Page 73 - Electronics Starter Kit_EN
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Wiring diagram
18.5 Circuit Explanation
In this circuit we connected the pins 4 and 8 to 5V (it is okay if we did not connect pin 4), we
connected pin 5 to a 100nF capacitor to remove the noise through it to GND if exists (it is okay if
we remove it), pin 1 to GND, pin 3 to the Active Buzzer, to understand how this circuit works,let
us suppose that C1 is empty, so the voltage on pin 2 is almost zero, the Buzzer will makes a
sound, when the output is high, pin 7 will be almost 5V on it, so C1 will start to charge through
R2 because it is lower than R1, so the current will prefer it.
When the capacitor gets charged the voltage on pin 2 will be high, so the output will be zero, the
Buzzer will turn OFF, and pin 7 will be 0V so the capacitor will discharge through R1, even
though it is bigger than R2 but the diode will block the current.
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Electronics Starter Kit r.00 www.plusivo.com
