Lab 5 RC Circuits and LM555 Timer 2.1B v2

Lab 5 RC Circuits and LM555 Timer 2.1B v2 - Lab 5: RC...

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Lab 5: RC Circuits EE40 Summer 2011 N. Shah, V. Lee, L. Dai 1 RC Circuits and the LM555 Timer LAB 5: RC CIRCUITS AND THE LM555 TIMER ELECTRICAL ENGINEERING 40 INTRODUCTION TO MICROELECTRONIC CIRCUITS University Of California, Berkeley Department of Electrical Engineering and Computer Sciences Neel Shah, Vincent Lee, Linda Dai Lab Contents: I. Lab Objectives II. Pre-Lab Component a. The LM555 Timer b. Modeling the LM555 Timer III. Lab Component a. Building a model of the 555 Timer b. The Monostable Configuration c. The Astable Configuration d. Soldering Phase II: Pulse Position Modulation IV. Lab Report Submissions 1 a. Image Citations 1 DUE July 29 th , 2011 at the beginning of lab YOUR NAME: YOUR SID: YOUR PARTNER’S NAME: YOUR PARTNER’S SID: Pre-Lab __/55 Lab __/45 Soldering __/25 Total ___/125
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Lab 5: RC Circuits EE40 Summer 2011 N. Shah, V. Lee, L. Dai 2 Lab Objectives This lab is designed to familiarize you with the properties and applications of resistors and capacitors. Recall, that capacitors vastly expand the possible types of circuits at our disposal because they resist changes in voltage. The LM555 timer, one of the most commonly used ICs in the world, 2 exploits the properties of RC networks to produce a quasi-square waveform with a constant period and duty cycle. In this lab, we will apply what we learned about operational amplifiers and basic circuit principles with capacitors to build a model of the LM555 timer. Finally, we will explore the different applications of the LM555 timers by building a primitive audio synthesizer. Pre-Lab The LM555 Timer The 555 timer is a very versatile integrated circuit which can be used in large variety of applications that require precision timing. The main function of a 555 timer is to produces a waveform that manipulates or drives other circuit networks requiring periodic voltage spikes. From the abstraction models in the later sections, you will see that 555 timer with supply voltages ±± and ²³´ outputs a rectangular waveform with a minimum value of µ and maximum values of ±± . There are two important properties of the output waveform that we will consider throughout this lab. The first most important property of the output waveform is its period or frequency. By exploiting the charge and discharge delay of an RC circuit, we can precisely set the period of the waveform using carefully chosen resistor and capacitor values. The second important property of the 555 timer is the duty cycle. The duty cycle refers to the ratio of the charge phase over the total period. Similarly, the duty cycle can also be precisely set by choosing appropriate resistor and capacitor values. As with all ICs that we will work with, we would like you to take a brief look over the datasheet for the LM555 timer found here . Pay particular attention to the monostable, astable, and pulse width modulation circuits as we will be using them in future labs.
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This note was uploaded on 09/09/2011 for the course EECS 40 taught by Professor Chang-hasnain during the Summer '08 term at University of California, Berkeley.

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Lab 5 RC Circuits and LM555 Timer 2.1B v2 - Lab 5: RC...

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