給我一台線性電源

italjet

這個可以嗎？

http://h5.m.taobao.com/awp/core
/detail.htm?id=554396290449&toSite=main

CKL

italjet 發表於 2017-9-13 00:38
這個可以嗎？

http://h5.m.taobao.com/awp/core

Using LT1083, noise is 5mV. Added value to the good output cable.

AS881

我就下單了這個,唔知好唔好了!
https://m.intl.taobao.com/detail ... amp;id=525938406493

clplarry

AS881 發表於 2017-9-13 07:09
我就下單了這個,唔知好唔好了!
https://m.intl.taobao.com/detail/detail.html?spm=a1z5f.7632060.0.0&id=5 ...

I think Zero Zone is a better one among most brands in China made LPS.

張東尼@FB

要 micro usb 是否用之下就得?

CKL

AS881 發表於 2017-9-13 07:09
我就下單了這個,唔知好唔好了!
https://m.intl.taobao.com/detail ... 632060.0.0&id=5 ...

Don't know about the regulator and noise. The output connector is good. I doubt if a linear power supply should include a digital voltage display? Would the digital noise of the digital circuit ruin the analogue output?   

SAnalogue

CKL 發表於 2017-9-13 10:42
Don't know about the regulator and noise. The output connector is good. I doubt if a linear power  ...

呢種可調LPS 係針對一般用家...沒有他表...睇住個DISPLAY 來調TRIMMER 教電壓..
但呢D DISPLAY 一定會對音質有損害, 而且用得TRIMMER 都唔會諗住高質得去邊.....

要高質...一定要FIX VOLTAGE OUTPUT...因為隻牛要為所需的輸出電壓特別訂製... 有所偏差都唔能夠在最合適的工作點工作
題外話....藍色LED 係最NOISY....用LED要揀既話 就揀綠色或紅色...相對少D NOISE...但當然最好係冇LED

yuekmo

SAnalogue 發表於 2017-9-13 10:57
呢種可調LPS 係針對一般用家...沒有他表...睇住個DISPLAY 來調TRIMMER 教電壓..
但呢D DISPLAY 一定會對 ...

"題外話....藍色LED 係最NOISY....用LED要揀既話 就揀綠色或紅色...相對少D NOISE...但當然最好係冇LED"
This is a fact.
Disconnect the voltage display circuit shall lessen noise and reflect on the sonic performance as reviving more detail and lessening harsh at treble zone. The effect is no subtle on those low voltage regulator who are working on the critical path of small signal.

diwily

我自己DIY的毎個LPS, 除電源開關外, LED電壓顯示都加裝開關, 除了開機時及有需要檢查電壓外, 其餘時間都關掉LED電壓顯示。

diwily

請問"張東尼@FB"師兄, DC[2.1mm or 2.5mm]轉Micro USB 插何處有售?
唔該。

張東尼@FB

diwily 發表於 2017-9-13 14:44
請問"張東尼@FB"師兄, DC[2.1mm or 2.5mm]轉Micro USB 插何處有售?
唔該。

我冇買過 因為我都未買個lps 但我見到淘寶有

CKL

Received on yesterday, look at its transformer, output transistor and error amplifier:

張東尼@FB

CKL 發表於 2017-9-14 08:47
Received on yesterday, look at its transformer, output transistor and error amplifier:

So good or bad?  And what do u use it for?

DigitalMana

不要太擔心大電流LPS輸出不夠好（大部分大電流LPS輸出都很一般），我幾個friend都有用大功率的LPS電源，他們大部分都加左個DC iPurifier, 照他們講，效果立竿見影，插左上去肯定拔唔返羅來，你可以試試, 不過尼d耶真系好毒咖

CKL

SamPoon@FB 發表於 2017-9-12 12:31
主要因為npn管同線路
確實答案你問偉良,偉良會答你

Yes, you are right. At 1A and 1.5A, it works fine. At 2A, it collapses as shown:


The component to blame is the transformer. Output 12.5VA / 7.5V = 1.67A.

CKL

張東尼@FB 發表於 2017-9-14 09:04
So good or bad?  And what do u use it for?

It is good if your application current is <1.6A. The measured noise is 1.6mV. I use it for Raspberry Pi 3.

張東尼@FB

CKL 發表於 2017-9-14 10:23
Yes, you are right.  At 1A and 1.5A, it works fine. At 2A, it collapses as shown:

Not even fit for purpose on a RPI

CKL

張東尼@FB 發表於 2017-9-14 10:36
Not even fit for purpose on a RPI

https://www.pidramble.com/wiki/benchmarks/power-consumption

A full loaded Pi 3 consumes only 730mA. I add a Allo Kali reclocker that consumes extra 100mA. So 1.6A is plenty of power.

張東尼@FB

CKL 發表於 2017-9-14 10:44
https://www.pidramble.com/wiki/benchmarks/power-consumption

A full loaded Pi 3 consumes only 730m ...

I played retropie on RPI3 on both Aukey USB charger and Apple 12W charger and getting voltage warning.
Both are rated at 2.4A.

The LPS probably enough for music streamer w/o headphone amp though.
Do report back if you hear any SQ improvement.

DigitalMana

建議可以試試iPower，看測試報告9V版本系2A Loading一d事都沒有，那5V版本iPower 系2A肯定沒問題。

再想更乾淨就加一個DC iPurifier, 又可以再次升多一級。

Headphone amp powered by the RPI3 ?