焊个什么好? - 未名空间MITBBS历史存档

c*x2009-05-16 07:05

1 楼

中美之间有一个根本性的不同，中国单要达到一半就需要比美国多一倍的资源。这势必
会引发全球的抵触。
当然，美国也好党国也罢，真正操盘和得益的都只是顶部的精英阶层，但是没有本国民
众的支持和全力配合，霸权和利益都是水中月。美国鬼子的人口数量是美国的4倍多。
现阶段我们的人口压力已经显现，人口老龄化，产业转型造成的就业压力，生活水平提
高造成的生活压力等等。这就决定了我们需要比美国更多更大的利益诉求。
且不说我们达到美国人的生活水平，爱国精神和党国的兔子的爱国精神现在都是一流的
，但是如果生活水平没有随国力或者是人民付出增长而提升，那爱国主义和生产力的下
降是必然的，到时内部的矛盾就会让本国在争霸中落败。（比如阿三，人才流失严重，
多民族向心力极差，在大国中混得最惨）

h*e2009-05-16 07:05

2 楼

【以下文字转载自 RuralChina 讨论区】
发信人: hone (磨刀石), 信区: RuralChina
标题: 新舞曲来了(电视画面）
发信站: BBS 未名空间站 (Mon Apr 23 01:57:33 2012, 美东)
Dance Central 2;
Last night;
100% gold stars;
2428306
光膀子跳舞，形象不佳，所以没有录真人show
http://www.youtube.com/watch?v=YdiFcFcdj4E

K*N2009-05-16 07:05

3 楼

http://www.youtube.com/watch?v=c4b7S4b2VX0

R*s2009-05-16 07:05

4 楼

☆─────────────────────────────────────☆
JianlianYi (Air Yi) 于 (Mon Apr 18 15:25:18 2011, 美东) 提到:
最后一次贴
☆─────────────────────────────────────☆
walkingtall (步步高) 于 (Mon Apr 18 16:03:32 2011, 美东) 提到:
why?

☆─────────────────────────────────────☆
Raininglotus (小雨) 于 (Mon Apr 18 16:04:04 2011, 美东) 提到:
为什么呀?
☆─────────────────────────────────────☆
Patchouli (夏日薄荷) 于 (Mon Apr 18 16:54:22 2011, 美东) 提到:
失恋？
☆─────────────────────────────────────☆
doko (硬板床) 于 (Mon Apr 18 16:55:18 2011, 美东) 提到:
....不象
☆─────────────────────────────────────☆
Patchouli (夏日薄荷) 于 (Mon Apr 18 16:55:56 2011, 美东) 提到:
为嘛最后一首了？
☆─────────────────────────────────────☆
Patchouli (夏日薄荷) 于 (Mon Apr 18 16:56:31 2011, 美东) 提到:
不是失恋，那样子就很不好。。。
为嘛最后一首了？
☆─────────────────────────────────────☆
Patchouli (夏日薄荷) 于 (Mon Apr 18 17:01:02 2011, 美东) 提到:
这首歌很好听
☆─────────────────────────────────────☆
awaterlily (小水车) 于 (Mon Apr 18 17:40:16 2011, 美东) 提到:
连回帖都不屑了
桑心了。。。。。。
☆─────────────────────────────────────☆
JianlianYi (Air Yi) 于 (Mon Apr 18 18:15:25 2011, 美东) 提到:
肉条好几天没来了
我跟你一样哀怨
这个解释你看可以吗？
☆─────────────────────────────────────☆
awaterlily (小水车) 于 (Mon Apr 18 18:17:20 2011, 美东) 提到:
太敷衍了吧
不行！
对了，请教一下怎么合集啊？
☆─────────────────────────────────────☆
JianlianYi (Air Yi) 于 (Mon Apr 18 18:20:27 2011, 美东) 提到:
http://www.mitbbs.com/bbsann2/bbs.faq/board/reg/bbsguide/BBS%D6
☆─────────────────────────────────────☆
awaterlily (小水车) 于 (Mon Apr 18 18:21:57 2011, 美东) 提到:
真贴心
以后我MARK你
好伐
☆─────────────────────────────────────☆
JianlianYi (Air Yi) 于 (Mon Apr 18 18:23:09 2011, 美东) 提到:
弗好
你奔个给我瞅瞅好了
☆─────────────────────────────────────☆
awaterlily (小水车) 于 (Mon Apr 18 18:26:57 2011, 美东) 提到:
弗好
你教的实践不行
其实我合集过的
可是我忘了
唉
小帅在就好了
☆─────────────────────────────────────☆
Patchouli (夏日薄荷) 于 (Mon Apr 18 18:51:26 2011, 美东) 提到:
赞！
http://www.mitbbs.com/bbsann2/bbs.faq/board/reg/bbsguide/BBS%D6
☆─────────────────────────────────────☆
Patchouli (夏日薄荷) 于 (Mon Apr 18 18:52:12 2011, 美东) 提到:
b, 进去就看到选项了
☆─────────────────────────────────────☆
Drkiller (帅帅) 于 (Mon Apr 18 22:35:12 2011, 美东) 提到:
他准备自己唱了

