ningmeng7294 发表于 2010-9-26 20:23:57

发一个完全开源的耳放,有靓图,嘻嘻

有冇人有兴趣?板约20元美金,零件另计,可以用单节9V或双9V的电

http://www.head-fi.org/forum/thread/419563/the-pimeta-v2-thread


http://cache.amobbs.com/bbs_upload782111/files_33/ourdev_585798WHW6DF.png
(原文件名:brd-2.01.png)

http://cache.amobbs.com/bbs_upload782111/files_33/ourdev_585799TTPSQJ.jpg
(原文件名:ER1.jpg)

http://cache.amobbs.com/bbs_upload782111/files_33/ourdev_585800B8TU9L.jpg
(原文件名:ER2.jpg)

http://cache.amobbs.com/bbs_upload782111/files_33/ourdev_585801RE6V8Z.jpg
(原文件名:ER3.jpg)

点击此处下载 ourdev_585802H3ON6X.pdf(文件大小:46K) (原文件名:sch-2.01.pdf)

huwenhui 发表于 2010-9-26 21:50:17

很漂亮,20美金也不贵,元件貌似也不难找啊。不错

millwood0 发表于 2010-9-26 23:12:20

the design is based on Walter Jung's composite amp: a voltage opamp driving a buffer with global feedback on the whole thing.

a few things to consider:

1) the design's input offset is not balanced. R2 is too big.
2) there should be a resistor on the output.
3) the design uses high speed opamps and then slow them down with capacitors in the feedback loop.

if you look at the history of the designs and what its designers champaigned for their earlier designs, you will see that they had talked about how great an improvement it was to load the opamp with a CCS (into class A operation) and how noticeable of an improvement that has been, and only to see their drop that "innovation" here and went back to a traditional design, :).

you can save your time / money / efforts: a tpa6120 or the good old ad815 (<$2 each, for two channels, good for 500ma per channel) will beat the design hands down.

mjsong 发表于 2010-9-28 23:29:24

呵呵 看楼上的回复要进http://translate.google.cn/

同样觉得R2太大了 电路增益太大

esdart 发表于 2010-9-28 23:33:24

不错,收藏。

mowin 发表于 2010-10-1 22:25:31

回复【2楼】millwood0
-----------------------------------------------------------------------
millwood0多个贴中推荐xDSL driver做放大器,列出种种好处,比如:
1)10欧负载时亦能得到至少400mA驱动电流
2)900V/uS+的压摆率
3)120MHz带宽(与增益无关)
……
抵挡不住诱惑,决定用AD815AYS做一个耳机放大器

mjsong 发表于 2010-10-1 23:33:38

xDSL driver?电流模?
我也有打算

mowin 发表于 2010-10-2 00:06:41

AD815是高输出电流的差动驱动。多应用于xDSL线路驱动器(x=A/H/V,国内多是ADSL),双绞线驱动器等。属电流反馈型运放
据millwood0说,AD815这类器件相当于cfb-OPAMP+BUF结构,请参阅大胡子的贴的一楼
上AD815的PDF,有兴趣的看看,点击此处下载 ourdev_586942HMTFQF.pdf(文件大小:336K) (原文件名:AD815.pdf)

ningmeng7294 发表于 2010-10-28 17:20:41

刚淘了两颗AD815ZIP封装的,准备抽时间恶搞一下,呵呵,

zhxlx 发表于 2010-11-8 17:22:45

有意思,标记一下。

fshunj 发表于 2011-3-16 19:41:11

标记下

at90s 发表于 2011-3-16 19:50:56

mark ad815

lqdjdy 发表于 2011-3-16 20:51:28

不错,板子很漂亮

poet_lee 发表于 2011-3-26 11:16:25

不错

huayuliang 发表于 2011-3-26 13:02:57

回复【8楼】ningmeng7294
刚淘了两颗ad815zip封装的,准备抽时间恶搞一下,呵呵,
-----------------------------------------------------------------------

ZIP ? 是啥封装?

chenzy_jpe 发表于 2011-3-28 12:41:17

20美金,贵啊!!

nbc327 发表于 2011-4-13 22:12:08

看看!

bluelool 发表于 2011-4-13 22:27:58

mark

cumtguojp 发表于 2011-5-2 21:53:38

mark

ggaaoo 发表于 2011-5-21 15:18:15

mark

generals 发表于 2011-5-23 17:43:30

路过,瞧瞧!

dhy13 发表于 2011-9-5 13:31:24

mark!

hackerboygn 发表于 2012-12-21 15:31:31

弱问,为什么要把“地”单独拿出来作为一路,什么用意啊,降低地上的噪音?

FishInWater 发表于 2012-12-30 22:20:37

mark{:tongue:}

wjyxyp1 发表于 2013-1-2 21:37:18

不知道效果属于哪个档次的?

zgxcom123 发表于 2013-1-2 22:07:51

学习一下ad815
哈哈~

red_pig 发表于 2013-1-2 22:21:58

电源是亮点!

jackass1976 发表于 2013-1-5 17:07:17

进来学习学习。
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