
原帖由 ljm_ljm 于 2008-3-4 15:11 发表
看这个THD N 图。
JRC 4580 适合输出2V 左右失真最小呢。" C: e5 P' A4 P5 E- D
另外最好有FFT 分析 TH D 成份:lol:
原帖由 nocturne 于 2008-3-4 10:29 发表2 ~0 W/ C$ r5 y+ |9 A b
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这个,,,
其实呢,,,
是阿娇的一贯风格啦。。
原帖由 sd-iori 于 2008-3-4 17:34 发表
Total Harmonic Distortion
Total Harmonic Distortion + Noise (THD + N) of the OP275
is well below 0.001% with any load down to 600 W. However,/ a) x/ i+ B, y3 M( i
this is dependent upon the peak output swing. In Figure 2 it is
seen that the THD + Noise with 3 V rms output is below
0.001%. In the following Figure 3, THD + Noise is below E2 {6 _; R2 `' R2 ?# [6 [
0.001% for the 10 kW and 2 kW loads but increases to above- \3 a4 Q, z4 a4 k; f8 P( R" t$ C
0.1% for the 600ÊW load condition. This is a result of the output
swing capability of the OP275. Notice the results in Figure 4,
showing THD vs. VIN (V rms). This figure shows that the THD- T# C/ B2 F1 r' J: h( x
+ Noise remains very low until the output reaches 9.5 volts rms.9 a) H+ R" k; K; q
This performance is similar to competitive products.
The output of the OP275 is designed to maintain low harmonic
distortion while driving 600 W loads. However, driving 600 W& r% i, ^* K8 ^2 c Q) Z! U
loads with very high output swings results in higher distortion if
clipping occurs. A common example of this is in attempting to
drive 10 V rms into any load with ±15 volt supplies. Clipping2 |: y) Y0 X; V0 ~9 p, a
will occur and distortion will be very high.
To attain low harmonic distortion with large output swings,
supply voltages may be increased. Figure 5 shows the performance C5 b0 Q7 ?8 ^- w
of the OP275 driving 600ÊW loads with supply voltages4 Q: Y, I8 ~0 d7 `
varying from ±18 volts to ±20 volts. Notice that with ±18 volt
supplies the distortion is fairly high, while with ±20 volt supplies7 x1 i4 T, Q# w5 p u# m1 F. J
it is a very low 0.0007%.
原帖由 MrGlass 于 2008-3-4 22:43 发表
看其它的帖子里有朋友说那个2132是很配SQ210W的" R: T5 f( D6 [3 u& {3 H- e$ S
阿娇大姐能不能给来点形象些的对比啊,这些数据和图表虽然高手喜欢,但是确实很让人头痛啊
另外为什么他们要叫你"阿娇"呢?
原帖由 酷风 于 2008-3-4 23:32 发表7 ~! t+ \/ ?' `( F y( C' @' ?: v
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那是因为多数声卡都是给运放提供低电压,所以才有这种说法
原帖由 bill_max 于 2008-3-5 07:07 PM 发表
最近我都去泡pchifi,,hifidiy这样的论坛了:shifty: ' x3 K* |6 P5 S+ \6 {
还好没米,多米的话就要败光了:devil:
原帖由 bill_max 于 2008-3-5 19:07 发表, L4 k# ], `6 ?7 Z
最近我都去泡pchifi,,hifidiy这样的论坛了:shifty:
还好没米,多米的话就要败光了:devil:
原帖由 ChrisVinyard 于 2008-3-5 00:06 发表
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不是也有飞线直接给运放供电的吗?!如果不在乎外观的话,换个好点的运放,飞线直接供电效果会更好咯?!
原帖由 flygg2006 于 2008-3-6 11:54 PM 发表* k- @) u! g5 j' n2 Y2 y
你没搞懂我意思。。。OP275摩卡就是感觉喂不饱。。。2134没试,2132P好N多。。。
原帖由 sd-iori 于 2008-3-7 13:28 发表
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做所有实验,,总要有一个基础,," P h5 b+ N& ?: \! _, V
不可能没样事情,,都从根本去搞,,,: L' P: U; z' _2 |# A: _" |
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:charles: 测量电压,,,是不是在开机的状态下测量,,
并联在供电引脚上??
原帖由 Dr.BT 于 2008-3-7 15:55 发表6 {7 K9 z3 U: e& m2 B* q6 n1 K8 u
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:sweatingbullets: 原来你们都不测的就教人家啊; \ |4 F s$ _0 {% N
btw,测试电压根本就是换运放要做的测试的很小一部分
怎么上升到了样样从根本去搞的级别了
原帖由 flygg2006 于 2008-3-7 03:07 PM 发表4 G$ W6 {! G( p& V% P
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那OPA2132系列就是低压王中王了。。。:a)
原帖由 Dr.BT 于 2008-3-7 15:55 发表7 \6 F4 E+ M, n j/ |, A
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:sweatingbullets: 原来你们都不测的就教人家啊
& I, W4 C8 `' ]5 C1 J
btw,测试电压根本就是换运放要做的测试的很小一部分0 l6 P2 x/ [2 u9 d. ? b
怎么上升到了样样从根本去搞的级别了
原帖由 sd-iori 于 2008-3-7 13:28 发表
做所有实验,,总要有一个基础,,7 [9 T5 K2 Q( V
不可能没样事情,,都从根本去搞,,,6 m: p: z& `: }/ V
:charles: 测量电压,,,是不是在开机的状态下测量,,
并联在供电引脚上??
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