The easy way to clamp a signal to a given value is to use two zener diodes, connected back-to-back. This method has several disadvantages. The accuracy of the clamping depends on the tolerance of the zener diodes, and the clamping is not adjustable,…

Sound card based RFID sniffer/emulator (Too tired after recon.cx to do draw the schematics better than that :) Stay tuned for the next version including Tag emulation.) baudline FFT signal analyzer for sniffing LF RFID tags using our sound card based…

Transistor Tutorial Summary Transistor Tutorial Summary Bipolar Junction Transistor Tutorial We can summarise this transistors tutorial section as follows: The Bipolar Junction Transistor (BJT) is a three layer device constructed form two semiconduct…

排版有点乱.... ========================================================================= Operational Amplifiers (OAs) are highly stable, high gain dc difference amplifiers. Sincethere is no capacitive coupling between their various amplifying stages, they…

A number of circuits, such as level detectors and AM demodulators, benefit from a rectifier with a low offset voltage. Silicon diodes have an offset of approximately 0.6V and do not work well in low-level circuitry. A Schottky diode is a bit better w…

RFID Exploration Louis Yi, Mary Ruthven, Kevin O'Toole, & Jay Patterson What did you do? We made an Radio Frequency ID (RFID) card reader and, while attempting to create a long-range spoofer, created an jammer which overcomes card's signals. The read…

本文翻译:http://xamlnative.com/2016/04/14/xamarin-forms-a-simple-circular-progress-control/ 里面都是胡说的,如果看不懂可以联系邮箱 源代码:https://github.com/billreiss/xamlnative/tree/master/XamarinForms/CircularProgress 最近作者需要做一个简单的圆形的等待控件在一个Xamarin Forms应用,效果可以看 看起来很容易做,不知道怎…

复制:https://www.cnblogs.com/mschen/p/10199997.html 收集整理了下 Xamarin.Forms 的学习参考资料,分享给大家,稍后会不断补充: UI样式 Snppts: Xamarin Forms UI Snippets. Prebuilt Templates: Jump-start your next project with a prebuilt app. Xamarin.Forms Zeplin extension: Generates XAML…

收集整理了下 Xamarin.Forms 的学习参考资料,分享给大家,稍后会不断补充: UI样式 Snppts: Xamarin Forms UI Snippets. Prebuilt Templates: Jump-start your next project with a prebuilt app. Xamarin.Forms Zeplin extension: Generates XAML for Xamarin.Forms. AiForms.CollectionView: This i…

在django中forms组件有其强大的功能,里面集合和众多的函数和方法:下面来看一下它的源码 """ Form classes """ from __future__ import unicode_literals import copy from collections import OrderedDict from django.core.exceptions import NON_FIELD_ERRORS, ValidationError…