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1 ECE 2C Laboratory Manual 5 Infrared PWM Receiver Overview In this lab you will construct the receiver circuit to complement the PWM transmitter board you assembled last week. This receiver detects, amplifies, and demodulates a 40 khz PWM infrared signal. In the 1 st week you will construct the receiver circuit with some rudimentary testing. In the second week we will put together a complete system combining the microphone and amplifier circuits of Lab 1, and explore the limits of the system with respect to operating distances. Table of Contents Pre-lab Preparation 2 Parts List 2 Full Schematics for IR PWM Receiver 3 In-Lab Procedure Detector/HP Filter Section Signal Conditioning Circuit Demodulation 6 1 Bob York

2 2 Infrared PWM Receiver Pre-lab Preparation You have two weeks to complete this lab. Read through the lab experiment to familiarize yourself with the components and assembly sequence, and complete the calculations below. Before coming to the lab, each group should obtain a parts kit from the ECE Shop. Bring your solder-less breadboard, tools, & wire jumpers, as well as the IR transmitter from Lab 4 and the power-supply from ECE 2B. Required calculations: Determine the maximum capacitance C8/C9 in the 2 nd -order HP filter stage that will give at least 26dB of rejection at 120 Hz. What is the resulting HP cutoff frequency? C8/C9= uf f HP = Hz For a peak photodiode current I photo, find an expression for the signal voltage after the first four op-amp stages (i.e. at the output of U3D). Express your answer in terms of R12-R20. V out = Parts List Qty Description Circuit Semiconductors 2 Op-Amp, (DIP-14) U3, U4 4 DIODE, 1N4148 D1-D4 2 n-ch JFET, 2N5485 Q3,Q4 Passives 8 RESISTOR, 10% 1/4W R13, R15, R17, R18, R19, R21 2 RESISTOR, 2.2kΩ 10% 1/4W 3 RESISTOR, 4.7kΩ 10% 1/4W R14, R16, R20 4 RESISTOR, 47kΩ 10% R12, R25 6 RESISTOR, 10% 1/4W R24, R RESISTOR, 100kΩ 10% R22 1 POTENTIOMET ER, 2k Ω R23 1 CAPACITOR, 10pF 20% C7 1 CAPACITOR, 0.001µF 10% (low-volt ceramic) C12 2 CAPACITOR, µF 10% (low-volt ceramic) C13, C14 2 CAPACITOR, 0.047µF 10% (low-volt ceramic) C8, C9 1 CAPACITOR, 0.01µF 20% 8 CAPACITOR, 20% C5, C6, C10, C11, C15, C16 2 CAP_ELECTROLIT, 100µF 20% Bob York 2

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