lab ELEC2501

# lab ELEC2501 - CARLETON UNIVERSITY Department of...

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CARLETON UNIVERSITY Department of Electronics ELEC 2501 Circuits and Signals LAB MANUAL 2009 By P. D. van der Puije Revision 5 By: T. G. Ray K. Yadav

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Carleton University, Department of Electronics ELEC 2501 Lab Manual ELEC 2501 Lab 0 Page 1 of 3 LAB 0: Soldering PURPOSE To learn circuit prototyping and soldering skills. EQUIPMENT (i) Soldering iron, exhaust fan and solder. (ii) Phase shift quadrature oscillator PCB. (iii) ± 15 V DC power supply (iv) LM324N operational amplifier chip. (v) Resistors and capacitors. (vi) 40 Ω loudspeaker. BACKGROUND This lab will begin with a video, which discusses safety and soldering techniques. You must watch this video prior to beginning the lab! In this lab, you will solder the components onto a printed circuit board (PCB) to create a phase shift quadrature oscillator – a circuit, which can be used to generate tones at various frequencies. Figure 1 shows the phase shift quadrature oscillator circuit. Figure 1. Phase shift quadrature oscillator circuit. The printed circuit board that you will be using forms the connections between the different components. However, the components themselves are missing. You will select the right components, solder them onto the PCB, and test the final board with a loudspeaker. The frequency generated by the quadrature oscillator circuit depends on the values of the components used, and it is given by: f = 1 2 π RC (1) where R is the value of R 1 or R 2 (each has the same resistance value) in Figure 1, and C is the value of C 1 or C 2 (each has the same capacitance value). The audible range of frequencies spans between 20 Hz and 20 kHz, so if R and C are chosen such that f falls within this range, the tone produced by the phase shift quadrature oscillator circuit will be audible.
Carleton University, Department of Electronics ELEC 2501 Lab Manual ELEC 2501 Lab 0 Page 2 of 3 Note that at this point you are not expected to fully understand the operation of the circuit shown in Figure 1. You will learn the relevant concepts in this and future electronics courses: 1/RC time constant (ELEC 2501) operational amplifiers (ELEC 2507) oscillators (ELEC 3509) PROCEDURE Part 1. Soldering the Components 1.1 Turn on your soldering iron and the exhaust fan. Make sure that the sponge of the soldering iron is moderately wet. 1.2 Find the phase shift quadrature oscillator circuit board. Note that the PCB has two sides. The top side includes labels for all the components and connections. This is the side from which the components are inserted. All the soldering will be done on the bottom side of the PCB. The lines that can be observed on both sides are the electrical connections between the components. 1.3

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## This note was uploaded on 09/27/2010 for the course ELEC 45245 taught by Professor Paper during the Spring '10 term at California Coast University.

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lab ELEC2501 - CARLETON UNIVERSITY Department of...

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