NotesFAQContact Us
Search Tips
Peer reviewed Peer reviewed
Direct linkDirect link
ERIC Number: EJ880931
Record Type: Journal
Publication Date: 2010-May
Pages: 11
Abstractor: As Provided
ISSN: ISSN-0143-0807
Further Experiments with a Loudspeaker
Kraftmakher, Yaakov
European Journal of Physics, v31 n3 p579-589 May 2010
A common moving-coil (dynamic) loudspeaker is a device very suitable for teaching the general features of oscillating systems. As an addition to a previous paper (Kraftmakher 2009), this paper includes the following topics: (i) a new design of the optical sensor for measuring the cone oscillations; (ii) positive feedback and self-excited oscillations; (iii) the determination of the loudspeaker parameters without direct measurements of the cone oscillations; and (iv) the loudspeaker in a vacuum chamber. The measurements are performed without a lock-in amplifier. The tight connection between the mechanical and electrical parameters of a loudspeaker is confirmed. The experiments are well related to the university courses of electricity and magnetism and can be used in undergraduate laboratories. (Contains 7 figures.)
Institute of Physics Publishing. The Public Ledger Building Suite 929, 150 South Independence Mall West, Philadelphia, PA 19106. Tel: 215-627-0880; Fax: 215-627-0879; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A