t****t
发帖数: 610 | 1 Make sure u cut off power supply first. Do not connect any two terminals of
the capacitor. If you dont feel safe, just inspect it. A bad capacitor will
have a bulged end, but not always. |
|
u****q
发帖数: 24345 | 2 我的capacitor去年坏的时候研究了一下。印象中读过快坏的capacitor会造成效率下降
。。。自己研究一下吧。 |
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i***e
发帖数: 9429 | 3 tolive
2013-10-25 14:25:06
来自: 0.0.
560
求助 imore：
这几天我发现我家一个 Heat Pump 晚上一直不停，到室外看 Condens...
tolive
2013-10-25 22:09:54
来自: 0.0.
563
晚上回家试过了，室外 Condenser 的风扇不转了，Heat Pump 早上出门的时候就关掉
了...
tolive
2013-10-26 17:43:13
来自: 0.0.
574
因为我家有三个一模一样的 Trane XE 800 2.5 Ton Heat Pumps，其中一个风...
tolive
2013-10-26 20:43:01
来自: 0.0.
577
老大你误会了，我是今天上午换完 Start Capacitor 和 Run Capacitor 不行...
tolive
2013-10-27 16:19:02
来自: 0.0.
582
其实买买提最最有用的帖子就是你这种帖子，我相信你的空调贴鼓励了版上不少人自己
动手，如果不是因为你这...
tolive
2013-10-29 11:43:41
来自... 阅读全帖 |
|
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s*****d
发帖数: 469 | 5 我说,大家是不是读博士将脑子烧坏掉了?这个原来就根本是个不是问题的问题,放个电(
或企图放个电)多大点事儿啊?本来大多CAPACITOR里就没有电可放,只是以防万一而已.
跟你们交个底,我从来就不用SCREW DRIVER放电,拆下CAPACITOR以后将2/3接头直接向机
壳上触碰,基本就听到过一次"啪"打火. |
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s*******y
发帖数: 46535 | 6 最近天热，start capacitor坏的不少
我前一阵请人来修过，当时以为是更严重的毛病，要是知道是capacitor问题，自己可
以换 |
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N*****9
发帖数: 543 | 7 楼上说的有道理。如果光风扇转，压缩机没声的，有可能是capacitor坏了，压缩机不
能启动。youtube看看，用万用表检查一下。我碰到过，ebay买个capacitor换上就好了
，大概十几刀吧。安装时注意放电，youtube找的到
说了里外机器都转的... |
|
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e******y
发帖数: 17 | 9 很可能是capacitor旧了，换个新的capacitor应该可以解决问题。如果还不行，那就是
control board,换control board
kind |
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R*********4
发帖数: 293 | 11
不是俗气不俗气，如果你平时就维护你的大house，你就知道该怎么做了。有个划不划
得来的问题。
空调外机这种东西，如果动手能力不强，真的不建议自己弄。特别是对电容放电都怕的
。你想，你戴个手套，戴个护目镜话，有必要怕吗？
看看你家的工具箱，万用表，起子，还有最重要的电工胶布，手套，基本上house的东
西都不用怕。
google搜个 check capacitor, replace capacitor, 没有万条也有千条，除了
拨风扇，所有人的答案你都能看到。
所以我根据您的情况给的意见是，如果只是跟电容有关，最好找人。 |
|
y*j
发帖数: 3139 | 12 经验都是学来的，没有人天生就会。关键是动手之前，安全第一。
而且了解之后，即使请人，也知道怎么回事。比如空调坏了，要立刻停机，把外面的开
关断电，防止更大的损害。
说实话，$100实在不多，你想在这么热的天，来回奔波也很辛苦。
：不是俗气不俗气，如果你平时就维护你的大house，你就知道该怎么做了。有个划不划
：得来的问题。
：空调外机这种东西，如果动手能力不强，真的不建议自己弄。特别是对电容放电都怕
的。你想，你戴个手套，戴个护目镜话，有必要怕吗？
：看看你家的工具箱，万用表，起子，还有最重要的电工胶布，手套，基本上house的东
：西都不用怕。
： google搜个 check capacitor, replace capacitor, 没有万条也有千条，除了
：拨风扇，所有人的答案你都能看到。
：所以我根据您的情况给的意见是，如果只是跟电容有关，最好找人。 |
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k***5
发帖数: 393 | 13 测了一下capacitor, 是好的。45 uF 和5 uF。
进入control box的线是有240左右，不过outside unit（condenser和fan）一点反应一
点声音都没有。
control box里面很简单，只有capacitor和contact，没看到control board。
测了一下24V，（是测contact的两边吗？）没测到，不知道是不是测错了？ |
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J***e
发帖数: 116 | 14 楼主先测contactor好坏
Thermostat 设为 on, 然后把温度设很低，等久一点或者听到click声, 到户外 24Vac
应该要检测到，两边240Vac 也要检测到，contactor才是
好的
在contactor判断为好的情况下，才能说capacitor是坏的
Capacitor的作用是在正常供电情况下create a rotating magnetic field |
|
发帖数: 1 | 15 HD和Lowes不许卖这种capacitor.到ebay， amazon上看看,价格便宜。注意一定要买一
样specs的capacitor: 包括voltage 和farad. |
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b****n
发帖数: 3343 | 16 Check these 2 from the outside unit first. Need be very careful.
