# Lissajous Pattern QuizSeptember 1963 Popular Electronics

 September 1963 Popular Electronics   [Table of Contents People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April 1985. All copyrights are hereby acknowledged. See all articles from Popular Electronics.

Jules Antoine Lissajous was a French mathematician who in the days before oscilloscopes concerned himself with patterns (waveforms) that would be generated as the result of two separate functions (signals) driving both the x- and y-axes. Lissajous used mechanical vibration devices connected to mirrors to bounce light beams onto a projection surface, so his results were not merely hand-drawn plots on graph paper. He was probably as mesmerized with them as we are today when they appear. Sci-fi movies have used Lissajous patterns in the background to 'wow' the audience into thinking it is witnessing futuristic, cutting-edge technology. When troubleshooting analog circuits, it is very advantageous to have seen and recognize many different types of waveforms so that you have a better chance of picking out patterns when you see them again. Finding sources of interference and power supply modulation are good examples. This quiz will helps you get started or test your already finely honed knowledge of Lissajous patterns.

Lissajous Pattern Quiz

By Robert P. Balin

A good technician, knowing what sine-wave signals are simultaneously applied to the horizontal and vertical inputs of an oscilloscope, can predict what the displayed Lissajous pattern will be. In this quiz, the same signal is applied to both amplifiers, but through combinations of impedances that cause differences in the phase angle and amplitude of the actual a.c. voltages reaching the inputs. All resistances and reactances have the same ohmic impedance at the applied frequency, the gain of both amplifiers is equal, and positive-going voltage deflects the spot upward, or to the right. See if you can match up the input circuits (1 - 6) with the patterns (A - F) produced.

Popular Electronics published many quizzes over the years - some really simple and others not so simple. Robert Balin created many of the quizzes. This is a listing of all I have posted thus far.

 Electronics IQ Quiz - May 1967 Plug and Jack Quiz - December 1967 Electronic Switching Quiz - October 1967 Electronic Angle Quiz - September 1967 International Electronics Quiz - July 1967 Bridge Circuit Quiz -December 1966 Diode Function Quiz - August 1965 Diagram Quiz, August 1966 TV Trouble Quiz, July 1966 Electronics History Quiz, December 1965 Scope-Trace Quiz, March 1965 Electronic Circuit Analogy Quiz, April 1973 Test Your Knowledge of Semiconductors, August 1972 Ganged Switching Quiz, April 1972 Lamp Brightness Quiz, January 1969 Lissajous Pattern Quiz, September 1963 Electronic Quizoo, October 1962 Electronic Photo Album Quiz, March 1963 Electronic Alphabet Quiz, May 1963 Quiz: Resistive? Inductive? or Capacitive?, October 1960 Vector-Circuit Matching Quiz, June 1970 Inductance Quiz, September 1961 RC Circuit Quiz, June 1963 Diode Quiz, July 1961 Electronic Curves Quiz, February 1963 Electronic Numbers Quiz, December 1962 Energy Conversion Quiz, April 1963 Coil Function Quiz, June 1962 Semiconductor Quiz - February 1967 Unknown Frequency Quiz - September 1965 Electronics Metals Quiz - October 1964 Electronics Measurement Quiz - August 1967 Meter-Reading Quiz, June 1966 Electronic Geometry Quiz, January 1965 Electronic Factor Quiz, November 1966 Electronics Math Quiz, November 1965 Series Circuit Quiz, May 1966 Electrochemistry Quiz, March 1966 Electronic Analogy Quiz, November 1961 Electronic Coupling Quiz, August 1973 Electronics Analogy Quiz, August 1960 Audio Quiz, April 1955 Electronic Unit Quiz, May 1962 Capacitor Circuit Quiz, June 1968 Quiz on AC Circuit Theory, December 1970 Magnetic Phenomena Quiz, February 1962 Electronics Geography Quiz, April 1970 Electronic Menu Quiz, August 1963 Electronic Noise Quiz, August 1962 Electronic Current Quiz, October 1963 Electronic Inventors Quiz, November 1963 Resistor Function Quiz, January 1962 Electronic Measurement Quiz, January 1963 Vacuum Tube Quiz, February 1961 Kool-Keeping Kwiz, June 1970

1 - E

V = .707E; H = E

2 - D

V = E

H = O

3 - A

V = O

H = E

4 - F

V = H = E/2

V is 180° out-of-phase with H

5 - B

V = .707E

H = .707E

V leads H by 90°, but signals are taken off 180° out-of-phase; hence V lags H by 90°

6 - C

V = E

H = E

V and H in phase

Posted February 1, 2015

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