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Unformatted text preview: Final Project: Music Toybox EE40 Summer 2011 V. Lee 1 Music Toybox MUSIC TOYBOX ELECTRICAL ENGINEERING 40 INTRODUCTION TO MICROELECTRONIC CIRCUITS University Of California, Berkeley Department of Electrical Engineering and Computer Sciences Neel Shah, Vincent Lee Lab Contents: I. Overview II. Background III. Analysis Phase a. The Solar Cell Amplifier Module b. The LM555 Timer Pulse Position Modulation Module c. The Audio Amplifier Module d. The Analog Multiplexor Module e. The Photoresistor Controlled Amplifier Module f. The LED Display Bar Graph Module IV. Design Phase a. Design Specifications i. The Filter Module Specification ii. The Sensor Input Module Specification b. The Filter Modules i. The Active Low Pass Filter ii. The Active High Pass Filter iii. The Active Band Pass Filter c. The Sensor Input Modules V. Soldering and Prototyping Phase VI. Analysis Questions VII. Lab Report Submissions Project Score: ___/250 YOUR NAME: YOUR SID: YOUR PARTNERS NAME: YOUR PARTNERS SID: Final Project: Music Toybox EE40 Summer 2011 V. Lee 2 Overview For this project you will be completing the PCB that we started soldering in the first lab. Recall that in the last lab we finished building an audio input module and pulse position modulating stage which we were able to output on the speaker. In addition we had an LED bar graph that functioned as a volume indicator. In this final phase of your board, we will be adding sensor inputs and filter stages. In the second phase of soldering, you added a MAX4518 analog multiplexor to your circuit. It didnt actually change anything since it still passed the signal to the output. In this final soldering phase, you will be providing three additional signal pathways through your circuit which the multiplexor will choose from. The three filters you will have to design and build are: active low pass, active band pass, and active high pass. Furthermore, these will all have to adhere to reasonable specifications that we will outline later. We will also design and build a sensor network that will drive the control bits to the analog multiplexor. For this module of the circuit, you will have several different options to choose from as your sensor inputs: an accelerometer, a blood oxygen sensor, a light or infrared sensor, or a sensor of your choice. You will have to drive two multiplexor control bits so you can mix and match what two sensors you wish to use. If you have particular type of sensor that you want to use, you can request it and we will try and get it for you. Background In computer applications, we often have to pick and choose from the data streams that we wish to express. For instance, if we have four channels of data and we only want to observe one, we have to be able to pass one channel and suppress the other three. Moreover, we may also want to process each channel of data simultaneously and have to rapidly switch between data channels depending on data acquisition from some dynamic sensor network....
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