c*****n
发帖数: 949 | 1 perliu－ 你耳房上的胆是12AU7的吗？
刚刚我在网上google各种胆管，看到了如果胆管不配，可能会导致你耳房的情况。
－－－－－－－－－－－－－－－
from http://music-electronics-forum.com
12AU7 will probably work fine in the phase inverter position (right before
the power tubes),or reverb driver.... In most vintage amps with good quality
plate resistors it will be OK in the other preamp stages, ...I would be a
little careful with some modern PCB/budget amps with this though, 12AU7
draws significantly more current than a 12AX7 and migh possibly burn up a
plate re |
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f****i
发帖数: 20252 | 2 去年买的打折声卡，接上入耳耳机底噪很明显，尤其是晚上。今天稍微修改了一下输出电路的元件，把耳机信号衰减了6dB，底噪明显减少，打开“crystalizer”也不会觉得刺耳了。
做法：
把XMOD翻过来，把防滑垫子的四个角掀开（剪掉），卸掉露出的螺丝。黑色的底板在XMOD
的腰部两侧各有一个卡子，小心撬开，然后可以卸掉底板，露出一片PCB。
把固定PCB的一个螺丝拿掉，然后把正面的音量旋钮拔下来，把PCB拿下来。
PCB上标着HP字样的立体声插座是耳机接头（参考盖子）， 顺着信号线找到R80和R82。
R80和R82是个0欧姆的jumper resistor，C76和C75是小于1nF的高频滤波电容，R81和
R83未使用。
将R80和R82换成16ohm的0402贴片电阻，R81和R83装上32ohm的0402贴片电阻。
顺便也把C76和C75换成了0.22uF（或0.44uF）的电容，对应约为40kHz（或20kHz）的低通滤波。电阻用的是1%精度的，电容用的是10% X5R的陶瓷电容。
图为改过以后的电路板。
电路为：
HPL driver ------R80-----------... 阅读全帖 |
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D**********s
发帖数: 3139 | 4 Check receiver(interfaces), dac, opa model number, see the cost and
performance.
Then check out the pcb board and quality of the resistors, caps, transformer
, etc., which matter a lot in such a level circuit.
500 dollar can do a lot things, don't abuse. |
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n***m
发帖数: 127 | 5 有人感兴趣么
CAD - Physical Verification / Synthesis
CAD - Timing - Resistor level
CAD - Formal Verification
CAD - Custom Cad - Virtuoso Platform Development
CAD - Layout |
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o****l
发帖数: 33 | 6 let x=probability that they came from Box A
let p(A)= prob. that A is selected
obviously p(A)=50%.
given p(A),the probability of 3 resistors defective p(def3/A)=5/50*4/49*3/48
so p(def3/A)*p(A)=p(A/def3)*p(def3)
now p(def3) is unknown;
But x=p(A/def3)=5*4*3/(50*49*48) *0.5/ p(def3)
similarly 1-x=p(B/def3)=10*9*8/(100*99*98) *0.5/ p(def3)
so that we have x/(1-x)=5*4*3*(100*99*98)/(10*9*8*50*49*48)=0.6875
x=0.6875/1.6875=40.74% |
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o****l
发帖数: 33 | 7 题目好像有点歧义
1.每取一个resistor 都可以randomly 从A或B 中取
2.先随机选定一个box, 再在这个box里随机取3个。 |
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o****l
发帖数: 33 | 8 Three resistors are taken from one of these Boxes, selected at random.
我的理解就是先随机选定一个Box, 再random 挑3个。
不同人对原题的理解确实不一样，要是我面试时肯定要向interviewer clarify的
另外：考没考过跟歧义与否没有关系， 在没clarify之前，我想请教一下我的理解有什
么问题？
我倒是看不懂 50/150 跟p(A)有什么关系，又不是从150里随机挑50个放进A里。
你不妨展开说说？ |
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p****3
发帖数: 448 | 9 Let
A be "box A was chosen"
B be "box B was chosen"
D be "all 3 resistors were defective"
Using baye's rule:
P( D | A) P(A)
P(A | D) = --------------------------------------------
P(D | A) P(A) + P(D | B) P(B)
Where P(A) = P(B) = 0.5
And we get result 0.407407407... |
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c***s
发帖数: 5 | 11 MS in EE
Basic device knowledge-CMOS, BJT, Diode, resistor, etc.
Experience in device characterization
High voltage experience preferred
Some Excel Macro and C programing experience preferred
Layout experience preferred
Prefer located in San Jose |
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t****t
发帖数: 610 | 12 Capacitor. Check Graiger. Ususally about $20.
I changed two in the past 4 years. Be sure to safely discharge the old one
by using a resistor, and then measure its capacitance (you will need a good
multimeter). |
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t****t
发帖数: 610 | 13
Big no no for 2!!!!!! If the capacitor holds a lot of electrons, you may
cause explosion!!!
The right way is to use a proper size (resistance, power) resistor to
discharge it. |
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s*****d
发帖数: 469 | 14 NOLES is correct, that's what I do. They sell a discharging tool but to me
it's just a piece of expensive junk. I believe it's just 2 probes with a
high value resistor in between.