A*s2009-05-16 07:05

5 楼

【以下文字转载自 FantaSoccer 讨论区】
发信人: wxiao (天盖高而无阶), 信区: FantaSoccer
标题: 摘自天涯社区八卦江湖
发信站: BBS 未名空间站 (Mon Dec 1 18:07:40 2008), 站内
发信人: attar (万里无云万里天), 信区: SanFrancisco
标题: 摘自天涯社区八卦江湖
发信站: BBS 未名空间站 (Mon Dec 1 17:49:23 2008)
摘自天涯社区八卦江湖, 是否也勾起了众人痛苦的回忆？
1、现有甲、乙、丙三个水管，甲水管以每秒4克的流量流出含盐20％的盐水，乙水管以
每秒6克的流量流出含盐15％的盐水，丙水管以每秒10克的流量流出水，丙管打开后开
始2秒不流，接着流5秒，然后又停2秒，再流5秒……三管同时打开，1分钟后都关上，
这时流出的混合液含盐百分之几？
MLGBD，这水管丙尿路感染了吧
2、看到数学都恶心啊，还好高考的时候让我几个了，大学的专业没有学高数了。。。
。高三那时候就数学脱我后腿，想死的心不止一次啊，遗书都写一半了- -
3、在一个神话故事中，

d*i2009-05-16 07:05

6 楼

来讨论点新技术LI-FI
通过头顶的LED建立网络。
两个问题：
一般的LED能达到需要的闪烁频率吗
怎么实现双向通信？也就是从手机／电脑到AP的通信？

s*y2009-05-16 07:05

7 楼

新买的笔记本装了Windows10，实在用不惯，想重装回Win7，用什么安装包比较好？
用类似深度、番茄花园这种破解版的？还是先下载正版，再下key呢？网上的key能用吗
？

