555 multi-stage electronic metronome circuit

Published:2011/6/15 7:02:00 Author:TaoXi | Keyword: 555, multi-stage, electronic metronome | From:SeekIC

As the figure 14-39 shows, in this circuit the 555 is used as the astable multivibrator. The circuit beat is divided into three stages to be controlled, the oscillation frequency f1=1.44/(R1+RP1)C1, it is about 20-60 beats/min; f2=1.44/(R1+RP1)C2, it is about 60-80 beats/min; f3=1.44/(R1+RP1)C3, it is about 180-540 beats/min; after you know the calculation formula, you can change the charging and discharging time constant RC by yourself according to the actual situation to adjust the frequency or the beat. Also you can increase or decrease the number of stages. In order to make the beat more accurate and the parameters more stable, you need to use the metal film RJ as the resistance, and the electrolytic capacitor need to have the features of small leakage of electricity and high voltage capacitance.



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