1) condenser fan motor start capacitor
2) condenser fan motor
If the condenser fan doesn't spin, it's better to shutdown the AC. The
compressor might overheat.
It costed me $300 to have condenser fan motor replaced. BTW, my unit doesn't
have condenser fan motor start capacitor, which is not typical. |
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v**********p
发帖数: 88 | 17 小弟正在找美国博后位置，求各路大神推荐，不胜感激！
Seeking Postdoc Position in Synthesis of Graphene and its analogues and
their applications as Actuators, Flexible Electronics, or Energy Storage
Devices, etc.
ResearchGate: http://www.researchgate.net/profile/Ji_Chen15
GoogleScholar: http://scholar.google.com/citations?user=5mIpywIAAAAJ
E-mail: [email protected]/* */
Publications
1.Water-Enhanced Oxidation of Graphite to Graphene Oxide with Controlled
Species of Oxygenated Groups
J Chen, Y. Zhang, M Zhang, Y Li, L... 阅读全帖 |
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S**C
发帖数: 2964 | 18 So you want to build an equivalent of gas tank in a gas station? Get a
chance to calculate how many super capacitors are needed to build a capacity
for a few hundreds cars at 80 kWh each? For each charge, at what voltage
and what current? Take 80 kWh, 240 V to be safe, 5 min, you need 4000 Amps,
without any parasitic loss. I am sure it is going to be fun to play with
4000 Amps cable, I want to be no part of it though.
Super capacitors on car? You mean BUS right? Car? |
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C*********r
发帖数: 2671 | 19 现在研究方向：
surface science/sol-gel/AFM/XPS/Glass/Corrosion
以前做过的方向
Dielectrics/Sintering Flux/Photocatalytic films/Eletrochemical capacitors/
multilayer capacitors/high strength glass foam
小弟诚求一切可能的审稿机会，以前project比较多比较杂，有过审稿经验。
多谢大家能考虑小弟。
联系方式:私信
再次感谢 |
|
f*********6
发帖数: 94 | 20 Oops, I had a same problem last week, and my AC did not work in such a
sizzling hot week. It turned out that the capacitor was broken. After
replacing it with a new one (100$), it works again!
If the capacitor is broken, the fan outside won't work.
得1 |
|
l******n
发帖数: 115 | 21 看看室外机风扇转不转。不转的话用筷子拨一下，看能不能转起来。有可能是
capacitor 或是 conductor的问题。你如果不是很清楚怎么测capacitor和conductor的
话，还是找人吧。 |
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s*****a
发帖数: 1269 | 22 风扇是室外压缩机散热风扇吗?室内风口有风吹出来吗？我上次就是这个问题，就换了
个capacitor。位置是室外压缩机机箱里。
如果是室内风口没风，那是furnace里的blower的问题。位置是attic或者basement。我
家的carrier空调把blower出来的到电路板cool的黑线接到L1上的黑线，可以判断
blower是否还转。另外blower也有capacitor。空调刚开后你可以在furnace附近听听有
没有click，就是relay继电器切换的声音。没有的话可能relay坏了或者整个控制电路
板坏了。
如果看不懂，google is your friend，再不行就请人吧。
还有，现在很多空调从系统到配件有10年到20年保修。如果系统出了保修期，你可以试
着给当初安装空调的公司打个电话，也许他们会派人上门诊断。问清楚毛病，不要他们
修，自己网上买零件自己修。 |
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z**k
发帖数: 65 | 23 Samsung? I fixed one for myself, replaced power on capacitor. I gave the
rest capacitors to my workmate and he fixed his too. Open and look at the
board, check it. Search in youtube, many cases. |
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B*****i
发帖数: 583 | 24 Indian-American teen invents 20-second charger
An 18-year-old Indian-American girl has invented a super-capacitor device
that could potentially charge your cellphone in less than 20 seconds.