c*42009-05-16 07:05

8 楼

RT
这个项目如何，就业怎么样呢，希望对这个学校有了解的人都可以分享一下对这个学校
的认识和评价，先谢谢大家啦！

a*g2009-05-16 07:05

9 楼

The 21st century learning skills are often called the 4 C's: critical
thinking, creative thinking, communicating, and collaborating. These skills
help students learn, and so they are vital to success in school and beyond.
See videos of each main area below at the website - https://k12.
thoughtfullearning.com/FAQ/what-are-learning-skills
Critical Thinking
Critical thinking is focused, careful analysis of something to better
understand it. When people speak of "left brain" activity, they are usually
referring to critical thinking. Here are some of the main critical-thinking
abilities:
* Analyzing is breaking something down into its parts, examining each part,
and noting how the parts fit together.
* Arguing is using a series of statements connected logically together,
backed by evidence, to reach a conclusion.
* Classifying is identifying the types or groups of something, showing how
each category is distinct from the others.
* Comparing and contrasting is pointing out the similarities and
differences between two or more subjects.
* Defining is explaining the meaning of a term using denotation,
connotation, example, etymology, synonyms, and antonyms.
* Describing is explaining the traits of something, such as size, shape,
weight, color, use, origin, value, condition, location, and so on.
* Evaluating is deciding on the worth of something by comparing it against
an accepted standard of value.
* Explaining is telling what something is or how it works so that others
can understand it.
* Problem solving is analyzing the causes and effects of a problem and
finding a way to stop the causes or the effects.
* Tracking cause and effect is determining why something is happening and
what results from it.
Creative Thinking
Creative thinking is expansive, open-ended invention and discovery of
possibilities. When people speak of "right brain" activity, they most often
mean creative thinking. Here are some of the more common creative thinking
abilities:
* Brainstorming ideas involves asking a question and rapidly listing all
answers, even those that are far-fetched, impractical, or impossible.
* Creating something requires forming it by combining materials, perhaps
according to a plan or perhaps based on the impulse of the moment.
* Designing something means finding the conjunction between form and
function and shaping materials for a specific purpose.
* Entertaining others involves telling stories, making jokes, singing songs
, playing games, acting out parts, and making conversation.
* Imagining ideas involves reaching into the unknown and impossible,
perhaps idly or with great focus, as Einstein did with his thought
experiments.
* Improvising a solution involves using something in a novel way to solve a
problem.
* Innovating is creating something that hasn't existed before, whether an
object, a procedure, or an idea.
* Overturning something means flipping it to get a new perspective, perhaps
by redefining givens, reversing cause and effect, or looking at something
in a brand new way.
* Problem solving requires using many of the creative abilities listed here
to figure out possible solutions and putting one or more of them into
action.
* Questioning actively reaches into what is unknown to make it known,
seeking information or a new way to do something.
Communicating
* Analyzing the situation means thinking about the subject, purpose, sender
, receiver, medium, and context of a message.
* Choosing a medium involves deciding the most appropriate way to deliver a
message, ranging from a face-to-face chat to a 400-page report.
* Evaluating messages means deciding whether they are correct, complete,
reliable, authoritative, and up-to-date.
* Following conventions means communicating using the expected norms for
the medium chosen.
* Listening actively requires carefully paying attention, taking notes,
asking questions, and otherwise engaging in the ideas being communicated.
* Reading is decoding written words and images in order to understand what
their originator is trying to communicate.
* Speaking involves using spoken words, tone of voice, body language,
gestures, facial expressions, and visual aids in order to convey ideas.
* Turn taking means effectively switching from receiving ideas to providing
ideas, back and forth between those in the communication situation.
* Using technology requires understanding the abilities and limitations of
any technological communication, from phone calls to e-mails to instant
messages.
* Writing involves encoding messages into words, sentences, and paragraphs
for the purpose of communicating to a person who is removed by distance,
time, or both.
Collaborating
* Allocating resources and responsibilities ensures that all members of a
team can work optimally.
* Brainstorming ideas in a group involves rapidly suggesting and writing
down ideas without pausing to critique them.
* Decision-making requires sorting through the many options provided to the
group and arriving at a single option to move forward.
* Delegating means assigning duties to members of the group and expecting
them to fulfill their parts of the task.
* Evaluating the products, processes, and members of the group provides a
clear sense of what is working well and what improvements could be made.
* Goal setting requires the group to analyze the situation, decide what
outcome is desired, and clearly state an achievable objective.
* Leading a group means creating an environment in which all members can
contribute according to their abilities.
* Managing time involves matching up a list of tasks to a schedule and
tracking the progress toward goals.
* Resolving conflicts occurs from using one of the following strategies:
asserting, cooperating, compromising, competing, or deferring.
* Team building means cooperatively working over time to achieve a common
goal.
*********************************************
--

n*a2009-05-16 07:05

10 楼

焊个什么好? 学期结束了, 剩下一些实验元件, 有一些三极管, 二极管, 放大器什么的
. 想焊个什么东东, 留作纪念, 想不出弄个什么好. 大侠给个建议可以吗? 电阻和线路
板已经买了.

