circuit also depends on the operating voltage at high voltage the sound will be high and at low voltage it will be low.
The circuit is built using four 555 timer ICs, each of them are performing a different task in the circuit. You can also use two NE556 timer ICs in the place of four 555 timers. The light sensitivity of the circuit can be adjusted with 20K variable resistor. The speed of bird chirping can be adjusted with the 10K variable resistor. By adjusting the 50K variable resistor you can set the desired sound of the bird.
An 8 ohms 0.2 watt speaker is used at the output of the circuit. You can also use other wattage 8 ohms speakers like 0.5 watt, 1watt, 2watt etc. The operating voltage of the circuit is 5V to 12V DC.
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The figure below shows a very interesting project of a Morning bird using 555 ICs. The circuit will automatically generates bird sound when the sun rises or any light falls on the surface of the LDR. The circuit can be used as a morning or light activated chime or as a fun project. The output sound of the circuit is quit loud and can be heard in whole house. The output sound of the
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