Available online
Description
The programme looks at two examples of the use of analogue electronics, first in medical electronics particularly electrocardiograms and in loudspeaker systems.
The programme looks at two examples of the use of analogue electronics, first in medical electronics particularly electrocardiograms and in loudspeaker systems.
| Module code and title: | T283, Introductory electronics |
|---|---|
| Item code: | T283; 05 |
| First transmission date: | 11-06-1980 |
| Published: | 1980 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:22:18 |
| + Show more... | |
| Producer: | Ted Smith |
| Contributors: | Raymond Cooke; Harry Green; N. W. Heap; Glyn Martin |
| Publisher: | BBC Open University |
| Keyword(s): | Charing Cross; Clinical monitoring; Electrocardiograms; Electronics analogue; Hospital; KEF Electronics Maidstone |
| Footage description: | Shots of cardiac monitoring equipment at Charing Cross Hospital, Glyn Martin introduces the programme. Dr Harry Green, consultant in clinical monitoring at Charing Cross Hospital, explains what the waveforms of the electrocardiogram represent and some of the problems involved in obtaining them. Glyn Martin, with the aid of a circuit board and oscilloscope, explains and demonstrates why a differential amplifier is used in the cardiac monitoring equipment. Dr Green then explains how the equipment is hooked up to the patient and what safeguards are taken to isolate the patient from the mains power supply. Nick Heap, with transform coils and an oscilloscope, demonstrates how the cardiac monitoring equipment above can get DC power for the amplifier across the isolation barrier. Next, using a system diagram, Glyn Martin recaps the way in which the cardiac monitoring system works. Nick Heap then looks at the effect on the output waveform of using a chopper in the circuit board. An oscilloscope is used in his demonstration. Dr Harry Green explains, with the aid of a printout from a cardiac monitoring machine, how heart rate signals are obtained from the wave form output. Glyn Martin then briefly has his ECG taken. The programme next switches from an examination of cardiac monitoring to the design of loudspeaker systems, particularly a system designed and built by K.E.F. Electronics, Maidstone. Glyn Martin starts off by examining the component parts of a loudspeaker. He goes on to look at an animated diagram of a loudspeaker system. Raymond Cooke (KEG Electronics) and Nick Heap discuss the company's approach to loud speaker design. Cooke points to a diagram as he talks. Nick Heap, with circuit testing equipment and a computer VDU, demonstrates what is meant by impulse testing. Raymond Cooke and Nick Heap continue their discussion on the design of high performance loudspeakers. |
| Master spool number: | OU 3382 |
| Production number: | FOUT055T |
| Videofinder number: | 2648 |
| Available to public: | no |
