DTT V2.0

 [福音---DTT V2.0]

因緣際會之下,我認識了一位施兄,今天收到了他寄給我的樣品。剛好他也開發了電晶體的曲線追蹤儀,價格跟LockyZ一樣,但是施兄比較有耐心也比較嚴謹,所以他的這台作品DTT在線路設計上比較合理、軟體較新、分析功能也更為強大。舉例來說,LockyZ採用單電源供電,但因為量程為38~40V,因此硬是讓裡面耐壓上限36V的OP接受了38~40V的電壓,就是賭一下OP不會壞,LKZ的工程哲學大致類似如此。
DTT採取比較嚴謹合理的設計,雙電源正負供電,並且搭配Python寫的軟體(比第一版進步相當多了),加上擴展模組的話可以一次同時自動量測多個晶體,節省配對時間。所以第二代DTT進步相當多,也讓我相當期待。施兄也採取了我一部份的建議,把語言檔獨立出來,讓使用者可以自行切換或翻譯軟體介面語言;如圖四,則是我初步翻譯出來的英文版。
還沒有時間可以測試DTT二代,先PO一些實機照片還有軟體UI。軟體最大的亮點是可以直接根據掃描結果模擬工作點,藉此得到FFT、失真THD、靜態電流、轉移特性等等,這些真的很實用,綜觀目前市場上的業餘等級儀器,好像是首創。

1. Vc, Vd : +/-0.1V ~ +/- 36V 2. Ic, Id: 0.01mA ~ 2.5A 3. Vb, Vg : +/- 0.05V ~ +/-10V 4. Ib : 0.1uA ~ 50mA


簡論LM3886製作:入門篇

 

探討LM3886電路-------適合初學者




C1C2為電源濾波電容,取值0.01uF--1uF之間,不同大小及品牌對聲音有點影響,一般使用0.1uF即可。

C7R1組成靜音(Mute)電路,容量和電阻的值決定了靜音時間長短,電容可取10uF--100uF,電阻可取10K~100K,值越大則靜音時間越長,如無特殊需求取圖中參數即可,此處元件對音質沒有影響,但須注意耐壓要大於50V

C8
R6組成所謂的”Zobel network”,配合輸出電感達成穩定電路的作用,C8一般取值0.01uF--0.22uF之間,R6一般取1~22歐姆之間,由電容的取值大小以及電阻的選用功率大小可看出電路的穩定情況,一般用得越大則說明電路存在穩定性問題的可能越大。本處選用1041/4W 10歐姆;實測過不裝也沒問題,但裝上還是保險一點,畢竟不怕一萬,只怕萬一。

RL

ESS Hump: Root Cause?

下面的方案僅僅針對SGD1LA-QXD1來自SONCOZDAC,其他的機型僅僅只有參考的意義。

 為了節約大家的時間,先說方法和結論:

調整ES9038Q2M DACIV轉換電路阻容配置以及LPF電路的阻容配置即可完全修復駝峰問題,屬於硬體修復方案!

To sum up, the "ESS Hump" of ES9038Q2M can be fixed by changing the setting of capacitors and resistors of LPF as well as I/V converter. The fixation is purely done by hardware adjustment. 

Some more Sensor cord Drive: Sigma Drive

 

Sigma Drive by Kenwood








The Kenwood has also developed " Sigma Drive " which requires 4 wires for 1 channel.

老擴神器

[老擴神器]


老擴大機通常有幾個問題,常常是相容性的問題。







第一就是端子不是現代的香蕉插或是Y插,就是很簡單的銅線夾了一下就好,理論上這應該也是最直接的傳輸,但現代發展出了各種各樣的端子,有什麼鍍金、鍍佬、防磁OFC等等,看到這些總想說以前的人怎麼沒這些煩惱(消費),是蠻懷疑這些端子是商業因素的產品XD

畢竟這些周邊配件零零總總加起來也是很驚人的花費呢。

Curve Tracer UPDATE

Intelligent CurveTracer Software Release

#軟體更新
#Software Update
You can now download it at Github.

The Latest version of Locky_Z's Curve tracer, ICT V1.1(ads7871_v3s.exe).


As a 3rd-party updating software, user Interface has been translated and optimized into English for better understanding.
Moreover, in ICT V1.1, the background color of curve area has been changed into white, green, blue, etc., white has finally chosen as background.


The readability of multiple curves has improved massively, more importantly, the Locky_Z's stamp on the lower right corner has been removed, and this makes image copied in the clipboard more cleaner.



Toshiba CLEAN DRIVE


Aurex (TOSHIBA) has developed some analogue technology in 80's. For power amplifier, they use "Clean Drive" for their product in higher end level, such like Aurex SC-A90F.

Some technical briefing of Clean Drive: 



A third wire needed---Clean Drive

The role of an audio amplifier is to faithfully amplify the incoming signal and feed the amplified signal into the loudspeakers.

 

Improved vacuum tube models for SPICE simulations

  Improved vacuum tube models for SPICE simulations from: https://www.i-t.com/blog/updating-norman-korens-tube-amplifier-design/improved-vac...