d*i2009-05-16 07:05

11 楼

这个话题在笑话版讨论的热火朝天，这里却没人接话，什么原理？

【在 d****i 的大作中提到】

: 来讨论点新技术LI-FI
: 通过头顶的LED建立网络。
: 两个问题：
: 一般的LED能达到需要的闪烁频率吗
: 怎么实现双向通信？也就是从手机／电脑到AP的通信？

k*02009-05-16 07:05

12 楼

去 mydigitallife forum 下，然后装loader.

c*42009-05-16 07:05

13 楼

没有人了解这个学校的这个专业吗，期待中。。。

a*g2009-05-16 07:05

14 楼

The 21st century learning skills are often called the 4 C's: critical
thinking, creative thinking, communicating, and collaborating. These skills
help students learn, and so they are vital to success in school and beyond.
See videos of each main area below at the website - https://k12.
thoughtfullearning.com/FAQ/what-are-learning-skills
Critical Thinking
Critical thinking is focused, careful analysis of something to better
understand it. When people speak of "left brain" activity, they are usually
referring to critical thinking. Here are some of the main critical-thinking
abilities:
* Analyzing is breaking something down into its parts, examining each part,
and noting how the parts fit together.
* Arguing is using a series of statements connected logically together,
backed by evidence, to reach a conclusion.
* Classifying is identifying the types or groups of something, showing how
each category is distinct from the others.
* Comparing and contrasting is pointing out the similarities and
differences between two or more subjects.
* Defining is explaining the meaning of a term using denotation,
connotation, example, etymology, synonyms, and antonyms.
* Describing is explaining the traits of something, such as size, shape,
weight, color, use, origin, value, condition, location, and so on.
* Evaluating is deciding on the worth of something by comparing it against
an accepted standard of value.
* Explaining is telling what something is or how it works so that others
can understand it.
* Problem solving is analyzing the causes and effects of a problem and
finding a way to stop the causes or the effects.
* Tracking cause and effect is determining why something is happening and
what results from it.
Creative Thinking
Creative thinking is expansive, open-ended invention and discovery of
possibilities. When people speak of "right brain" activity, they most often
mean creative thinking. Here are some of the more common creative thinking
abilities:
* Brainstorming ideas involves asking a question and rapidly listing all
answers, even those that are far-fetched, impractical, or impossible.
* Creating something requires forming it by combining materials, perhaps
according to a plan or perhaps based on the impulse of the moment.
* Designing something means finding the conjunction between form and
function and shaping materials for a specific purpose.
* Entertaining others involves telling stories, making jokes, singing songs
, playing games, acting out parts, and making conversation.
* Imagining ideas involves reaching into the unknown and impossible,
perhaps idly or with great focus, as Einstein did with his thought
experiments.
* Improvising a solution involves using something in a novel way to solve a
problem.
* Innovating is creating something that hasn't existed before, whether an
object, a procedure, or an idea.
* Overturning something means flipping it to get a new perspective, perhaps
by redefining givens, reversing cause and effect, or looking at something
in a brand new way.
* Problem solving requires using many of the creative abilities listed here
to figure out possible solutions and putting one or more of them into
action.
* Questioning actively reaches into what is unknown to make it known,
seeking information or a new way to do something.
Communicating
* Analyzing the situation means thinking about the subject, purpose, sender
, receiver, medium, and context of a message.
* Choosing a medium involves deciding the most appropriate way to deliver a
message, ranging from a face-to-face chat to a 400-page report.
* Evaluating messages means deciding whether they are correct, complete,
reliable, authoritative, and up-to-date.
* Following conventions means communicating using the expected norms for
the medium chosen.
* Listening actively requires carefully paying attention, taking notes,
asking questions, and otherwise engaging in the ideas being communicated.
* Reading is decoding written words and images in order to understand what
their originator is trying to communicate.
* Speaking involves using spoken words, tone of voice, body language,
gestures, facial expressions, and visual aids in order to convey ideas.
* Turn taking means effectively switching from receiving ideas to providing
ideas, back and forth between those in the communication situation.
* Using technology requires understanding the abilities and limitations of
any technological communication, from phone calls to e-mails to instant
messages.
* Writing involves encoding messages into words, sentences, and paragraphs
for the purpose of communicating to a person who is removed by distance,
time, or both.
Collaborating
* Allocating resources and responsibilities ensures that all members of a
team can work optimally.
* Brainstorming ideas in a group involves rapidly suggesting and writing
down ideas without pausing to critique them.
* Decision-making requires sorting through the many options provided to the
group and arriving at a single option to move forward.
* Delegating means assigning duties to members of the group and expecting
them to fulfill their parts of the task.
* Evaluating the products, processes, and members of the group provides a
clear sense of what is working well and what improvements could be made.
* Goal setting requires the group to analyze the situation, decide what
outcome is desired, and clearly state an achievable objective.
* Leading a group means creating an environment in which all members can
contribute according to their abilities.
* Managing time involves matching up a list of tasks to a schedule and
tracking the progress toward goals.
* Resolving conflicts occurs from using one of the following strategies:
asserting, cooperating, compromising, competing, or deferring.
* Team building means cooperatively working over time to achieve a common
goal.
*********************************************
--

