resistor in the place of pot. But adjusting the beats will be easier with pot. The circuit is built around the popular 555 timer IC which is used as an astable multivibrator here. The circuit can be powered with any voltage from 9 volt to 12 volt DC. You can also use a small 9 volt battery to power the circuit.
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The figure shows an easy project / schematic of a metronome circuit. A metronome is a device that is used by musicians. The circuit produces continues beats in the speaker. The number of beats per minute can be adjusted with the help of the 500K pot. You can also use a small 500K variable
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