PIEZO BUZZER INSIDE




Circuit
Piezeo electric crystal based buzzer circuit

Program (Arduino -for 20KHz)

void setup() {
 pinMode(13,OUTPUT);
}

void loop() {
digitalWrite(13,HIGH);
delayMicroseconds(10);
digitalWrite(13,LOW);
delayMicroseconds(12);
}
Waveforms
(Note : attenuation probe *10 used)

voltage wave form across piezeo electric crystal (40v ,Cout =0.1uF , f=4.7KHz)

voltage wave form across piezeo electric crystal (50v  ,Cout =0.01uF , f=4.7KHz)


voltage wave form across piezeo electric crystal (52v  ,Cout=220pF, f=4.7KHz)

voltage wave form across piezeo electric crystal (28v  ,Cout =0.01uF , f=20KHz)