直流稳压加保护

抱闸控制器，用PWM方式控制电机抱闸，在有效开通抱闸情况下缓解抱闸发热(The brake controller, using PWM to control the motor brake, brake in effective opening off brake fever)

常用的有源晶振封装库和原理图库，AD环境。(AD environment commonly used active crystal package library and schematic library)

MC68340驱动TNT4882，实现GPIB接口通讯(TNT4882 in an MC68340 System)

MT7620N SCH&PCB,you can reference it to design yourselef.

说明：  rtl8370单芯片8口千兆交换机原理图(Rtl8370 single chip 8 gigabit switch schematic diagram)

超声波模块制作了一个测距装置，HC-SR04自身不带温度补偿功能，所以加上一个使用DS18B20做的温度测量模块。整个系统包括：51单片机最小系统，超声波测距模块、温度测量模块、液晶显示模块。(The ultrasonic module has made a distance measuring device, HC-SR04 does not have temperature compensation function, so add a temperature measuring module using DS18B20. The whole system includes 51 single chip microcomputer minimum system, ultrasonic ranging module, temperature measurement module and LCD module.)

文件中包含stm32开发板所配套的开关使用说明的程序例程，重在讲解开关是如何被使用的，在kEIL5软件上怎么编写的。(The document contains the program routine of the switch instructions matched by STM32 development board, focusing on how the switch is used and how to write on kEIL5 software.)

说明：  wireless charging source code.

4G模块EC20开发资料，硬件设计手册，AT指令，原理图和PCB图封装，完整开发资料。(Development Data of 4G Module EC20 and Hardware Design Manual)

spice user Mannual is one kind mannal to inroduce how to build up the simulation files step by step