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电磁炮
这个线圈炮啊,是个历史悠久的东西。第一代电磁炮就是线圈炮。不过这玩意效率很低,存在加速极限,so,磁阻加速在高端领域一直属于可有可无的玩意 蛋似,对于刚刚入门的小白来说,磁阻是所有电磁炮中原理最简单,加工难度最小的。而科创也不乏一些大神把磁阻玩到出神入化的程度,这也说明了磁阻在人民群众中还是很有生命力的。 由于磁阻的特殊性质(弹丸悬浮)和较低的加速效率,磁阻炮几乎不可能加装膛和谐线来令弹丸自旋,这...
一体化等离子扬声器,稳定可靠
osfg
9年8个月前
发表于
高电压技术
动手实践: 实验报导
几个月前做过一个等离子扬声器,当时只是实验原理,很乱。这次想到要做几个成品,就把它拼起来了,加了个盒子,体积也缩小很多。另外加了一个风扇,连续工作10分钟散热器也只是微热,大概60°C这个样子。唯一不足估计就是我加长了GS控制线,增加了GS电容,这次没来得及用示波器测,实际感觉不到影响。 试验机在这 XXXXXXXXXXXXXXXXXXXXXXXX/t/70190 总览(工作状态) ...
ZVS驱动的小台灯1.2A 12V很亮工作稳定(分享不暴灯管的方法)
xiangbinzh
12年11个月前
回复于
高电压技术
内容:电流稳定1.2A。,发些测试照片:电压在9V------15V的工作电流基本不变工作
稳定。
关于配合物稳定常数的一个问题
全变
13年0个月前
发表于
化学
根据无机化学武大第二版,溴离子和银离子的lgβ1=4.38这种一元配合物可以理解为AgBr吗?但AgBr的溶度积常数=5.0×10^-13
【参赛】高真空环境下制备的碘单质稳定大晶体
Weskerpan
4年4个月前
发表于
晶体养成所
化学
动手实践: 实验报导
众所周知,碘单质具有挥发性,本文中在特殊的玻璃装置中制备碘单质晶体,具有长期可保存性(还是会产生略微变化但还是大晶体hhh)。 不受规定中易升华限制,特此说明。理论准备:不少人可能都见过常压下加热升华制备的片装碘晶体,但其结构松散,不耐运输,规整性一般。本作品中通过降低气压,使得碘在常温下加速升华,速度适中,可以在有限时间内观察到晶体生成,但慢于常压加热升华,避免产生片状晶体。另一方面,使用改进的...
发一个自己的设计 自旋稳定火箭
kight11
13年10个月前
发表于
喷气推进
这个设计模仿国产107火箭弹,没有经过任何计算,纯粹凭感觉乱画,是solidedge练手用的.发动机设想采用45号刚制造,尾部有6个偏转6度的喷管,用以推进以及驱动箭体自旋.圆形内孔药柱,燃面采用端面+内孔的方式.至于为什么,经简单的计算证明,在发动机壳体足够耐热的情况下,.端面+内孔的燃烧方式可以保证药柱衡面燃烧,前提是药柱的尺寸是经过计算并且细心加工过的.点火方式采用了和炮弹类似的点火管.发动...
搭了个555的推高压包,出弧咋振不稳定?
试卡。。
13年6个月前
发表于
高电压技术
此乃电路,我在5角与1角间加了个0.1uf的电容,那俩电阻均为11kΩ,管子被我换成了irfp250,高压包初级上了25圈,发现555总是死没办法又给了它个1k的电阻。之后给了它18伏电压,出弧相当低,必须摸两下那个场管散热片这高压包才肯出弧,这是什么原因?
单管ZVS终于能稳定拉弧了(仿电磁炉原理)
frival
11年10个月前
发表于
高电压技术
先贴个原理图,完全参考市场上的单管电磁炉的谐振部分,用了两个比较器,刚好一个LM393就搞定了; 因为比较器通过谐振波形来获得同步信号来控制开关管的,所以开始的一瞬间是需要一个启动信号来激发的,另外停振是不能恢复的,所以仿真中我加了一个信号源,必要的时候可以切换为他激方式;实际中如果反馈电路参数取值合理的话,也是不容易停振的。 这是焊好的小板 上电后测试波形,分别是MOS管漏极电压和控制电压,...
发两张手头的资料,谈模型火箭的稳定性
小馍馍胡落落
13年10个月前
发表于
喷气推进
首先,额.....这个是我的处女帖,这篇文章是王铮老师于03年写的,写的很翔实,王铮老师和稳鸢老师是国内专业模型火箭的先驱,有着多年的经验,相信这篇文章能揭开大家心中的一些迷惑,不像某些学术文章一大堆理论要全看明白需要很多年。
主板上哪个地方可以取得稳定的基准电压?
