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...
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其他好文 时间:
2014-11-28 15:46:59
阅读次数:
174
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...
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其他好文 时间:
2014-11-28 14:24:24
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205
Well-regulated, dual-polarity power supplies find wide use in disk-drive, handheld-device, automotive, and notebook-computer applications. In these ap...
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其他好文 时间:
2014-11-28 14:15:58
阅读次数:
315
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...
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其他好文 时间:
2014-11-28 14:04:34
阅读次数:
162
Most isolated, offline SMPSs (switched-mode power supplies), including flyback, forward, and resonant, must operate at input voltages of 90 to 260V rm...
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其他好文 时间:
2014-11-28 11:41:42
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145
Batteries are the typical power sources for portable-system applications, and it is not unusual these days to find microcontroller-based portable syst...
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其他好文 时间:
2014-11-28 11:35:12
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342
-----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...
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数据库 时间:
2014-11-27 12:50:11
阅读次数:
258
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 ...
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其他好文 时间:
2014-11-26 22:10:20
阅读次数:
211
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...
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其他好文 时间:
2014-11-26 10:58:21
阅读次数:
161
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...
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移动开发 时间:
2014-11-25 16:33:25
阅读次数:
336