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There are many DACs for RPI Zero. Most of them low-priced, carbon copy of datasheet, slave DACs.
We decided to do something different:
Costing more (about the price of a large pizza, extra), we implemented the first Master DAC based on PCM5122 with many improvements over the standard circuit.
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 the first Master DAC for RPI Zero on the market.
Our Mini BOSS DAC is also unique, because of the way we have implemented the power 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. In addition, we use Japanese oscillators from NDK for a very low jitter clock - almost as good as the famous Crystek.
Finally, on the analog stage we are using a film capacitor and some ceramics for a quiet DC to feed the TI IC. Not happy with this, we have added a supercapacitor for an extra kick when analog stage is asking (like deep bass). Please understand … this is not an artificial bass booster … this is the bass as it was recorded. The only difference, enough electrons are present on our DAC (bass needs power) to be finally heard.
What we have achieved, in our opinion, is the best DAC for a RPI Zero.
MiniBoss也可以和RPi 2＆3一起使用
RPI Zero有許多DAC。大多數都是低價格，數據表的副本，從DAC。
我們決定做一些不同的事情：
成本更高（關於大型比薩餅的額外費用），我們實施了基於PCM5122的第一個Master DAC，並且在標準電路上進行了許多改進。
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，但還有第二種方式。
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。
我們是市場上首款適用於RPI Zero的Master DAC。
我們的Mini BOSS DAC也是獨一無二的，因為我們實現了電源設計。首先，我們分開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。此外，我們使用NDK的日本振盪器作為非常低的抖動時鐘 - 幾乎和著名的Crystek一樣好。
最後，在模擬電路上，我們使用一個薄膜電容器和一些陶瓷用於安靜的DC饋電TI IC。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。請理解...這不是人造低音助力器...這是低音，因為它被記錄。唯一的區別是，我們的DAC（低音需求電源）上有足夠的電子被終止聽到。
在我們看來，我們取得的成就是RPI Zero的最佳DAC。
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Compatibility
- Compatibility: RPI Zero/W , Volt+
- PSU: Power is taken from RPI and then heavily filtered for each rail. No independent PSU available.
- Not Working With: Sparky, Kali, Volt, Isolator
兼容性：RPI Zero / W，Volt +
- PSU：從RPI獲取電力，然後對每個軌道進行大量過濾。沒有獨立的PSU可用。
- 不使用：Sparky，Kali，Volt，Isolator
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* Please note that all acrylic cases we ship, have a protective film (which looks like brown paper). You will need to peel this film off, in order to reveal the case. This is to prevent scratching and fingerprints during shipping.
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