G - Physics – 04 – C
Patent
G - Physics
04
C
G04C 21/28 (2006.01) G04G 13/02 (2006.01) G10H 1/057 (2006.01)
Patent
CA 2186069
This sound generator comprises a transducer (3) intended to be supplied with a signal having a frequency determining the sound to be produced and having a variable amplitude (envelope). To this effect, the transducer is connected in series with the principal path of a semiconductor component (5). The control electrode of this semiconductor component (5) is connected to a RC-circuit (1,7) capable of providing control pulse trains having said envelope. According to the invention, the RC-circuit comprises a capacitor (7) and at least one input branch (13) of a current mirror (11) the output branch (12) of which supplies a control electrode of the semiconductor component (5). Preferably, the capacitor (7) is connected in series with the input branch (13). Application in particular to wrist-watches equipped with an audible alarm.
Eta Sa Fabriques D'ebauches
Gowling Lafleur Henderson Llp
LandOfFree
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