![]() ![]() Simply put: a better crystal means a better sound! Most SBCs use a very cheap crystal with lots of jitter in order to save costs.įurthermore, there are 2 kinds of frequencies for digital files: 44.1Khz (wave files) and 48khz (streamed music). The accuracy of this crystal is very important in how well the DAC will transform the digital signal into analog sounds. Click to Enlargeīut what’s a Reclocker for anyway? That’s explained in Kali brochure:Įvery SBC has a crystal that it used to send digital signals to your DACs. The JTAG header is soldered and easily accessible so if might be possible to reprogram the PLD. It includes a Lattice MachXo3 LCMXO3L-4300C PLD / FPGA with 4300 LUTs, 34 kbits distributed RAM, 240 kbits ESR SRAM, and two PLLs, as well as ISSI IS61WV25616EDBLL-10TLI 256K x 16 static ram with ECC. Allo Kali Reclocker BoardĪllo Kali handle power with the power jack to use with the 5V/3A power supply. ![]() You’ll find more technical details in Volt Brochure. The bottom has two header to connect to one of Piano Audio DAC boards. VOLT is an amplifier board based on TI TPA3118D2 30-watt Class-D audio amplifier chip, and includes two terminals for the kind of speakers you’d use in home theater systems. It features two TI PCM5142 stereo audio DAC’s. Piano 2.1, as its names implies, has been designed for 2.1 system with 4 RCA jack, two for Left and Right speakers, and two for one or two subwoofers. Piano 1 comes with two RCA connectors and a headphone jack, and features Texas Instruments PCM5122 stereo audio DAC. There’s also an unpopulated UEXT connector used to access the serial console. My sample does not include a NAND flash, but you’ll notice the Hardkernel ODROID like eMMC module connector on the top left, and the micro SD card slot on the right. The processor and memory chips are covered by a large heatsink, and we’ll find the usual 40-pin Raspberry Pi connector on the top of the board, while the bottom has a 50-pin Telecom connector for some other add-on board(s). The brain of the system is Sparky SBC with Actions Semi quad core Cortex A9 processor with 1 or 2GB RAM, SD card, NAND flash and eMMC module storage options, HDMI and LCD display outputs, a camera connector, two USB 2.0 host ports, one USB 3.0 port, a Fast Ethernet RJ45 port, as well as a micro USB port for power, some buttons & LEDs, and an IR receiver. Click to EnlargeĮverything was neatly packed in their own individual little packages, and an assembly guide was also provided. I could find 6 different boards in the kit, which I detailed below, as well as a 5V/3A power supply with AU and EU adapter, a micro USB adapter, a micro SD card apparently pre-loaded with Ubuntu 12.04, a Quick Start Guide, and two Acrylic plates together with a screws and spacers set. The company has shipped me their complete audio development kit, and I’ll first check out the hardware, before taking time to experiment with the kit in a few weeks or months… Click to Enlarge While most of development boards are manufactured in China, Allo company is based in India, and all boards are manufactured there, which could be a benefit to Indian readers who want to avoid potential custom issues with other boards. Last year I wrote about Allo Sparky SBC Linux and Android development powered by Actions Semi S500 quad core Cortex A9 processor, which mostly differentiates itself from the competition by the many add-on boards for audio, VoIP, and IoT (WiFi+Bluetooth+Zigbee ). ![]()
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