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ben9

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  1. Hi, I'm from Colombia, actually, I'm a musician. I built a metronome using a 555 timer, and I'am very satisfied with the results. It works with a 12V DC supply, and works very well with batteries. The frequency of each beat is perfect, even when I use lower voltages. (I have tested it with 3.0 to 12V). For example, when I set it for 40 Beats Per Minute, every beat will be each 1500 milliseconds. (actually, it´s not digital, so I use a potentiometer to set the TEMPO). Nice. but I use the metronome with a Transformer or adaptor, conecting to an AC line, and I've found that there are some variatios in the period of each beat. for example: Setting it for 40 BPM, a beat can be at 1520 milliseconds, the otherone at 1505, etc. I mean, there is a variation in the period or frecuency. I think this happens because the DC out is not "CLEAN" I mean the AC is not well rectified. I installed an Electrolitic Capacitor of 2200uf after the bridge rectifier, and I got a little improvement. I installed a ceramic capacitor (0.01uf) between pins 1 and 8 (555's voltage supply) and another between pin 5 and ground, in order to get more stability. How can I to reduce this variation? how can I to get a better rectified DC output?. Thanks (please, excuse my english). have a happy new year!!!
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