This is a 555 timer IC based fun circuit which generates a Tic Tic sound. It is quite simple circuit designed by wiring the 555 IC in astable mode.
- 555 Timer IC
- Capacitors – 2x 10µF
- Resistors – 47k ohm
- 8 ohm Speaker
- 9v Battery
- Breadboard and connecting wires
Ticking sound circuit is a good example of Astable mode of 555 timer IC similar to Dark Detector Circuit. Here we are using a speaker which is used to convert electrical signal into sound. We are not using discharge PIN 7, and we have connected capacitor C2 to the OUTPUT PIN 3 of the 555 IC. Generally, we used to connect the Capacitor to the voltage source, through resistors, but here we are connecting capacitor C2 directly to the OUPUT PIN 3, through a 47k ohm resistor. Capacitor will be charged through the output at PIN 3, when output PIN 3 will be HIGH. And capacitor C2 will be discharged to the Speaker when PIN 3 is LOW. When capacitor charge and discharge, speaker produce the tic tic sound.