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[分享] DIY 線電 Synology NAS 918+

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發表於 2019-6-22 19:55:43 | 顯示全部樓層 |閱讀模式
本帖最後由 gapson 於 2019-10-25 22:56 編輯

一直都想自己做個線電比部 NAS

又唔想用淘寶pcb及kit

所以今次搵到韓國pcb,美國300w火牛,自定制cnc機箱完成

1. Super Fast Recovery Diodes(Soft Recovery type) :  21ns trr
2. Long life, Low Impedance Type Smoothing Capacitor
3. Thin Film  0.1%/10PPM Low Noise Resistor
4. Low ESR SMD Tantal Capacitor
5. Ultra Low Noise & High Precision Voltage Reference
- LT1236ACS8-5(>5V) : 2ppm/°C, 0.05% Accuracy
- MAX6225A(<5V) : 1ppm/°C, 0.02% Accuracy
6. OPA132 Buffer
7. LT1028 Driver and Error Amp
8. Gold Plated PCB

<Specification>
1. Noise : Min. 0.9nV/√Hz @1KHz ~ Max. 5.04nV/√Hz @1KHz
2. PSRR(Power Supply Ripple Rejection) : 132dB(Vs=8V to 30V)
3. Voltage Temperature Coefficient : 1~2ppm/°C
4. Short-Circuit Protected
5. One Positive Output
6. Current Limit : 10.0A
7. Output Voltage : Fixed 12V

64757105_10157458517504074_5462239957085061120_o.jpg 64838574_10157458517604074_2713783766106505216_o.jpg 64711436_10157458517309074_5556168362112843776_n.jpg 64903900_10157458516834074_7818441041232527360_o.jpg 65364130_10157472278769074_527568511053070336_n.jpg 65317025_10157458517169074_5941233728050167808_n.jpg
65102038_10157458516884074_7669707406103805952_n.jpg

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發表於 2019-6-24 19:00:21 | 顯示全部樓層
Thanks for sharing.
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發表於 2019-6-24 19:36:06 | 顯示全部樓層
請你問塊板是自己設計,還是不成品買來的,在那處署的。
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 樓主| 發表於 2019-6-24 22:52:20 | 顯示全部樓層
本帖最後由 gapson 於 2019-6-24 22:57 編輯
hksarac 發表於 2019-6-24 19:36
請你問塊板是自己設計,還是不成品買來的,在那處署的。


Ching,

The board was ready made in ebay:

Search "ULN-PS7 Ultra Low Noise, 6.0A High Current Power Supply for High Quality Audio"

其實我自己都有買香港其中一間(淘寶代工)出品的線性電

自己比較過,評價就唔講太多

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發表於 2019-7-18 09:11:46 | 顯示全部樓層
好重料喎
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 樓主| 發表於 2019-7-18 20:09:58 | 顯示全部樓層

玩一次就收手

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發表於 2019-8-1 17:11:50 | 顯示全部樓層
本帖最後由 seafoodlover 於 2019-8-1 17:13 編輯

請問條DC線的屏蔽是接LPS定係接NAS?

隻牛在那裡定?
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 樓主| 發表於 2019-8-1 18:53:40 | 顯示全部樓層
seafoodlover 發表於 2019-8-1 17:11
請問條DC線的屏蔽是接LPS定係接NAS?

隻牛在那裡定?

LPS

牛係美國制造同訂
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發表於 2019-8-3 15:56:20 | 顯示全部樓層
請問用甚麼做水塘?線電無大水塘一定出事!
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 樓主| 發表於 2019-8-4 12:44:31 | 顯示全部樓層
banny_seng 發表於 2019-8-3 15:56
請問用甚麼做水塘?線電無大水塘一定出事!

有4700uf x4
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發表於 2019-8-4 13:31:30 | 顯示全部樓層
會唔會細左D,最大出10A喎!
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 樓主| 發表於 2019-8-4 17:26:27 | 顯示全部樓層
banny_seng 發表於 2019-8-4 13:31
會唔會細左D,最大出10A喎!

師兄,用ripple計完只需 6000uf

佢唔係Class A 唔洗咁大
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發表於 2019-8-4 19:08:55 | 顯示全部樓層
好簡單,full loading用示波器一看就知,LPS就等於Class A的耗電量,因為得一組全時工作,輸出1A輸入就>1A,同理,輸出10A輸入就長期>10A。
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 樓主| 發表於 2019-8-4 21:08:47 | 顯示全部樓層
banny_seng 發表於 2019-8-4 19:08
好簡單,full loading用示波器一看就知,LPS就等於Class A的耗電量,因為得一組全時工作,輸出1A輸入就>1A ...