S*e2009-05-16 07:05

15 楼

六管收音机

【在 n********a 的大作中提到】

: 焊个什么好? 学期结束了, 剩下一些实验元件, 有一些三极管, 二极管, 放大器什么的
: . 想焊个什么东东, 留作纪念, 想不出弄个什么好. 大侠给个建议可以吗? 电阻和线路
: 板已经买了.

v*n2009-05-16 07:05

16 楼

因为它就是一个笑话？这种话题把TED这类的活动的reputation都给搞下去了。。。。

【在 d****i 的大作中提到】

: 这个话题在笑话版讨论的热火朝天，这里却没人接话，什么原理？

d*o2009-05-16 07:05

17 楼

收音机啊，多经典，呵呵

【在 n********a 的大作中提到】

: 焊个什么好? 学期结束了, 剩下一些实验元件, 有一些三极管, 二极管, 放大器什么的
: . 想焊个什么东东, 留作纪念, 想不出弄个什么好. 大侠给个建议可以吗? 电阻和线路
: 板已经买了.

S*e2009-05-16 07:05

18 楼

re
中学的时候焊过，呵呵

【在 d****o 的大作中提到】

: 收音机啊，多经典，呵呵

d*o2009-05-16 07:05

19 楼

焊个电源也好，嘻嘻

【在 S********e 的大作中提到】

: re
: 中学的时候焊过，呵呵

f*02009-05-16 07:05

20 楼

it depends on what devices you have. it is fairly difficult to get a
real radio out of transistors.
But it is quite easy to get a pre amplifier or a headphone amp - they
don't need to deliver a lot of power and small signal or medium power
transistors will do.

【在 n********a 的大作中提到】

: 焊个什么好? 学期结束了, 剩下一些实验元件, 有一些三极管, 二极管, 放大器什么的
: . 想焊个什么东东, 留作纪念, 想不出弄个什么好. 大侠给个建议可以吗? 电阻和线路
: 板已经买了.

n*a2009-05-16 07:05

21 楼

我有2N2222: 3pcs, 2N3904: 5pcs, 2N3906: 4pcs, 2N4001: 1pcs, 2N3820, 3pcs,
CD4007: 4 pcs, Diode: 9pcs, Zener diode: 1pcs, LM741: 3pcs, LF356N: 1pcs.
收音机到处都是, 车里, MP3, 手机里, 多弄一个没有什么实用价值. 最好弄一个有些
实用价值的.

