| 摘要 |
PURPOSE: To reduce the number of parts of hardware of a piezoelectric buzzer drive control system driven by an electronic controller, with the number of stable vibration and a clear tone and easy for volume control in software. CONSTITUTION: A microprocessor core 1, a ROM 2, a RAM 3, a programable timer 4 with a voltage output terminal and a clock oscillator 5 are assembled in a general one chip type microprocessor. A buffer amplifier 6 inputs the output pulse wave of the microprocessor 4 and drives a piezoelectric buzzer 7 to protect a circuit in the microprocessor. A buzzer driving power source 8 is shared with a power source (normally 5V) for supplying to the microprocessor or made independent. |
