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自制耳机放大器
手持 Mini 键盘

自制全分立元件 OP 式耳放

galeki posted @ 2010年2月09日 10:31 in 单片机 , 12989 阅读

上次的简易的耳放制作完成之后,兴趣也被勾了起来,正好继续补习模电的知识,顺便把这个耳放加强一下吧~

前级完全 OP 化了,在洞洞板上和雕刻板上尝试了好几天才把这个电路正确运行起来,虽然里面还有一些疑惑,不过经过这么一折腾,比看书的认识深多了。

全部用了分立元件,连稳压器部分也只用了三极管和稳压管,只要外接一个 24V 的电源,通过稳压器稳压后到 20V 左右,就可以使用了~

一般来说功放都是设计成正负双电源的,网上搜到的设计图也都是如此,但是为了省事,就用了单电源,用中点当做零点,所以 20V 单电源相当于 +10V -10V 的双电源,我也不知道图中的偏置方法是否正确,总之运行得还不错~

 

最终的外观相当华丽~    本来想用廉价电容来焊,但是发现手上的廉价电容都是 16V 耐压的,无奈只好拿出很久之前买的发烧电容(50V 耐压),最后就成了看上去很奢华的耳放了。

废了相当大的功夫焊接完毕,非常走运没有什么问题。听感比上次的廉价耳放好多了,声音非常平衡,导致感觉有点冷 :D。

不过还是有点小遗憾,电源部分忘了一个误差电容;右边中间的两个三极管离得太近了,装上散热片就快靠在一起了,而且正好是一个 +20V 一个地,安装的时候不小心用剪刀短路了一下这两个散热片,结果打了一个很大的火花,剪刀的一个尖还粘在了一个散热片上,太汗了……

此外为了调节音量,输入那边搞了一个双联的电位器(左边中间那个旋钮),但是这个电位器精度太低了,满值 10K,转到中间左右,两个值一个 5K,一个 5K4,误差快 10% 了,老有心理作用觉得两个声道不平衡,所以最后干脆拆了下来。

静态总电流 100mA 左右,功放管很烫,不过加了个小的散热片之后就比较温了,这个应该算作什么类的放大器呢?A 类?B 类?AB 类?目前对这个分类概念也不是很清楚。

为了测试耳放,还给 ER4 配了一条高阻线,说是高阻其实也只有 80 欧而已。原来一直觉得换线会改变声音是胡扯,但是这次换上高阻线之后的确声音有变化,声场变大了,层次更清晰了。原因不是很清楚,大概是阻抗可以抵消掉耳机的部分容性或感性负载的比例的吧,这样就可以让输出更加线性;另外高阻抗强制输入端必须提高音量,这样底噪占得比例也会变小。

有机会把前级改成集成的 OP 芯片看看有没有区别,自我感觉应该差别不是很大。虽说差分对三极管如果没有精确配对会带来误差,但是 Vbe 的差别虽然被放大,因为在单电源的情况下输出有电容耦合,所以直流的部分并不会被输出。hFE/Ic 之类的差别,可以被发射级电阻抵消大半,所以即便不如 OP 也不应该很明显的听出来才对。 至少用分立元件总体噪声会少,频率特性应该也会变好,此外也可以自由在各个部分选择特殊的三极管或者灵活的设计。我估计着,如果在差分部分用上孪生对管,再在各个部分用上用上高品质的三极管,最终的效果应该会超过 OP 才对,也许 HIFI 级别的功放里面都有大部分的分立元件,也是因为如此吧。

以这个东西为标志,模电三极管的补习算是告一段落。

以后就用这个耳放听歌了~ :D


 

接下来继续补习其他的东西……汗

趁着春节前的工作日,赶紧买了一些电感和 pF 级别的电容,春节期间看看高频的内容吧,这部分貌似也挺好玩的~

 

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Avatar_small
savor 说:
2010年2月09日 16:48

很强大啊!我也想自己做一个,要不然本科学的模电就全忘了XD

Bill 说:
2010年2月09日 23:19

相当牛呀~学了一学期模电我都还是什么都不会做…

Avatar_small
galeki 说:
2010年2月10日 04:04

@savor: 做吧做吧~ :D
@Bill: 我也是半参考书上做的~

Head_small
K*K 说:
2010年2月12日 05:16

很强大啊,我老爸也是机修师,这种电路图我从小就能看懂的。

不过到现在还是没有动力自己去搞一个,回头发给我老爸,一起研究一下!

Avatar_small
galeki 说:
2010年2月12日 06:05

@K*K: 拜强人~ 话说我也想对这个再改进一下,一起设计吧~ :D

bpxyz 说:
2010年7月20日 18:57

你的电路板是自己硬刷的?

Avatar_small
galeki 说:
2010年7月20日 23:49

电路板是在外面加工厂做的~

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