f*02009-05-16 07:05

22 楼

you cannot do a whole lot with 741: they are junk for the most part. LF356
is a decent opamp but you only have one piece.
I never heard of 2n4001 (you sure it is not 1n4001?), nor 2n3820. cd4007 is
cmos and no good for audio.
2n2222, 3904 and 3906 are good general purposes small signal transistors,
and 3904/3906 are a good pnp/npn pair.
so you can use them for a pre amp. or if you want, you can use them to build
a diamond buffer to drive your headphone - better with high impedance
headphone beca

d*n2009-05-16 07:05

23 楼

usb charger, from car 12V to usb

【在 n********a 的大作中提到】

: 我有2N2222: 3pcs, 2N3904: 5pcs, 2N3906: 4pcs, 2N4001: 1pcs, 2N3820, 3pcs,
: CD4007: 4 pcs, Diode: 9pcs, Zener diode: 1pcs, LM741: 3pcs, LF356N: 1pcs.
: 收音机到处都是, 车里, MP3, 手机里, 多弄一个没有什么实用价值. 最好弄一个有些
: 实用价值的.

f*02009-05-16 07:05

24 楼

those transistors have (near) zero current capability so they aren't
going to work in a switching mode power supply;
in a linear power supply, their limited power dissipation means the "usb
charger" will have very limited ability to power anything.

【在 d**n 的大作中提到】

: usb charger, from car 12V to usb

d*n2009-05-16 07:05

25 楼

专家
偶看不懂
要不天线放大器？现在都digital 了，要是里电视塔远的话，会有很多马赛克，要是
可以做个boost 信号的，不错

【在 f*****0 的大作中提到】

:
: those transistors have (near) zero current capability so they aren't
: going to work in a switching mode power supply;
: in a linear power supply, their limited power dissipation means the "usb
: charger" will have very limited ability to power anything.

f*02009-05-16 07:05

26 楼

those transistors have ft around 200 - 300mhz. they are at best good for
IF amplification and you will need true RF transistors to amplify OTA
signals.
pretty much all OTA receivers have AGC and you don't really need a
booster unless the receiver really sucks.

【在 d**n 的大作中提到】

: 专家
: 偶看不懂
: 要不天线放大器？现在都digital 了，要是里电视塔远的话，会有很多马赛克，要是
: 可以做个boost 信号的，不错

n*a2009-05-16 07:05

27 楼

谢谢! FKU0000 说的不错, 看来是大牛, 我到是有一对没有功放的喇叭, 也许可以弄一
个电脑音响, 嘿嘿.

f*02009-05-16 07:05

28 楼

you will be unlikely to be able to get enough power from those
transistors to power a real set of speakers. I would venture to say that
you can maybe 100 - 200mw max out of those transistors. that's good for
headphones but not speakers.

【在 n********a 的大作中提到】

: 谢谢! FKU0000 说的不错, 看来是大牛, 我到是有一对没有功放的喇叭, 也许可以弄一
: 个电脑音响, 嘿嘿.

n*a2009-05-16 07:05

29 楼

可是耳机的声音已经够大了, 你的意思是不是做一个tune controller 或equalizer?

f*02009-05-16 07:05

30 楼

not sure what a tune controller is but yeah, you can build an equalizer
but it wouldn't be "hi-fi" anymore.

【在 n********a 的大作中提到】

: 可是耳机的声音已经够大了, 你的意思是不是做一个tune controller 或equalizer?

c*l2009-05-16 07:05

31 楼

凡是有回路的，你都很难短时间内凭经验给调好了
不如如大家所说，焊个功放接个音箱玩吧

【在 n********a 的大作中提到】

: 焊个什么好? 学期结束了, 剩下一些实验元件, 有一些三极管, 二极管, 放大器什么的
: . 想焊个什么东东, 留作纪念, 想不出弄个什么好. 大侠给个建议可以吗? 电阻和线路
: 板已经买了.

c*n2009-05-16 07:05

32 楼

假如你是音乐爱好者，可以考虑做一个专业的数字播放器，

【在 n********a 的大作中提到】

: 我有2N2222: 3pcs, 2N3904: 5pcs, 2N3906: 4pcs, 2N4001: 1pcs, 2N3820, 3pcs,
: CD4007: 4 pcs, Diode: 9pcs, Zener diode: 1pcs, LM741: 3pcs, LF356N: 1pcs.
: 收音机到处都是, 车里, MP3, 手机里, 多弄一个没有什么实用价值. 最好弄一个有些
: 实用价值的.