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核技术与核仪器
动手实践: 实验报导
电路如上图,受这篇(Radioaktivität (XXXXXXXXXXXXXXXXXXX)(链接不准确,该网站中有一份达林顿的,但找不着了)文章启发,使用了达林顿式结构。连JFET都没有用,整体BOM成本小于3块钱(国产BPW34大约1.3RMB,型号为PD70-01C)(不包括电池和示波器)。效果如下,9V层叠电池供电,PIN紧贴低活度源,EMI屏蔽与前文类似。接下来会试试文章中JFET的版...
低成本
物联网网关方案
大仙
5个月8天前
专栏文章
拆机大全
内容:最近用海思方案的机顶盒来做物联网采集网关。参考资料。XXXXXXXXXXXXXXXXXX/Krzysztow/modbus-utilsXXXXXXXXXXXXXXXXXX/epsilonrt/mbpollXXXXXXXXXXXXXXXXXX/3cky/mbusdXXXXXXXXXXXXXXXXXX/ganehag/open-modbusgateway
探寻
低成本
LM399电压基准的最佳电路
炭达人
2年2个月前
发表于
仪器仪表
电子技术
动手实践: 实验报导,严肃内容: 专业科普
内容:我打算制作一个LM399的10V基准,目标有四个- 尽可能高的长期稳定性(15ppm/年)-
低成本
- 准确的10.00000V输出- 电阻和运放等器件易于购买,且货源有保障和大家探讨一下电路设计的细节
低成本
手搓一台球磨机
WEIZILI
4个月4天前
发表于
机械与工具
动手实践: 实验报导
由于我实在懒得手动研磨了,所以我送我的大研钵去吃灰了,买了个研磨机(刀片的),然后发现,它不是很好使,所以我又请回了我的大研钵可它也不怎么好用于是我决定搞台球磨机但是这玩意价格实在不怎么美丽,珠宝抛光机那个塑料桶我总感觉不太结实,并且哪天我研磨个活泼金属之类的,静电积累打个电火花给我炸死了怎么办,于是我打算手搓一个自攻丝,用于固定轴承座立式轴承座,用于固定光轴一块大木板子,用作底座套在光轴上,增加...
能提供
低成本
风电的新型风力机
1211
17年11个月前
发表于
电气电工
内容:能提供
低成本
风电的新型风力机《石油与能源动力》提要:第一代商用扩散体增强型风力机(DAWT)在新西兰刚开始两年试运行,如果开发者的预期结果得以实现,这种新设计的风力机可促使风电成本大幅度降低。,扩散体经济性的关键在于以最
低成本
获得最大的尺寸。
试制
低成本
光电PIN探测器
GiroPetrenko
3年1个月前
发表于
核技术与核仪器
动手实践: 实验报导
做点简单的放松一下。。。PCB。外形很小,只有8*40mm,可以塞进一支圆珠笔内。总共设计了4个pin的位置,实际上只用了一个。成本大头在PIN上,现在使用的是TEMD5080,大约是8RMB一只。换成BPW34大概5RMB,若是还要省,可以使用国产的BPW34,整体成本控制在10RMB以下。电路图,与CERN的DIY探测器一样。1pF的C0G电容和100M的电阻都是1206的,占空间稍微大些。实...
发一个
低成本
diy台钳架
kkdren
10年5个月前
发表于
极客DIY
工欲善其事必先利其器,diy一个台钳架兼小型工作台: 台面是废品收购站买的12毫米厚钢板(薄一点的更好5mm的足够了,只是废品收购站没找到合适的),70多斤 支架用的货架角铁2mm厚,高60公分,由于角铁是铁质的不宜做的太高并适当加几个支撑在台面和底部(侧面加点更好),35kg的台面加5kg的台钳,加70kg的人站在上面依然很牢固。 总花费钢板80元,角铁40元,性价比不错。
超
低成本
YAG激光器,锯条打孔
fleefly
1年7个月前
发表于
强激光
看到一支非常便宜的纹眉机手柄机芯,还带红瞄,于是买回来清洗调整,聚焦后两下可以洞穿钢锯条。下面是原理图。储能用电解电容4S2P,工作电压1000V容量100u,共50J.触发用0.33u 1200V的电磁炉电容,1000V气体放电管触发。触发线圈绕在8mm磁棒上,次级用1mm漆包线,60匝,初级8根0.51mm并联 ,3匝。手柄机芯和闪光灯电容。谐振腔里面都是水垢,用柠檬酸泡了大半天,再用纯净水洗...