多謝師兄關注

1:安裝後已上示波器及負戴儀,在10A情況下波形一切正常;
2:賣家預設計下可承受12A也一切正常
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發表於 2019-8-4 22:51:15 | 顯示全部樓層
請恕我多事,Ripple應如示波器1的波形,你度輸出位當然平直很多,但穩壓前的平直也很重要的。
power_supply.jpg
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發表於 2019-10-21 11:47:09 | 顯示全部樓層
勁!專業 ^_^
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發表於 2019-10-25 14:20:11 | 顯示全部樓層
為什麼不是上淘寶,要求賣家,按照指定的元件來製作就好?
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 樓主| 發表於 2019-10-29 17:47:11 | 顯示全部樓層
HungLiu@FB 發表於 2019-10-25 14:20
為什麼不是上淘寶,要求賣家,按照指定的元件來製作就好?

我以前做開唔少淘寶Kit

就算全啱spec
個人睇法 聲音係會差啲
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發表於 2019-10-30 08:52:22 | 顯示全部樓層
gapson 發表於 2019-10-29 17:47
我以前做開唔少淘寶Kit

就算全啱spec

NAS不是影響聲音的重點,只要後端有reclock就能幾乎改善聲音品質,讓你在NAS所投入的時間與金錢瞬間等於白費功夫

如果你真的搞懂reclock如何大幅降低Jitter,就知道我的意思

底下是我貼在國外論壇的論點:

Let me explain why the sound quality of raspberry pi or the computer is very poor, and USB has undergone a conversion to generate more jitter so that USB is more worse. For the digital part, if you want to improve the sound quality, you only have to reduce jitter.

Although the computer CPU will be intermittent in the delivery of packets, and let the packet too slow delivery, but the order of the packet is not chaos. Of course, it may be because the computer clock is not accurate, resulting in too slow or too fast delivery packet. But if the packet is too slow to be passed immediately to the DAC, the sound will be strange, so the packet may be too slow or too fast must be resolved first.

The working principle of the USB chip is basically not much different from CPU. Therefore, as long as the music signal passes through the USB chip, jitter will be greatly increased, which seriously deteriorates the sound quality. The USB isolator or filter actually only makes the USB chip work more stable, reduce jitter, but The USB isolator or filter still can not completely solve the jitter generated by the normal operation of the USB chip, which is caused by the USB, CPU innate design.

The order of the packets will not be destroyed so we have a chances to solve jitter from computer if the reclock board has enough buffer to make the data can be stored more , for example 44khz music signal will transmit delay at least 1 second, and it be solved too slow or too fast delivery packet. That's why when using Ian' FIFO, when you press to play music, you will always hear the sound after one second. It's to solve the tolerances between clocks. It uses the better MCK to continue to pass the data orderly read from the buffer.

Relatively, if the buffer is not big enough, no way to solve too slow or too fast delivery packet , for example less than 1 second delay, and it is difficult using the better MCK to pass the information more correctly.

FIFO itself maybe not necessary, but the main useful because his buffer is big enough and send the packet back to the DAC using a better quality clock chip. The whole process is called reclock.

Based on our understanding of jitter, it is easier to understand why CD is still the best music storage medium, not a hard drive.

A WAV file is made of, for example, 100 data units. When the WAV file is stored on CD, the 100 data units are stored continuously so that the time difference between each data unit is relatively small when the read head reads the data from CD, and there is almost no jiiter.

The same WAV file is stored in the hard driver, the 100 data units may be scattered on the driver, even if the hard drive has been defrag, so that the head read WAV file from the hard driver, the time difference between each data unit is relatively bigger and bigger jitter.

Tape and CD are the same to store continuously the data units, but CD has many holes on the surface of the CD to make the reflected light easily deflected, resulting in jitter.  Also, the tape is fixed speed, unlike the CD is not fixed speed.  Tape is the best storage media for a music file.

Flash memory is the worst one, because it uses of the same the hard driver with the decentralized storage means and when read WAVE file from flash memory, there will be a large number of transistors are turned on/off, and each switch speed is not the same, this is very easy to produce jitter.  Flash memory will have a bunch of high-frequency noise.
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 樓主| 發表於 2019-11-7 21:05:33 | 顯示全部樓層
VincentFong@FB 發表於 2019-11-7 16:26
BTW 用一個300W 火牛做一個120W LPS俾一個30W NAS好似太誇張

The NAS required 12v 8.3a...
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