Eesha Khare, from Saratoga, California, was awarded the Young Scientist
Award by the Intel Foundation after developing the tiny device that fits
inside mobile phone batteries, that could allow them to charge within 20-30
seconds.
According to Khare, her device can last for 10,000 charge-recharge cycles,
comp... 阅读全帖 |
|
b***e
发帖数: 4591 | 25 ☆─────────────────────────────────────☆
echocc (echo) 于 (Sat Nov 27 23:25:02 2010, 美东) 提到:
才用了3年，今天突然坏了，转完了东西一点儿也不热。网上一查，买个新的要200多块
。找人来修肯定不划算。琢磨着能不能DIY。
前几天车库门忽然关不了了，我心想完了，找人来修起码一两百。我拿出说明书一查，
说是门关不了可能是sensor没对好。我四处检查了一下，发现是sensor边上的电线脱开
了，把两个电线接上，车库门又work了。回头我搞个电烙铁把电线都焊焊好
☆─────────────────────────────────────☆
QuK (等待·远航) 于 (Sat Nov 27 23:27:06 2010, 美东) 提到:
赞理工女生，开辟第二职业
☆─────────────────────────────────────☆
MindCruncher (头脑发热，再度) 于 (Sat Nov 27 23:47:16 2010, 美东) 提到:
任何电器不工作，... 阅读全帖 |
|
c*******g
发帖数: 1048 | 26 多谢各位的信息
我后来翻了一下opener的manual，发现motor 10年warranty， parts 2年
给厂家打电话，一听说是冒烟了，马上说是capacitor坏了，换一个就行
我就花20块在amazon上买了个capacitor自己换上，果然没问题了，这下把换opener那
300多刀省了，嗨嗨
找人来换了那两个spring，我们家是属于比较大的那种，spring 99一个，两个加
labor99总共300
报告完毕 |
|
s*****i
发帖数: 5548 | 27 ☆─────────────────────────────────────☆
jackahh (RockMyLife) 于 (Sat Aug 20 19:28:36 2011, 美东) 提到:
发信人: jackahh (RockMyLife), 信区: Living
标 题: 在线求救，空调坏了，楼上温度现在93度，哪里可以买电容
发信站: BBS 未名空间站 (Sat Aug 20 19:28:01 2011, 美东)
在线求救，空调坏了，室内楼上温度现在93度，楼下86度
查了一下，应该是电容的问题，去年刚换过，哪里可以周末买到电容
在德州
万谢
☆─────────────────────────────────────☆
iamadad (Simba) 于 (Sat Aug 20 23:16:14 2011, 美东) 提到:
radio shack. 很多电容有正负级，别弄错了
☆─────────────────────────────────────☆
superband (stl) 于 (Sun Aug 21 00:39:35 2011... 阅读全帖 |
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s****g
发帖数: 1028 | 28 If only 风扇 is having problem, most likely the capacitor is getting old.
Capacitor is used to start the fan motor, if it is getting old, the fan may
not start every time.
You can take the cover off and find the spec of the old one and buy an exact
same one and replace it.
Make sure it is the same size (same volt too).
Also please discharge the old one before remove it.
If you can not understand my instruction here, better hire some one to do it.
If you know what you doing, this is a 10 min job at... 阅读全帖 |
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g*****9
发帖数: 4125 | 29 If the capacitor is bad, the replacement is only $10-15 in retail (which you
can pick up same day locally).
If you know what to do, only take a few min to swap out. (maybe 30 min total
if you have to the take some cover metal off)
you can also try to use a chop stick to the fan blade to see if you can "
jump start" first, sometime this trick can work. fan don't need the
capacitor to run, just need it to start.
