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        Multifunction adjustable power supply
        

        2017/12/25??????view: 
        

        

        
	

        
NE555 is used to generate pulse signal circuit. By adjusting NE555's 2 and 6 pin to the ground capacitor, it can change the frequency of signal output. Generally, the output frequency is regulated by adjusting potentiometer R5, and the output frequency is output through P3 terminal. The buzzer and Q1 make up the buzzer circuit. It is used to detect pulse signals. The pulse signal is input from the P4 end.