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Mini Metronome by 555 Timer/Oscillator IC

2015-01-29 18:55  
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Figure 1 

This mini metronome gives a linear scaled output and 40 to 208 beats per minute.

1- Q1 and Q2 transistors provide linear frequency variation of IC1 depending on the changes of P1 value. 2- Q3 amplifies the click sound output and gives louder beats. 3- To provide a higher output , a 12V micro battery is used. It also makes the circuitry more compact. 4- Rotate the P1 potentiometer fully towards R2, then set R1 to obtain 40 beats per minute by the help of another metronome.

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Figure 2 

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