dctyu
14年2个月前
发表于
电子技术
精度必须在千分之一。有两个地方得到两个不同的值更好。我校表用。
验证乙烷交叉式构象更为稳定的原因——ETS-NOCV方法的实现
St_Maxwell
7年9个月前
发表于
化学
内容:但仅计算了重叠式的乙烷(最稳定嘛),没有计算重叠式结构的。
准备用阻容降压做个小夜灯,可是听说不稳定
铁头Sagiri
9年10个月前
发表于
电子技术
是真的么?还有其他降压方法么
实用多角度可调-3D打印手机支架-及其稳定性分析~对于疫情期间的居家学习十分有好处
忆昔长别
4年10个月前
发表于
极客DIY
物理
内容:即使打印的底部不那么平坦,依然可以保证放置的
稳定。
,(5) 当手机架不稳定时,增加手机架底座左侧伸出的长度$d_1$,增大底座的重量$G_2$可以有效提高手机摆放的稳定性。,这个也和生活经验一致,即底盘越大越沉,就越
稳定。
,4.后期改进目前发现,如果手机立着放,就不满足稳定性条件,摆放的角度一大就很容易向后翻倒。
ZVS终于搞定工作稳定(电容大点,是不是电流就大)
xiangbinzh
13年2个月前
发表于
高电压技术
把原件都焊下来,装的了洞洞板上了,上电试了几次,没有问题。电容确实是小,并了个电容,电流翻倍,电弧变粗了。看来还要弄个大容量的电容。
请教:测量脉冲高压的电压与测量稳定高压有何不同?
虎哥
14年7个月前
发表于
高电压技术
今天老朽采用2000:1高压分压器测量电警棍的电压。电警棍输出一端接分压器顶部均压环,另一端接分压器地端(均采用普通导线连接)。分压器抽头与地接入示波器观看。示波器输入阻抗1兆欧。分压器输入直流电阻为1000兆欧,输入电容30pF。分压器输出直流电阻为0.6兆欧左右,输出端电容约70nF(包括输出同轴电缆的电容)。电压表额定内阻为1兆欧,与示波器相同。静态试验,接10千伏电源,分压输出正常,仪器经...
555电路记的是可做1000W的.但555没494 SG3525稳定倒是真的.
west_0830
15年3个月前
回复于
电磁炮
引用第8楼yfxzhl于2009-10-16 19:18发表的 :555+场效应管,功率好像很难做太大,TL494倒是很轻松,效率高,功率大555点100W灯泡没问题.是一只场管哦.只是不能点太久会烧场管的.
天眼热成像,天眼4H吊舱,机载陀螺稳定多传感器光电观测系统
改装pcp
7年10个月前
发表于
跳蚤市场
下了大价钱搞了这个东西回来,一看原价是2800000元,有点精神来了,果断拿下。。完整一套,刚过了规定的使用年限7年,看标签。国有企业用的东西,就是牛,不管你多贵,是规定用多久就只用多久,不会超龄使用,280万的东西说下岗就下岗。刚查了下,资料不多,谁有这个的资料呢?想玩转起来。
飞机的性能、稳定性、动力学与控制(第二版) 班度·N·帕玛迪 航空工业出版社
氵鸽
1年5个月前
文件:暂无简介
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发个角速度传感器的测试报告,里面有最为重要的零偏稳定性和重复性
xuetianwuran
13年5个月前
发表于
喷气推进
型号:ADXL150,qq1487494416,欢迎交流
新手求助,看了三天越看越晕,求一个稳定的单级炮需要的元件型号和电路流程
雪月潇湘
12年3个月前
发表于
电磁炮
对电磁炮特别感兴趣,好科幻的说,但是看了三天越看越晕,光是电容有用450v2000uf的,还有500v220u的,还有几点起保护模块神马的,真心看不懂,分不太清什么是多级炮要用的,什么是单级炮要用的,希望老鸟多帮助帮助新手入门,这三天我所有的帖子都看过了,讨论帖和展示贴较多,科教贴太少呀,你们讨论的是挺NB,大部分我也都能理解,但新手真心不知道怎么这些NB的套件组装起来呀,求一个单级炮的元件型号清...
ANPU火箭燃料及其成品发动机
哲元
6年5个月前
发表于
航空航天
科创基金
内容:制造一种AN基,以AN-镁-PU为主要成分的火箭燃料,并且装机得到稳定的成品发动机。
横河机电2793型精密电阻箱
虎哥
10年0个月前
回复于
仪器仪表
拆机鉴赏
内容:高阻型号,开关接触电阻不稳定,大的时候有3欧。,拿滤纸插干净以后大约0.1欧,但还是不
稳定。
,低阻型号的开关倒是很
稳定。
发一个典型的国产瞄准式无线电干扰机的内部照片
1211
19年2个月前
回复于
电子技术
无线电
拆机鉴赏
内容:该机性能总的来说相当稳定,在国产货中是比较好的。
【水】【KC资助】SORT 射电望远镜控制部分的研发
墨镜哈哈日记
5年8个月前
回复于
极客DIY
天文与空间科学
内容:我感觉花生壳的东西稳定性欠佳,路由器绑了花生壳普通专业版的穿透,还没免费的ngrok来的稳定,up能力可以的话,可以买个便宜服务器开ngrok
经典数字万用表HP3456A拆解高清多图 by TAAT
WJXHH007
1年11个月前
回复于
仪器仪表
拆机鉴赏
内容:用同一个源,还有一台刚校准的爱德万6871七位半做比较,3456可稳定多了。,不止是短稳,我连续测了半个月左右3456在两个小时预热后达到稳定后的实测电压值,几乎没有变化。
测了几个手头的恒温晶振
miles
9年2个月前
发表于
仪器仪表
内容:第一张的是稳定度,看来MV系列的晶振编号越大稳定度越好 第二张的是相噪,基本没有什么参考价值,因为测量的参考是氢钟,原子钟的相噪一般般,这个曲线基本就是原子钟的 不过稳定度还是有比较大的差别
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