低成本
业余制备发烟硝酸
过氧化氢异丙苯
9个月16天前
发表于
化学
动手实践: 实验报导
以上图片为搭建完毕的实验装置的局部图(各种管路盘根错节,看着头皮发麻)本次实验通过浓硫酸与硝酸钾生成硫酸氢钾与硝酸的反应,并将硝酸蒸馏出反应体系,以达到制备发烟硝酸的目的原料为K K鲨鱼(90%以上浓硫酸)以及天脊农用硝酸钾(自己又重结晶提纯了一遍)2024年2月8日,在家整了个制备发烟硝酸最终产物大概有50毫升,产率约93%,以下为产物图片接下来描述一下具体的过程首先是称量约112·3克的硝酸...
求助:N2O5的
低成本
合成方法
博丽灵梦
12年5个月前
发表于
化学
我原先曾经试制了少量ADN,是用无机法制作的,结果相当麻烦,见下:1.硝硫混酸在-40°C的条件下硝化氨基磺酸铵,生成ADN;2.活性炭吸附ADN,再在甲苯中解吸,生成粗品;3.进一步精制,得成品,产率为15%结果第二天直至第N天下雨,ADN潮解了。。。。。只留下做小规模燃烧实验的图片。。。。于是,我决定采用有机法合成,即氨基甲酸乙酯-N2O5法,此法步骤较少,产率可达40%以上,成品纯度高。但是...
自制
低成本
α粒子探测器(α粒子能谱)
TubeChip404
2年8个月前
发表于
核技术与核仪器
动手实践: 实验报导
内容:也可能是多道没有做基线恢复导致的(因为脉冲信号有过冲和堆叠),而且在专业的α粒子能谱测量过程中,除使用金硅面垒型探测器以外,还要将探测室抽成真空,这样才能降低α粒子在空气中因与空气分子碰撞而产生散射的能量降低,但这作为一个
低成本
的探测器
低成本
D阳光房的破窗帘
liy
11年4个月前
发表于
极客DIY
上半年自己利用业余时间包了个阳光房,夏天热老婆让俺买窗帘,后来在搞飞艇,买了很多大塑料布,索性自己做了块大铺盖,完全以穷屌丝的思路彻底解决太阳晒的问题。
低成本
单电源仪用放大电路。
novakon
11年2个月前
发表于
电子技术
本帖最后由 novakon 于 2013-11-6 15:12 编辑 应变片压力采集是火箭爱好活动中很重要的一个环节,本人刚刚学模电,最近在做这方面的研究。 HX711 和 sd0809/sd0819都是专门干这个的(还可以省去一片ADC),之前航天局出品的USB推力计就是基于HX711的,但是这次我希望尝试一下自己搭建仪用放大器(看看有没有可能把器件成本控制在5元以内)。不止是应变片采集,在其...
一种
低成本
ppr固体发动机喷口的设想
悟死参玄
1年8个月前
发表于
喷气推进
动手实践: 实验报导,严肃内容: 教程/课程
内容:但是不可否认,这种喷管只是在
低成本
下的权宜之计,有条件还是3d打印模具或者车一个吧。
较
低成本
简单制作发动机推力数据收集
LSEQY
1年4个月前
发表于
喷气推进
电子技术
内容:这就是我说为什么
低成本
了。 ,这就是我说为什么
低成本
了。
自己研制的
低成本
纸质发动机……
BenjaminMurphy
6年4个月前
发表于
喷气推进
LZ只是一个普通高中生,没什么专业知识,看别人玩多了自己也想弄支火箭玩玩。但是金属材料没有路子弄,于是就弄了这个…… 希望以后有大佬多多指点(发动机还在改进当中) 今天进行了一次试飞,但是由于堵头工艺不行,火箭箭体设计有问题,发动机刚刚点火,内部气压就把堵头以上的部分全推飞了,不过发动机完好,喷口也没有损坏。正在准备下一次试飞 (发动机材料是硬质纸筒和A4纸,尾翼是A4纸加工的 )
关于
低成本
极低污染制备n2o5的想法
I一个一个一个一个碘
1年5个月前
发表于
化学
五氧化二氮又叫 硝酸酐 可以和水反应产生硝酸,但是这种物质很难买到,或者说很贵。一般来说用五氧化二磷与硝酸可以制出 但是五氧化二氮在30度就会变成液体 价格昂贵不说 且与磷酸混合不好分离 所以我想了一种特殊的合成方法使用制氧机 对 医院那种制氧机 作为o2的来源 经过大功率特斯拉电圈而电为臭氧 3o2=电=2o3而氮氧化物来源来自亚硝酸钠和硫反应2nano2+h2so4=na2so4+2hno...
[求助]如何进行两点间的
低成本
CW()通信
3ha510
12年9个月前
发表于
无线电
情况:大约相距20km,目前没有HF电台设备... 如何可以通过diy 简易的QRP电台实现莫尔斯码(CW)通信么?