Sean 的方法应该是专业的。我昨天换电容时是按youtube上几个video包括一些有
license的方法：long screwdriver with plastic han........ |
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i***e
发帖数: 9429 | 15 这个感应器要装到室外去的，尽量避免遇到太阳光。
或者拆掉，再原位上装个manual mode resistor。 |
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p***l
发帖数: 1391 | 16 空调的问题
要换一个blow motor resistor
问了几家人工都要85以上，
哪位知道哪有便宜点的 谢谢了
在Evanston 附近 |
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n***b
发帖数: 5914 | 17 【 以下文字转载自 twincity 俱乐部 】
发信人: nojob (大笨福 (faint 呀 faint)), 信区: twincity
标 题: 问硬工/EE一个问题
发信站: BBS 未名空间站 (Tue Dec 21 15:59:35 2010, 美东)
carbon film resistors 主要作用是什么？ |
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n***m
发帖数: 127 | 18 【 以下文字转载自 JobHunting 讨论区 】
发信人: nicam (吹吹风), 信区: JobHunting
标 题: 果园招人
发信站: BBS 未名空间站 (Tue Mar 20 20:42:13 2012, 美东)
有人感兴趣么
CAD - Physical Verification / Synthesis
CAD - Timing - Resistor level
CAD - Formal Verification
CAD - Custom Cad - Virtuoso Platform Development
CAD - Layout |
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s****g
发帖数: 1028 | 19 跳闸 is caused by a short in your circuit.
To 自己换 maybe difficult for you based on your questions asked so far.
怎么换 is actually kind of east, turn off the elec to the unit, disconnect
the elec (usually loose a few screws holding the wires behind a cover),
drain water (there should be drain valve at the bottom of your unit),
disconnect the pipes (should be two).
To install, buy a new one of the same size (not just in gallon, but also in
shape, some are short and fat, some are more slim, if not you ... 阅读全帖 |
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S**********s
发帖数: 4534 | 21 tear gas? pffffft.
I was trained with tear gas and inhaled it on a few occasions.
it causes some irritation, make you cough and your eyes water a little bit.
I was irritated, but not so much that i can't hit a man-sized target in room
distance. and some people are born immune to them.
the same goes for OC spray. it also has no effect whatsoever on meth heads.
it hurts like hell when you get sprayed in the eyes, but I wouldn't count on
that when your opponents have guns and knives, that shit is f... 阅读全帖 |
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s****r
发帖数: 31686 | 22 .50ohm, 10W,power resistor, jamoco.com
应该问是多少欧姆的 |
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D*******a
发帖数: 3688 | 23 (sorry can't type chinese)
the problem is, even at 0.5w op level, it is still too loud....my wife will
kick me out if I turn up the volume...
I wish they separate the gain and volume control. Maybe I'll have to add
some variable resistor between preamp and power amp so that I can get some
overdrive while keeping total volume low... |
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k****t
发帖数: 12697 | 24 为啥不能A? 不就是个RING RESISTOR 吗? |
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k****t
发帖数: 12697 | 25 不是这么说. NIKON 不是从八十年代开始就吹继承性, 照顾忠实的老用户. 弄到最后是
继承性最差的, 太师好歹割了后还能收缩光圈测光. 继承性超好的NIKON 反倒是整个不
行的.
TOY 级机器不考虑也罢了, D90 中档即使人当时不定用也得给人个OPTION 想用时也能
用不? 好象D90 定位至上跟D7K 一样高虽然老点.
一个RING RESISTOR 几块钱, NIKON 太CHEAP |
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k****t
发帖数: 12697 | 26 至少C,M,P 用手动光圈头能AV, N家俺没有阉了RING RESISTOR 的机器试验, 只是理论
上推测.
还有,PRESET 镜头不是这意思, PRESET 是两环头. |
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b**********n
发帖数: 692 | 27 Change the coil resistor fluid! |
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c****t
发帖数: 19049 | 28 HALF-LIVES
the first luisa rey
mystery
I
Rufus Sixsmith leans over the balcony and estimates his body’s velocity
when it hits the
sidewalk and lays his dilemmas to rest. A telephone rings in the unlit room.
Sixsmith dares not
answer. Disco music booms from the next apartment, where a party is in full
swing, and
Sixsmith feels older than his sixty-six years. Smog obscures the stars, but
north and south
along the coastal strip, Buenas Yerbas’s billion lights simmer. West, the
Pacific eternity East... 阅读全帖 |
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t**********d
发帖数: 638 | 29 most of the people in US know most of the words you mentioned here. In fact,
there are pre-fix and post-fix (?) in lots of words. When you know the
meaning of the stem-word, you know all of them. for example, butane, pentane
, hexane, heptane, octane..., legal, illegal; known, unkown; lz needs to
lean more English in order to 触类旁通.
let me tell you what I know about the words you mentioned here: hallination,
“四环素” (I do not think people use this here)、“变阻器” (variable
resistor), calcium carbonate, |
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h**g
发帖数: 94 | 30 1) Transistor small signal model, gm, ft
2) Simple amplifer Gm, Rout: common source, common gate, source follower
3) Current mirror, Layout matching
4) Cascode amplifer, Cascode current mirror
5) Differential pair: gain, bandwidth, swing
6) Opamp with miller compensation
7) Opamp with feedback: resistor, capacitor
8) Bode plot, phase margin, pole shifting
9) Transistor noise model
10) Basic equations for diode and BJT
I took many phone/on-site interviews recently. All these questions were asked |
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g****t
发帖数: 31659 | 31 你看看smartphone的size,
想想看加个gryos要不要重新测散热.----说不定你还要加
外围filter,thermal resistor等好几个部件.
