变形V3.0

SNDR用于ADC计算信号噪声比，仅供参考学习，~~~(SNDR for ADC signal to noise ration calculation, for ur ref,~~~~~)

BK4815模块基本功能，对讲机最小模块(The basic functions of the BK4815 module)

说明：  基于51/52单片机 1，探测环境温度，以LCD1602 做显示单元 2，可设置上限/下限数值，从而做到警报的提醒及应急设施的启动 3，超过设置限值时，会启动 LED 、蜂鸣器以及电机（仿真时使用）应用可使用其他代替(Based on 51 / 52 single chip microcomputer 1. Detect the ambient temperature with LCD1602 as the display unit 2. The upper / lower limit value can be set to remind the alarm and start the emergency facilities 3. When the setting limit is exceeded, the LED, buzzer and motor (used in simulation) application will be started, and other alternatives can be used)

DDR4原理图 PCB参考。 pdf版本原理图以及allegro PCB文件。(cadence ddr4 allegro pdf)

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.)

说明：  全志A33芯片资料，包括芯片手册，用户使用说明等等(Quanzhi A33 Chip Data)

说明：  微带滤波器设计，包括低通、带通和高通三型滤波器参数设计，能够设置频率范围，自动生成滤波器参数。(Microstrip filter design, including low-pass, band-pass and high pass filter parameter design, can set the frequency range, automatically generate filter parameters.)

说明：  Texas Instruments常用元件库 TI Analog Timer Circuit.IntLib TI Logic Flip-Flop.IntLib TI Logic Gate 1.IntLib TI Logic Gate 2.IntLib TI Logic Latch.IntLib TI Logic Switch.IntLib TI Power Mgt Voltage Reference.IntLib TI Power Mgt Voltage Regulator.IntLib Texas Instruments Footprints.PcbLib等等(Texas Instruments TI Analog Timer Circuit.IntLib TI Logic Flip-Flop.IntLib TI Logic Gate 1.IntLib TI Logic Gate 2.IntLib TI Logic Latch.IntLib TI Logic Switch.IntLib TI Power Mgt Voltage Reference.IntLib TI Power Mgt Voltage Regulator.IntLib Texas Instruments Footprints.PcbLib)

说明：  基于单片机的电阻、电容、电感测试仪 可测电容，电感，电阻等元器件的值(Resistance, Capacitance and Inductance Tester Based on Single Chip Microcomputer)

说明：  一个高性能麦克风电路设计，电路具有高保真润色好等等特点(A High Performance Microphone Circuit Design)