555 Electronic Metronome Circuit

Posted on Feb 5, 2014

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

555 Electronic Metronome Circuit
Click here to download the full size of the above Circuit.

) 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. 01 f 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 Mula ±umiri

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