Good luck to you. |
|
d*i
发帖数: 9453 | 30 ☆─────────────────────────────────────☆
capacitor (电容) 于 (Wed Sep 19 14:39:55 2007) 提到:
20 min.不够也，怎么办？
☆─────────────────────────────────────☆
hillcrest (--) 于 (Wed Sep 19 14:40:48 2007) 提到:
slow down and take your time.
☆─────────────────────────────────────☆
capacitor (电容) 于 (Wed Sep 19 14:41:49 2007) 提到:
我是说健身房里只让用20分钟的cardio设备阿
偷偷加了几次，不知道是不是不太好啊
☆─────────────────────────────────────☆
dai (人生不外悲欢离合爱恨情仇) 于 (Wed Sep 19 14:42:59 2007) 提到:
是说在一个器械上不能超过20分钟，你作完了如果有人排队，
就换一个器 |
|
p***r
发帖数: 4859 | 31 在网上看到这个，305 烧主板可能和电池耗尽有关。
sportyguy's Full Review: Garmin Forerunner 205 1.5 in. Handheld GPS Receive.
..
Our Garmin Forerunner 205 has damaged two of our computer motherboards
after plugging it into a USB port. This has only happened when the
Forerunner was heavily used for a couple hours and needed to be
recharged. The first time it happened I thought it was my fault with
having just installed a new video card that needed higher power
requirements then what my computer had.
After replacing t... 阅读全帖 |
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g********0
发帖数: 6201 | 32 【 以下文字转载自 SanFrancisco 讨论区 】
发信人: Bacardi (白佳迪), 信区: SanFrancisco
标 题: 猥琐老硅工们好好向阿三女学学怎么吹牛逼吧
发信站: BBS 未名空间站 (Tue May 21 00:37:56 2013, 美东)
Indian-American teen invents 20-second charger
An 18-year-old Indian-American girl has invented a super-capacitor device
that could potentially charge your cellphone in less than 20 seconds.
Eesha Khare, from Saratoga, California, was awarded the Young Scientist
Award by the Intel Foundation after developing the tiny device that fits
inside mobile phone batte... 阅读全帖 |
|
z**h
发帖数: 382 | 33 【标题】：安规电容耐压值偏低，苹果iphone USB充电器存触电隐患
【声明】：链接中照片和电路来自Ken Shirriff的博客，一切版权归原著者所有
【引言】：
最近南航空姐马爱伦用充电中的iPhone4打电话触电身亡事件在网上炒得沸沸扬扬。部
分媒体将矛头指向港行售水货iPhone的廉价山寨充电器存安全隐患，可能导致电容击穿
将前级火线联通iPhone金属机壳导致触电。本文通过对原装正版iPhone充电器的剖析告
诉读者：即使是原装正版货，在中国大陆地区220V交流电条件下使用，同样存在电容击
穿导致触电的安全隐患。希望广大读者和有关部门引起充分重视，杜绝此类悲剧再次发
生。
何为安规电容？
百度百科词条：安规电容是指用于这样的场合，即电容器失效后，不会导致电击，不危
及人身安全。 它包括了X电容和Y电容。 x电容是跨接在电力线两线（L-N）之间的电容
，一般选用金属薄膜电容；Y电容是分别跨接在电力线两线和地之间（L-E，N-E）的电
容，一般是成对出现。基于漏电流的限制，Y电容值不能太大，一般X电容是uF级，Y电
容是nF级。X电容抑制差模干扰，Y电容抑制共模干扰。
市面上流... 阅读全帖 |
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a***4
发帖数: 236 | 35 有个note
4 Electrolytic capacitor aging. When used heavily or over an
extended period of time (1+ years) a PSU will slowly lose some of its
initial wattage capacity. We recommend you add 20% if you plan to keep your
PSU for more than 1 year, or 25-30% for 24/7 usage and 1+ years.
加上25% Capacitor Aging, 加100W |
|
发帖数: 1 | 36 Silicon Carbide: Smaller, Faster, Tougher
Meet the material that will supplant silicon in hybrid cars and the electric
grid
Illustration: Anatomy Blue
Some technological revolutions are flashy, and some are almost invisible. We
’re quite familiar with the flashy ones; they’ve given us powerful
computers we can hold in the palms of our hands, devices that can pinpoint
our locations by way of orbiting satellites, and the ability to bank and
shop without leaving our homes.
