[부산대 이학전자실험] 8. 555 timer-2

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1. Astable Circuit

Astable Circuit은 출력 파형이 주기적으로 변화하는 회로입니다. 다이오드가 없을 때와 있을 때의 식을 통해 Mark Time(출력 High 상태 유지 시간)과 Space Time(출력 Low 상태 유지 시간)을 계산할 수 있습니다. 또한 Duty Cycle(충격 계수)을 구할 수 있습니다. 실험에서는 Duty Cycle이 50%가 되도록 회로를 구성하고, 다이오드 유무에 따른 변화를 관찰하였습니다.
2. Bistable Circuit

Bistable Circuit은 두 개의 안정 상태를 가지는 회로로, Set과 Reset 입력에 따라 출력이 변화합니다. 실험에서는 Bistable Circuit을 구성하고 Trigger 스위치와 Reset 스위치를 눌러 출력 변화를 관찰하였습니다.

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1. Astable Circuit

An astable circuit, also known as a free-running multivibrator, is an electronic circuit that generates a continuous stream of square or rectangular pulses without any external trigger. This type of circuit is widely used in various applications, such as clock generators, timing circuits, and pulse-width modulation (PWM) controllers. The key feature of an astable circuit is that it does not have a stable state, meaning it continuously oscillates between two states, switching back and forth without any external input. This oscillation is achieved through the use of a pair of transistors or logic gates, coupled with a resistor-capacitor (RC) network that determines the frequency and duty cycle of the output waveform. The operation of an astable circuit can be described as follows: When power is applied, one of the transistors or gates turns on, causing the other to turn off. The capacitor in the RC network then charges or discharges, and when it reaches a certain threshold, the state of the circuit flips, causing the other transistor or gate to turn on and the first one to turn off. This cycle repeats continuously, generating the square or rectangular pulses. The frequency and duty cycle of the output waveform can be adjusted by changing the values of the resistors and capacitors in the RC network. This flexibility makes astable circuits useful in a wide range of applications, such as clock generation, timing control, and signal processing. Overall, the astable circuit is a fundamental building block in electronic design, providing a reliable and versatile way to generate periodic signals for various electronic systems and devices.
2. Bistable Circuit

A bistable circuit, also known as a flip-flop, is an electronic circuit that has two stable states and can be used to store binary information. Unlike an astable circuit, which continuously oscillates between two states, a bistable circuit remains in one of its two stable states until it is triggered to switch to the other state. The key feature of a bistable circuit is its ability to maintain a specific state, even in the absence of an input signal. This makes it useful for a variety of applications, such as digital memory, counters, and logic gates. The operation of a bistable circuit can be described as follows: The circuit has two inputs, typically labeled 'Set' and 'Reset', which can be used to change the state of the circuit. When the 'Set' input is activated, the circuit switches to the 'Set' state and remains in that state until the 'Reset' input is activated, at which point the circuit switches to the 'Reset' state. Bistable circuits can be implemented using a variety of electronic components, such as transistors, logic gates, or specialized integrated circuits. The specific design of the circuit determines its characteristics, such as the speed of switching, the power consumption, and the ability to withstand noise or interference. Bistable circuits are widely used in digital electronics, where they form the building blocks of more complex circuits, such as counters, shift registers, and memory devices. They are also used in analog electronics, where they can be used for signal conditioning, waveform shaping, and other applications. Overall, the bistable circuit is a fundamental building block in electronic design, providing a reliable and versatile way to store and manipulate binary information in a wide range of electronic systems and devices.