关于最近销售很火的EASY A II的版本详细说明及简要评测

rpwt

交易区新帖推荐

适用高阻么？

yooyoo2004

下面是引用面包于2005-01-16 11:39发表的:

加了点私人信息~~

哪方面的的信息？

yooyoo2004

比如说，我用数码相机的锂电池改装一下，用数码相机的充电器充电，锂电池只用于供电，不知道这个方案是否可行？

yooyoo2004

必竞，我的数码相机锂电池是7.5V 1400ma的锂电，这样一来，数码相机和easy 2都可以使用了，请问技术上是否可行，我数码相机的锂电池有三块！~

manray

我已经收到成品货了，北京希望试听的可以来找我，我现在放假，很方便的．．．
关于一些朋友的问题，明天我会在另一个帖子里做说明．．．
还有winny先生在吗？您说明书里，说还有一中运放opa627，这个怎么样？有听过的朋友吗？

easya

下面是引用manray于2005-01-16 22:21发表的:
我已经收到成品货了，北京希望试听的可以来找我，我现在放假，很方便的．．．
关于一些朋友的问题，明天我会在另一个帖子里做说明．．．
还有winny先生在吗？您说明书里，说还有一中运放opa627，这个怎么样？有听过的朋友吗？

这个是摘自这里
http://www.tangentsoft.net/audio/opamps.html
两者都是很好的运放，但是用在低电压下ad8610似乎更适合，627也更加耗电
ad8610
This is quite possibly the best chip for battery-powered amps, period. Its voltage tolerance is among the lowest of all the chips I mention here, it has good output current abililty, it has among the lowest supply current of any chip reviewed here, and above all it sounds good.

What does it sound like? Well, take the AD823, and remove some of the aggressive harshness. Add a bit of detail and smoothness from the AD843. That's the 8610. It's not a smooth chip, just not harsh. It's not the most detailed chip, but not heavily veiled, either.

This chip is rare in that it is only rated for a 26V supply. (Absolute maximum is 27.3V.) Another oddity is that it is only available in SOIC versions, so you need to mount it on a Brown Dog adapter to use it in amps that use DIP chips.

Bottom line: This is a contender for my favorite chip of all time, especially in battery-powered amps. When paired with an aggressive or very revealing system, this chip can be unpleasant. This chip is at its best complementing a smooth, laid-back system.
opa627
The first thing I noticed is the cleanliness of the sound. With this chip in the test amplifier, I heard known problems in a low-end portable source more clearly than with my reference for this test, the OPA134PA. The 627 also seems to do better on recordings with room ambience: it reveals details about the acoustic space that the OPA132/134 chips will hide, making them sound "flat" in comparison. But these two chips are more alike than different. Both have the characteristic laid-back and dark Burr-Brown sound, and both are very tolerant, stable chips.

The only remaining differences are that the OPA132/134 family will work well below 9V, whereas the 627's performance falls off a cliff below the clipping points I give above. There does seem to be a bit of extra low bass impactfulness with the 627. This seems less to be "extra power" than a removal of some heavier thumpiness in the 132/134 — the 627 seems to have a truer, more refined kind of bass.

In all my testing, I've been unable to hear a difference between the OPA627AP and the OPA627BP. The datasheet says that the differences between the grades are in the DC specs, so this is not surprising.

Bottom Line: The sonic differences between the OPA627/637 and the OPA132/134 are of the "last 5%" variety, rather than providing a dramatically different sound. If you like the Burr-Brown sound and can stand to pay 14× as much as for an OPA2134PA, a pair of OPA627APs is a reasonable investment. I see no reason to pay extra for the B grade in an audio application

Bottom Line: The sonic differences between the OPA627/637 and the OPA132/134 are of the "last 5%" variety, rather than providing a dramatically different sound. If you like the Burr-Brown sound and can stand to pay 14× as much as for an OPA2134PA, a pair of OPA627APs is a reasonable investment. I see no reason to pay extra for the B grade in an audio application.

doubletree

是说opa627细节表现力稍好，可以表现出OPA2134PA掩盖的一点细节。但价格却是OPA2134PA的14倍，相比实际声音表现只有5％的变化，而不是声音有明显改变，因此适合有钱人发骚。opa627在9v输入时有点性能波动，导致的声音变化是低频增强，反而使低频显得好听。

8610比AD843细节多一点点且声音平滑，小的输入就有大的电流输出，声音表现非常好，适合做电池功放，比较而言细节并不是最出色，但也没有刻意掩盖掉一些细节。

是这样吗？

easya

差不多，个人的感受还会稍有差异。我觉得搭配ad8610x2运放版本就相当不错了，这也是阳光、vineland等板主听后共同的意见。