But none of these innovat... 阅读全帖 |
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f*****0
发帖数: 489 | 37
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. |
|
g******u
发帖数: 3060 | 38 I'm looking for a MOSFET gate driver chip (either half bridge, or individual
driver).
You know that for high side FET driver, nowadays people use the bootstrap
capacitor, when it's dischaged, the FET is turned on. There should be some
chip with on-chip charging circuitry, that keep the capacitor recharged all
the time, thus the MOSFET can be kept always on if needed. This feature is
very important in motor controllers since it delivers more power to the load
when necessary.
I found Linear Tech L |
|
s******e
发帖数: 2181 | 39 Thank you upstairs!
Can I increase the input capacitor to 22 uF so that the impedience for low
frequency attenuates? The original input capacitor was 1 uF. |
|
s******e
发帖数: 2181 | 40 Thank you upstairs!
Can I increase the input capacitor to 22 uF so that the impedience for low
frequency attenuates? The original input capacitor was 1 uF. |
|
s******e
发帖数: 2181 | 41 Thank you upstairs!
Can I increase the input capacitor to 22 uF so that the impedience for low
frequency attenuates? The original input capacitor was 1 uF. |
|
f*****0
发帖数: 489 | 42 you will never be able to find a high quality 22uf capacitor to do what you
wanted to do. electrolytic capacitors are surprisingly leaky and resistive.
your likely best solution is in the digital domain. |
|
r*****s
发帖数: 262 | 43 谢谢回答。
我的问题是
switched capacitor integrator需要settle到1/1000以内？
还是要settle到1/10000以内？或者更精确？
因为我已经给出了half clock cycle的时间长度--》50ns
如果需要settle到1/1000以内，tao=1/(2*pi*f)=50ns/7=7ns
f是integrator的GBW。所以就可以定出opamp的最小带宽
但是如果需要settle到1/10000以内，opamp的最小带宽就是另一个数值了
所以我实际上在问 16bit 3阶modulator的第一级switched capacitor integrator
需要settle到何等精确。
integrati
t
sho |
|
h********t
发帖数: 555 | 44 The leakage current could be non-linearly depending on the voltage across the capacitor. It could keep changing with time as the voltage across the capacitor changes with time due to leakage current. The leakage also changes dramatically when ambient temperature changes. If you want to calibrate it, you have to repeat this calibration process from time to time to take care such temperature drift effect. It is quite complicated. |
|
g*z
发帖数: 124 | 45 looks simple in theory, however, there's no such thing called ideal inductor
, ideal capacitor, you've got to simulate with real inductor/capacitors.
since you are designing a narrow band filter, you've got to have a inductor
with very large Q |
|
I***a
发帖数: 704 | 46 我这里做的所有数字芯片片内都没有de-coupling capacitor,
你的意思是后端设计的时候就要用encounter 的 adddecap命令加上？
数字芯片片内一定要有de-coupling capacitor吗？ 我这里上课做的芯片也没有加啊？ |
|
f***i
发帖数: 33 | 47 can I use another capacitor in parallel with the crystal to tune the
resonance frequency(pass frequency)?
I am wondering whether this will effect the quality factor of combined
filter(crystal filter+additional capacitor) or not?
thanks. |
|
t**********i
发帖数: 63 | 48 Fresh或者有经验的。有兴趣者站内信联系
Design and implement high speed analog/mixed-signal circuits in advanced
CMOS technology for integration in system-on-chip products:
- understand how circuits work
- develop and improve new and existing circuit solutions
- simulate circuits
- present and receive technical feedback at reviews
Design, model, document and communicate Analog IP to internal customers:
- create specs
- create circuit models
- define package and pc board requirements
Understand system level archit... 阅读全帖 |
|
t**********i
发帖数: 63 | 49 Fresh或者有经验的。有兴趣者请把简历发到t************[email protected]
Design and implement high speed analog/mixed-signal circuits in advanced
CMOS technology for integration in system-on-chip products:
- understand how circuits work
- develop and improve new and existing circuit solutions
- simulate circuits
- present and receive technical feedback at reviews
Design, model, document and communicate Analog IP to internal customers:
- create specs
- create circuit models
- define package and pc board requirements
Und... 阅读全帖 |
|
