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Return to BlogMini Metronome by 555 Timer/Oscillator IC
Posted Jan 24, 2012 at 9:11 am
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.
Figure 2
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2 years ago: sorry, but what does a metronome do exactly?
2 years ago: what was the role of the 555 timer in this circuit? do we have any alternative for the 555 timer?
2 years ago: I have built this circuit for a while now I am testing it. Instead of using lm555, I am using LM556cn. Basically they are the same and I am using different PNP transistors as you suggested but the circuit I built does not work. Of course I have to use the each pin of LM556 correctly with each its pin function