Electronic Metronome Circuit with 555

This metronome circuit is not modern but is cheap and reliable. The well known 555 is connected as an astable multivibratos in this electronic metronome and produces a regular train of impulses which can be heard with a speaker. The metronome frequency can be adjusted with P1. The power supply is a 9V battery and if you use a speaker with an impedance of less than 8Ω insert a 33 to 100Ω/1W resistor in series.

555 Metronome Circuit Schematic


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  • florian silver

    Dear Mr. Popescu; I have assembled the metronome circuit several times and it did not work. Two 555 manufacturers websites (ON Semiconductor and National Semiconductor) propose circuits that differ from yours in that pins 2/6/7 are not joined together but there is a resistor Ra between +Vcc and pin 7, a resistor Rb between pin 7 and pin 6 (= pin 2) and the capacitor is between pin 6 and ground. The output frequency is f=1.44/C[Ra+2Rb].Both manufacturers ask for a 0.01μf capacitor between pin 5 and ground. It would have been helpful to specify the maximum power rating of the loudspeaker. The sound level I am getting is quite low and am trying to use an LM386 audio amplifier. Any suggestion? Mulṱumiri

  • sandy

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