最低噪音运放

i886

请教大家：推荐最主要最低, 超低噪音双运放, 前置输入用[s:20]:loveliness:

[ 本帖最后由 i886 于 2011-8-20 23:59 编辑 ]

海飞诗

交易区新帖推荐

5532[s:15]

民族败类

2132

民族败类

比4558好。

i886

[s:21][s:21] LM4562如何?  
. . . 只关注无噪声的 Ultra Low Noise, 我要黑色的背景!

[ 本帖最后由 i886 于 2011-8-21 00:37 编辑 ]

MIROAUDIO

交易区新帖推荐

噪声低的电流小，电流小则动态差，声音冷硬。

老浦东

“不用运放”

的无源前级。[s:97] [s:97] [s:97]

长春

原帖由 i886 于 2011-8-21 00:10 发表
[s:21][s:21] LM4562如何?  
. . . 只关注无噪声的 Ultra Low Noise, 我要黑色的背景!

晚上关灯听

i886

我预置了两个运放，一个用于输入一个用于输出。我需要最低噪声前的输入，这是重要的我认为。[s:97]

kopfhorer

5532并联

西江月

AD797，超低失真、超低噪声，常现于天价极品前级，音色性能都无可挑剔，就是贵点，荷包鼓的可考虑。

i886

原帖由 kopfhorer 于 2011-8-21 12:41 发表
5532并联

两个5532堆叠在上面??? [s:31]

i886

原帖由 西江月 于 2011-8-21 12:46 发表
AD797，超低失真、超低噪声，常现于天价极品前级，音色性能都无可挑剔，就是贵点，荷包鼓的可考虑。

[s:21]
计划安装昂贵 AD, LME 在后面的输出。

i886

原帖由 i886 于 2011-8-21 12:48 发表

两个5532堆叠在上面??? [s:31]

Great Idea! :victory:[s:97]:victory:

i886

[s:20] http://www.beavisaudio.com/projects/ScreamerLab/

Stacking the opamps means that the opamps are physically soldered to each other, pin for pin, so you form a physical “stack” of opamps. In the circuit, the opamps are running in parallel. This has been considered before within the DIY community and offers a different take on opamp modification.

Jack Orman (www.muzique.com),  another highly respected and knowledgeable source about such matter, has the following to say about stacking:
                                        …what you get is increased current  drive. Typically, a small value resistor, 10-50 ohms is inserted in the output of each opamp before they are combined to the signal output. This ensures that the opamps share the drive more equally. Using a pair of opamps in parallel will actually decrease the noise by about 3db due  to random cancellations. Four opamps in parallel would reduce it even further, but that’s about the practical limit.”

[ 本帖最后由 i886 于 2011-8-21 13:26 编辑 ]