. The Data signals then go straight to the DACs via series termination resistors. The Bit clock and word clocks are buffered by IC1100 to provide fan out to the four DACs each with their own series terminator to reduce reflections.

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Arcam AV8 service manual Power Supply Refer to circuit diagram L896 Sheet, Re-clocking Refer to circuit diagram L896 Sheet
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AV8 specifications

The Arcam AV8 is a high-performance audio-video receiver that has garnered attention for its exceptional sound quality and versatile features, making it a sought-after option for both audiophiles and home theater enthusiasts. Designed to provide an immersive viewing experience, the AV8 is equipped with a range of technologies that enhance its performance.

One of the standout features of the Arcam AV8 is its support for high-definition audio formats. The receiver can decode various lossless audio formats, including Dolby TrueHD and DTS-HD Master Audio, allowing users to experience studio-quality sound. This capability is complemented by its advanced digital signal processing, which ensures that the audio output is clear and dynamic, enhancing the overall entertainment experience.

The AV8 is built with an emphasis on connectivity and flexibility. It boasts multiple HDMI inputs and outputs, facilitating seamless connections to a variety of devices such as Blu-ray players, gaming consoles, and streaming devices. With support for 4K video pass-through, the AV8 is future-proofed for high-definition content, ensuring compatibility with the latest video technologies.

Another notable aspect of the Arcam AV8 is its user-friendly interface. The receiver is equipped with an intuitive on-screen display that simplifies navigation and setup. Additionally, Arcam has incorporated room calibration technology, which analyzes the acoustic properties of the listening environment and adjusts the audio output accordingly. This feature allows for optimal sound reproduction, tailored to the specific characteristics of the room.

The build quality of the AV8 is exceptional; it features a robust chassis designed to minimize vibration and interference, ensuring high-fidelity sound reproduction. The receiver is designed for ease of use, with remote control functionality and smart home integration options, making it convenient to operate alongside other devices.

In summary, the Arcam AV8 is a powerful AV receiver that combines high-definition audio capabilities, extensive connectivity options, and user-friendly features. With its strong emphasis on sound quality and innovative technologies, it stands out in the competitive landscape of home theater equipment, catering to the discerning tastes of audio enthusiasts and casual users alike. Whether for music or movie playback, the AV8 offers a compelling solution for those seeking an elevated audio-visual experience.
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