the circuit is very simple , it just uses a couple of resistors, a capacitor and the easily available 555 timer IC. The 555 is setup as an astable multivibrator operating at a frequency of about 1kHz that produces a shrill noise when switched on.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgELx08ODnZxQsTkozoQD9K8e2G4xYfMwr6eyuTfAVCQ9_TIcVqf0b0MeL6tugOW7n_e6wbtuAc3S1v5g7YdF6uD1bjO-84iOogDTtz39FSUh4lt14MwmVxlXR_L8gEmJ1KzUjMDiCJPBse/s400/A+Simple+Electronic+Buzzer+electronic.gif)
The frequency can be changed by varying the 10K resistor.
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