Electronic Metronome. Using a 555 Timer. LM 555 Timer Chip. Used in a wide variety of circuits to generate square wave and triangular shaped single and periodic pulses. High efficiency LED and fluorescence light dimmers Temperature control loop for electric stoves. Multivibrators.
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Using a 555 Timer
When the output of the 555 timer changes from 5V to 0V, a pulse current will flow through the speaker, causing the speaker to create a sound. You will change the frequency of the pulses to the speaker by changing the value of Ra. Since Ra is usually much larger than Rb, the frequency of the pulses are linearly proportional to the value of Raand the duty cycle of the pulse waveform will be very short.