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Switch debouncer uses only one gate
The circuit inFigure 1produces a single debounced pulse each time you press S1. Moreover, the circuit uses only logic power from the remote pull-up re...
分类:其他好文   时间:2014-11-28 15:46:59    阅读次数:174
Simple dc/dc converter increases available power in dual-voltage system
The schematic inFigure 1shows a way to increase the power available from a current-limited 5V supply by adding power from a –5V supply. The dc/dc conv...
分类:其他好文   时间:2014-11-28 14:24:24    阅读次数:205
Dual-polarity supply provides ±12V from one IC
Well-regulated, dual-polarity power supplies find wide use in disk-drive, handheld-device, automotive, and notebook-computer applications. In these ap...
分类:其他好文   时间:2014-11-28 14:15:58    阅读次数:315
Dual-voltage regulator meets USB-power needs
This Design Idea stems from the limited availability of IC voltage regulators that can meet key USB-power specs, coupled with the need for turn-on seq...
分类:其他好文   时间:2014-11-28 14:04:34    阅读次数:162
Use a TL431 shunt regulator to limit high ac input voltage
Most isolated, offline SMPSs (switched-mode power supplies), including flyback, forward, and resonant, must operate at input voltages of 90 to 260V rm...
分类:其他好文   时间:2014-11-28 11:41:42    阅读次数:145
Tiny microcontroller hosts dual dc/dc-boost converters
Batteries are the typical power sources for portable-system applications, and it is not unusual these days to find microcontroller-based portable syst...
分类:其他好文   时间:2014-11-28 11:35:12    阅读次数:342
sql进制之间的转换
-----二进制转换十进制----------------- select sum(data1) from ( select substring('11011', number, 1)*power(2,len('11011')-number)data1 from (select number from master.dbo.spt_values where type='p...
分类:数据库   时间:2014-11-27 12:50:11    阅读次数:258
POJ3233:Matrix Power Series(矩阵快速幂+二分)
http://poj.org/problem?id=3233题目大意:给定矩阵A,求A + A^2 + A^3 + … + A^k的结果(两个矩阵相加就是对应位置分别相加)。输出的数据mod m。k#include #include #include #include #include using ...
分类:其他好文   时间:2014-11-26 22:10:20    阅读次数:211
无显示屏的开发板抓屏
1, 命令获取当前屏幕截图:adb shellcd dev/graphics/gsnap /data/XXX.png fb0然后把XXX.png拷贝出来查看即可。2, 保持屏幕常亮的命令adb shellsvc power stayon [true|false|usb|ac] 设置屏幕的常亮,tru...
分类:其他好文   时间:2014-11-26 10:58:21    阅读次数:161
android 模拟冻屏 代码实现
思路: 第一种方案:屏蔽除power外的其他按键,屏蔽状态栏下拉,屏蔽触屏。 代码如下: 需要系统签名: 添加权限:         package com.example.demo; import android.app.Activity; import android.os.Bundle; import android.view.KeyE...
分类:移动开发   时间:2014-11-25 16:33:25    阅读次数:336
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