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BOSS DAC COMPONENTS
(click to enlarge)
BOSS HI-FI DAC BLOCK DIAGRAM
Software Info: Add "dtoverlay=allo-boss-pcm512x-audio" to config.txt
We all live in a society obsessed by brand names and the latest gadget. Sometimes with reason sometimes with none.
The RPI has one major problem with audio. The clocks coming from CPU can only output one frequency clock perfect (very close), resulting in major problems with audio files sampled at 44Khz (and multiple). Too much jitter on i2s clocks. So we invented the Kali but there is a second way.
Enter the master mode for i2s. Instead of the RPI giving the clock on the line, the DAC itself sends the clocks and RPI sends the data (file to be played). Since we used 2 clocks the problem above disappears. Ours is not the first master DAC on the market, there are others... read on.
Our BOSS DAC is unique, because of the way we have implemented the design. First we separate the power on 3 channels and filter it: one for the digital side, the second for analog and third for the clocks themselves. Then we take the filtered power and use a second filter (LDOs) to further quiet the noise. Note that we use some of the best LDOs on the market (LT3042 from Linear). In addition, we use Japanese oscillators from NDK for a very low jitter clock - almost as good as famous Crystek.
Finally, on the analog stage we are using a film capacitor (not ceramic) for a quiet DC to feed the TI IC (ceramic exhibit some piezo distortion, not what you want in analog stage). Not happy with this, we have added a supercapacitor for an extra kick when analog stage is asking (like deep bass).
What we have achieved, in our opinion, is the best analog implementation of the PCM5122 on the market, while at same time correcting the clock problem from RPI.
Yes we live in a society obsessed with the latest gadgets. The BOSS however, is a very solid implementation of the PCM IC that will give you the greatest bang for your buck. It will sound great no matter what you throw at it - this was our goal and promise to you.
我們都生活在一個痴迷於品牌和最新小工具的社會中。有時有理由有時沒有。
RPI有一個主要的音頻問題。來自CPU的時鐘只能輸出一個完美的（非常接近）的時鐘頻率，導致以44Khz（和多個）採樣的音頻文件的主要問題。i2s時鐘抖動太大。所以我們發明了卡利，但第二種方式。
輸入i2的主模式。DAC自身發送時鐘，RPI發送數據（要播放的文件），而不是RPI給出時鐘。由於我們使用2個時鐘，上面的問題消失了。我們不是市場上第一個主DAC，還有其他...閱讀。
我們的BOSS DAC是獨一無二的，因為我們實現了設計的方式。首先，我們分離3個通道的電源並對其進行濾波：一個用於數字端，另一個用於模擬，第三個用於時鐘本身。然後我們取得濾波後的功率，並使用第二個濾波器（LDO）進一步安靜噪聲。請注意，我們使用了一些市場上最好的LDO（來自Linear的LT3042）。此外，我們使用NDK的日本振盪器來實現非常低的抖動時鐘 - 幾乎和著名的Crystek一樣好。
最後，在模擬階段，我們使用薄膜電容器（而不是陶瓷）來安靜的DC饋電TI（陶瓷表現出一些壓電變形，而不是您想要的模擬級）。不滿意的是，當模擬舞台問題（如深鱸魚）時，我們增加了超級電容器的額外踢球。
在我們看來，我們所取得的成就是PCM5122在市場上的最佳模擬實現，同時也是RPI糾正時鐘問題。
是的，我們生活在一個痴迷最新小工具的社會。但是，BOSS是PCM IC的一個非常堅實的實現，它將為您帶來最大的轟動。無論你扔在哪裡，這聽起來都很棒 - 這是我們的目標，並向你承諾。
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Compatibility
- Compatibility: RPI only. Isolator board (at 192Khz). Relay attenuator.
- PSU: Power is taken from RPI and then heavily filtered for each rail. Also, possibility to feed external PSU 5V/100mA please check manual
- Not Working With: Sparky, Kali
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Features
- For RPi
- BOSS is a Master DAC (Master DACs are compatible only with RPI)
- Compatible with RPI2 and RPI3
- Compatible with OSMC / Max2Play / RuneAudio / Volumio / Moode / PiCorePlayer / PiMusicBox / OpenELEC and others + Roon Ready
- Dedicated 384 kHz/32bit high-quality DAC PCM5122 for best sound quality
- Audio output connectors: 2 x RCA (Left & Right ) & Allo Volt Amp header
- HAT size
- DAC SNR is 112dB
- DAC THD+N @ -1dBFS are –87dB
- Full Scale Output of DAC is 2.1Vrms
- Dynamic Range of DAC is 112dB
- Sampling Frequency ranges from 8 kHz to 384 kHz
- Ultra-low-noise voltage regulators & LPF for optimal audio performance
- Noise level: 66.27uVrms
- Integrated EEPROM for automatic configuration (with write-protection)
- Automatically switching frequencies according to the input I2S signals
- Dual low jitter NDK crystal oscillators for Master Clock generation
- With 45.1584/49.1520 MHz Ultra Low Phase Noise Oscillators
Support & Downloads
