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Deals with the sinusoidal response of simple circuits made up of capacitors, inductors and resistors.
Metadata describing this Open University video programme
Module code and title: TS282, Electromagnetics and electronics
Item code: TS282; 07
First transmission date: 08-04-1973
Published: 1973
Rights Statement:
Restrictions on use:
Duration: 00:24:00
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Producer: Tony Jolly
Contributor: Gary Alexander
Publisher: BBC Open University
Keyword(s): Electric organ; Filters; Fourier analysis; Fourier synthesis; Impedance; LCR circuit; Phasors; Pure sine wave; Resonance; Sinusoidal response
Footage description: Peter Chapman is shown apparently playing a clarinet. Pan to Gary Alexander who is actually producing the sound on an electronic organ. Peter shows, using an oscilloscope, how the sounds are produced and demonstrates one of the sound generators. Using a model, Peter demonstrates the resonance of a series RLC circuit together with the effect of varying the signal frequency in RL and RC circuits. Using diagrams, oscilloscope and a circuit, Gary discusses properties of sine waves and shows what happens when two sine waves of identical frequency but differing phase and amplitude are added. Gary explains the importance of the phasor, using a computer film. Peter demonstrates the variation of impedance of a resonant RLC circuit when the frequency is changed. Gary at the organ shows how a simple filter circuit can be tuned to accept only harmonics of a pure sine wave so as to filter out a single frequency from the complex clarinet waveform. Credits over Gary playing organ and Peter faking clarinet.
Master spool number: 6LT/70425
Production number: 00521_2106
Videofinder number: 701
Available to public: no