Industrial controls make heavy use of 4- to 20-mA current loops to transmit process measurements because current loops retain information in the presence of noise and changes in loop voltage. The loop circuit requires proper calibration to ensure acc…

A previous Design Idea describes a programmable current source that used a three-terminal National Semiconductor LM317 adjustable regulator (Reference 1). Although that circuit lets you program the output current, the load current flowed through the…

Arduino 常见型号 当然还有 LilyPad,附图: 最常见的自然是UNO,最新版是第三版R3: 国内也有一些改进的板子.我用的是一般的板子,拿到货也只能默默了. 简介 The Uno is a microcontroller board based on the ATmega328P. It has 14 digital   input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs,    a 1…

LDO current regulator for power LED Challenge You've got a power LED? Great! Build a flash light! What does the spec say? "Voltage: 3.6 .. 3.8 V, power 3 W." Okay. This means that it draws some 800 mA. Three mignon cells give 4.5 V for at least…

Engineering labs are usually equipped with various power supplies, voltmeters, function generators, and oscilloscopes. One piece of equipment missing from many such labs, however, is a current source. This omission is unfortunate, because a current s…

java 8是如何处理时间及日期的 有人问我学习一个新库的最佳途径是什么?我的回答是,就是在实际项目中那样去使用它.在一个真实的项目中会有各种各样的需求,这会促使开发人员去探索和研究这个新库.简言之,只有任务本身才会真正促使你去探索及学习.java 8的新的日期及时间API也是一样.为了学习Java 8的这个新库,这里我创建了20个以任务为导向的例子.我们先从一个简单的任务开始,比如说如何用Java 8的时间日期库来表示今天,接着再进一步生成一个带时间及时区的完整日期,然后再研究下如何完成一些更…

除了lambda表达,stream以及从一些小的改进,Java 8还推出了新的日期和时间API,在本教程中,我们将展示通过几个简单的任务来学习如何使用示例Java 8这组API.Java至今.日历和时间已经被批评,特别是,它决定java.util.Date为可改动的以及将SimpleDateFormat实现成非线程安全的.看来Java已经意识到须要为时间及日期功能提供更好的支持了,这对已经习惯使用Joda时间日期库的社区而言也是件好事. 关于这个新的时间日期库的最大的长处就在于它定义清楚了时间日…

本文由 ImportNew - Sandy 翻译自 javarevisited.欢迎加入翻译小组.转载请见文末要求. 伴随lambda表达式.streams以及一系列小优化,Java 8 推出了全新的日期时间API,在教程中我们将通过一些简单的实例来学习如何使用新API.Java处理日期.日历和时间的方式一直为社区所诟病,将 java.util.Date设定为可变类型,以及SimpleDateFormat的非线程安全使其应用非常受限.Java也意识到需要一个更好的 API来满足社区中已经习惯了使…

http://e2e.ti.com/blogs_/b/analogwire/archive/tags/DAC%2bEssentials DAC Essentials: A new blog series A digital-to-analog converter, or DAC, performs the opposite function of an analog-to-digital converter, or ADC. Duh, right? But, have you ever wond…

http://pdfserv.maximintegrated.com/en/an/AN818.pdf http://www.maximintegrated.com/app-notes/index.mvp/id/818 Digital Adjustment of DC-DC Converter Output Voltage in Portable Applications Abstract: This tutorial discusses methods for digitally adjusti…