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Consumer Electronics by S. P. Bali

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CRYSTAL LOUDSPEAKERS

Rochelle-salt crystals have the property of becoming physically distorted when a voltage is applied across two of their surfaces. This property is the basis of the crystal type of speaker driver, illustrated in Fig. 4.2.

 

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Fig. 4.2 Schematic representation for a crystal type speaker

 

The crystal is clamped between two electrodes across which the audio frequency output voltage is applied. The crystal is also mechanically connected to a diaphragm. The deformations of the crystal caused by the audio frequency signal across the electrodes cause the diaphragm to vibrate and thus to produce sound output.

Crystal speakers have ...

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