연세대 23-2 기초아날로그실험 A+6주차 예비보고서

문서 내 토픽

1. RC relaxation oscillator

RC relaxation oscillator는 일종의 진동회로로 저항과 커패시터등의 구성 요소들을 사용해 주기적인 출력 신호를 생성하는 회로다. 이는 동작할 때 커패시터가 시간에 따라 충전 및방전되는 과정이 주요 아이디어로 사용된다. 초기에 방전상태로 있던 커패시터는 저항을 통해 전류가 흘러 천천히 충전되기 시작한다. 그리고 커패시터가 충분히 충전돼 특정 Threshold전압에 도달하면 스위치가 작동해 다시 전하가 방전된다.
2. 555 timer IC

The 555 timer IC(integrated circuit)는 펄스 생성, 타이머, oscillator, sequence응용 분야에 사용되는 precision device이다. 이는 사용법이 간단하며 저렴한 가격을 가지고 있어 다양한 분야에서 활용된다. 이 기기는 Astable mode, monostable mode, Bistable mode의 동작 영역을 가지는데 Astable mode에서는 free-running mode로 oscillator로써 동작하고 Monostable mode에서는 Timer로 사용할 수 있으며 "One-Shot"Pulse Generator로 작동한다.
3. Triangular+Square Wave Generator

이번 시뮬레이션에선 그림17과 같은 회로를 PSPICE로 구현했다. PSPICE로 구현하기 전 와 를 만족하는 소자값을 결정해야 했다. 위 그림의 왼쪽 Op-amp는integrator형태를 보이므로 가 성립한다. 오른쪽 Op-amp의 경우는 이 성립하고 이 식을 통해 식을 얻을 수 있다. 즉 가 성립해야 한다.
4. LED flasher in an astable mode

조건을 만족하도록 소자의 값들을 정하였다. astable mode에서는 그림 20과 같은 회로를 그림 21과 같이 구현했다. 구현하기 전 주기가 0.5s, =20ms의 ln ∙ ∙ ln ∙ ∙ 즉 ln ∙ ∙ 이 성립하고이 회로에서는 555IC의 output이 켜졌을 때 트랜지스터가 작동하기 시작한다.
5. LED flasher in a monostable mode

그림24와 같은 회로를 그림25와 같이 구현했다. 이 때 t 이 11ms이므로 조건에 맞는 소자값을 먼저 구했다. 다음의 회로는 t = 를 만족해야하므로 R1을 10k , 을 1uF로 설정하고 회로를 구성하였다. 또한 실제 실험에서는 Push button을 사용해 입력을 조절하지만 PSPICE에선 구현이 어려워 펄스 전원을 사용해 입력을 조절했다.

Easy AI와 토픽 톺아보기

1. RC relaxation oscillator

RC relaxation oscillators are a simple and versatile type of oscillator circuit that generate periodic waveforms using a resistor-capacitor (RC) network. They are widely used in various electronic applications due to their simplicity, low cost, and ability to generate a wide range of frequencies. The basic principle behind an RC relaxation oscillator is the charging and discharging of a capacitor through a resistor, which creates a sawtooth or triangular waveform. By adding additional components, such as comparators or transistors, these oscillators can be used to generate square waves, pulse trains, and other complex waveforms. RC relaxation oscillators are commonly found in timing circuits, clock generators, and various analog and digital circuits. Their simplicity and flexibility make them a popular choice for many electronic design applications.
2. 555 timer IC

The 555 timer IC is a versatile and widely used integrated circuit that can be configured to operate in various modes, including monostable, astable, and bistable. It is known for its simplicity, reliability, and wide range of applications. The 555 timer is particularly useful in generating precise time delays, pulse widths, and oscillating waveforms. Its ability to operate in both monostable and astable modes makes it suitable for a variety of timing and control applications, such as LED flashers, pulse generators, and simple motor control circuits. The 555 timer's popularity is due to its ease of use, low cost, and the availability of numerous application notes and design resources. It remains a staple component in many electronic projects and is still widely used in modern circuit designs, even with the advent of more advanced microcontrollers and digital logic ICs.
3. Triangular+Square Wave Generator

Triangular and square wave generators are essential building blocks in many electronic circuits and systems. The ability to generate these waveforms is crucial for a wide range of applications, including audio synthesis, test and measurement equipment, and various control systems. Triangular wave generators are often based on op-amp or 555 timer circuits, where the capacitor charging and discharging cycles create the characteristic triangular waveform. Square wave generators, on the other hand, can be implemented using digital logic gates, microcontrollers, or specialized ICs like the 555 timer. The combination of triangular and square wave generators allows for the creation of complex waveforms, which can be used in applications such as function generators, audio synthesizers, and even some types of power converters. The versatility and ease of implementation of these waveform generators make them an essential part of many electronic design projects.
4. LED flasher in an astable mode

LED flashers in astable mode are a simple and effective way to create blinking or flashing LED displays. In this configuration, the LED is driven by a circuit that alternates between two stable states, causing the LED to turn on and off at a predetermined frequency. Astable LED flashers are commonly built using 555 timer ICs or op-amp circuits, where the charging and discharging of a capacitor through a resistor network determines the flashing rate. These circuits are widely used in various applications, such as indicator lights, emergency beacons, decorative lighting, and even some types of alarm systems. The ability to easily adjust the flashing rate and duty cycle makes astable LED flashers a versatile and cost-effective solution for many electronic projects. Their simplicity and reliability make them a popular choice among hobbyists and engineers alike.
5. LED flasher in a monostable mode

LED flashers in monostable mode are another useful circuit configuration that can be employed to create blinking or flashing LED displays. In this mode, the circuit is triggered by an external input, such as a switch or a sensor, and the LED is turned on for a predetermined duration before turning off. Monostable LED flashers are often built using 555 timer ICs or other specialized circuits, where the timing is determined by the values of the resistor and capacitor components. These circuits are particularly useful in applications where the LED needs to be triggered by an external event, such as a button press or a sensor activation. Monostable LED flashers can be used in a variety of applications, including indicator lights, warning systems, and even some types of lighting effects. The ability to easily adjust the pulse duration and the triggering mechanism makes monostable LED flashers a versatile and practical solution for many electronic projects.