别用废话这个词。你这样说说明你对这个是外行。
我本来不想说这么直接的。你做MANAGER的也是这么跟你
下属说话的？ |
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g****t
发帖数: 31659 | 32 文傻的是你.
我给你举个最简单的例子.
有的手机里面,为了省钱,PCB trace直接当sensor resistor用的.
你板子上加个mems芯片,然后再几个外围filter,
说不定以前调试的东西就不灵了.就得改firmware
你讲的这些用语，啥散热，啥干扰，傻calibrate板子，连俺这个业余电子爱好者都看
不下去。看似文傻吧。 |
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g******u
发帖数: 3060 | 33 hardware is nothing related to coding at all.
hardware in electronics is resistors, capacitors, transistors....
hardware in mechanics is relays, solenoids, ...
Protection is safely realized by those stuff, not CPU, even though CPU
should know what's wrong.
registers, cpus, those are embedded related stuff, in reality are still
software driven. |
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ET
发帖数: 10701 | 34 CREATE TABLE model_by_res (
res_id SMALLINT UNSIGNED NOT NULL,
model_id TINYINT UNSIGNED NOT NULL,
PRIMARY KEY (res_id, model_id),
CONSTRAINT fk_model_by_res_res FOREIGN KEY (res_id) REFERENCES resistor (
res_id) ON DELETE RESTRICT ON UPDATE CASCADE,
CONSTRAINT fk_model_by_res_model FOREIGN KEY (model_id) REFERENCES res_
model (model_id) ON DELETE RESTRICT ON UPDATE CASCADE
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
dont' know why yah? |
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t****g
发帖数: 35582 | 35 不是voltage吧，一般都是PWM控制，主板上的thermal resistor通过A/D读进
controller，然后通过一个PWM引脚控制fan第三线上的MOSFET开关通过fan的电流。
your |
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c**i
发帖数: 6973 | 37 (1) Paul Boutin, The Problem With Success; With a market capitalization of $
184 billion, can Google maintain its reputation as a brash iconoclast? Wall
street Journal, Apr 7, 2011.
http://online.wsj.com/article/SB100014240
52748703712504576243483407048582.html
(book review on Steven Levy, In the Plex; How Google thinks, works and
shapes our lives. Simon & Schuster, 2011)
Quote: "In Mr. Levy's telling, the ultimate test comes when the company
attempts to conquer the Chinese search market. Hoping... 阅读全帖 |
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e********g
发帖数: 2524 | 38 ft. 好像是我的a50的问题，只有3 pin fan connector，没有control signal
自带一个resistor可以把速度降到1600rpm |
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S*A
发帖数: 7142 | 39 A lot of adapter has protection resistor on it.
It is OK to use on both 3.3V and 5V. |
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s*****m
发帖数: 13092 | 40 话说卖的那种降压线有用吗？resistor cable，就是带个电阻 |
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d******a
发帖数: 32122 | 41 建议你买个质量高点的
到Amazon搜：
UGREEN USB-C to USB 3.0 A Female with 56k Ohm Pull-up Resistor for USB Type-
C Devices |
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x*******x
发帖数: 2 | 42 It looks like a thermistor (Thermal Resistor). is that coming from your rice
cooker?
you may buy it in a local electronics store or buy it online. |
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z*****n
发帖数: 7639 | 43 If you didn't look into the circuits inside,
how can you assert that there is no current-limit
resistors?
The correct way to find datasheet of that type
of LED and see the circuiting specification. |
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c*******l
发帖数: 4801 | 44 packaging的话，弄点最基本的resistor, cap, inductor etc看看就成了吧 |
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f*****0
发帖数: 489 | 45
a battery if very non-ideal due to its poor high frequency response.
depending on the application, a dc source with a resistor and fast capacitor
(ta or polyester capacitor) can do it. |
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j***j
发帖数: 324 | 46 高压mos thres会高一些，而且一般都要加driver电路，会有pull down的resistor的。 |
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w********u
发帖数: 90 | 47 可以试试，分立器件，很多东西都可以实现，比如大的inductor ,cap, resistor. |
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f*****0
发帖数: 489 | 48 on further reflection, I think it is much easier for you to use one of those
audio power IC (tda2030, tda2003, lm1875, etc.). they are usually in a
to220-5 package, and you need a few resistors to get it to work. they are
10w power amps into 8ohm so it shouldn't be difficult to drive 500ma (unless
your load is super tough). |
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