低成本
光纤发射头
打字慢
10年4个月前
发表于
高电压技术
本帖最后由 打字慢 于 2014-8-18 15:41 编辑 最近迷上了tc,于是买了一个带光纤头的驱动板。但是灭弧也要买一个发射头,上网一查,发现需要40RMB,看到这个价格,我吐血了........ 然后,上网查一查驱动板的光纤头是多少nm的,发现是820nm的。我想了想,电视机的遥控器的红外管不是850nm的吗?于是去电子商店买了一个回来,接上灭弧,插入驱动板光纤头,发...
简易
低成本
宠物空调窗机,制冷制热
vw1
9年6个月前
发表于
极客DIY
我又来了 做了一期空调别墅之后,二期正在展开中,总结一期的各种问题和设计,二期准备大动作修改,主要是增加通用性和构件成熟度。 这个空调窗机可以独立实用,也可以装置在封闭环境内。 老规矩,话不多说上图 主体结构,大都是商购件,成本尚可,100多,后面总结 总装之后效果,主体有两部分组成,散热窗机+水循环冷热单元 总装之后温度测试,地表28.7度,窗机下面24.6-〉23.5-〉继续下降i...
==建立
低成本
射频实验室-之-无源器件篇==
RodTech
10年5个月前
发表于
仪器仪表
本帖最后由 RodTech 于 2014-7-21 13:39 编辑 高中刚毕业,settle了,总结下6年来作为射频外行的入门经验 considerable evidence confirms that从代理商进货搭建个人业余实验室不够经济(包括国内厂家也非常昂贵),除非迫不得已(eg校准器件),我一般选择从洋垃圾里找/拆。why?cuz一条好的射频电缆,就可能花费您数万元,更别提bias-...
目前国内最
低成本
(大概)Fusor制作的研究报告及经验分享
米酷二二三
1年4个月前
发表于
核技术与核仪器
高电压技术
动手实践: 实验报导,严肃内容: 专著/论述
内容:希望能为后面尝试
低成本
自制Fusor的朋友提供一些参考。
(萌新)
低成本
配蓝牙耳机(连载、请教、讨论)
狼狼1
4年10个月前
发表于
极客DIY
额,以后应该会持续更新。但愿不是水贴突然想到开学了上课如何听音乐的问题,所以趁现在抓紧时间整个耳机。上课听当然蓝牙最好,老师收了耳机还可以保住mp3哈哈哈本来想整个动铁,然后转念一想如果动铁耳机上课被没收岂不是亏大了,所以综上所述还是动圈吧。耳机预算40元,结果配下来连运费只遭了差不多15(单个成本)。主要是得益于门口的废品收购站单元5元一对线材平均0.2元一条电池平均0.6元一个运费8元淘宝上蓝...
30元以内,
低成本
金属固体发动机方案介绍
猎鹰
5年6个月前
发表于
喷气推进
内容:其
低成本
,高性能,易购买等优点在美国爱好者中得到了充分应用。
自制超
低成本
ESP32空心杯四轴,发现动力不足
smith
2年5个月前
发表于
极客DIY
电子技术
飞控用ESP32 Devkit的模组做的, 原理图如上, 一部分参考esp-drone工程。 带动4只8520 1S电动机MOS驱动电路, 偷懒直接用了家里有的元件, AOD422,查了一下这个MOS管可以在2.4V的电压导通,而且说是电阻很小结果调试的时候, 发现动力不足,有一只马达甚至不转, 直接用ESP32的GPIO把PWM输入高电平也不行。检查发现,锂电池的电压是3.8V, esp3...
可取代手机的
低成本
普及化AR眼机实用样品
测量因果
5个月20天前
发表于
电子技术
极客DIY
动手实践: 实验报导
这是一种可取代手机的增强现实AR设备,比手机成本更低,可大规模普及化,粗糙版样品手工迭代多次后体验还不错,以下为测试图文与视频。 目录: 1、AR眼机原理与构造 2、眼机相对手机优劣分析 3、眼机粗糙版样品测试 4、用户试用感受 5、研究历程 6、量产展望 7、样品镜片赠送福利 一、AR眼机原理与构造 本增强现实设备暂取名AR眼机...
软驱改造的简易激光雕刻机(超
低成本
)。
njlirong
11年0个月前
发表于
极客DIY
看了 果壳的废旧光驱的涅槃之路后想仿制。没步进电机控制板怎么办? 找软驱 先上完工图 主要材料:两个3.5寸软驱, 一个光驱(带步进电机的那种废品收购站找) 250mw激光头组件(网购)或者拆dvd刻录机 软件用 MACH3 软磁盘驱动器改造原理 1.软盘控制器根据主机命令,向驱动器发出驱动器选择信号DS(...
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