Pressed Button Sound Indicator

sing this electronic scheme can be made an electronic circuit that allows a sound indication for a button.The circuit is based on a 7555 integrated timer (CMOS version of the well-known ment 555) is connected as a multivibrator astabil .His output is a rectangular pulse with a frequency of 700 Hz, which is used to control a small buzzer.

Pressed Button Sound Indicator Schematic 

Pressed button sound indicator circuit 
The circuit will oscillate be prevented if pin 4 of integrated circuit is connected to 0 V.
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