Using a 555 timer circuit and a few electronic components can be made very simple metronome. Timer 555 circuit is connected to circuit as a astabil multivibrator and produces regular pulses that can be heard in a speaker. Metronome pulse frequency can be adjusted with the 220k potentiometer. The circuit requires a supply voltage of 9 volts DC power supply( can be used and a battery). If is used a speaker with an impedance of 8 ohms must be connected a series resistance of 1 watt.