| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an information processor which can control the sound volume of a piezoelectric buzzer and can be manufactured at a low cost. <P>SOLUTION: As a control circuit for the piezoelectric buzzer 21, the information processor uses a circuit comprising a resistor R0 having terminals connected to a power-supply terminal of the piezoelectric buzzer 21 as a terminal connected to a power source and a control terminal as the other terminal, two (or one or three or more) resistors R1 and R2 for sound volume control each having one terminal connected to the control terminal of the piezoelectric buzzer 21, and a transistor 23 which grounds the control terminal of the piezoelectric buzzer 21 only when an input control signal has a high level. <P>COPYRIGHT: (C)2009,JPO&INPIT |
