555 multi-function analog audio circuit

Published:2011/6/15 6:45:00 Author:TaoXi | Keyword: 555, multi-function, analog, audio | From:SeekIC

As the figure 14-27 shows, the multivibrator which is composed of two bipolar type 555s (or a 556) and the capacitance resistance elements can form a variety kinds of analog audio circuits. The oscillation frequency of IC1 is about 1Hz, the duty ratio is about 80%. The oscillation frequency of IC2 is about 1500Hz. By using the opening and closing of the switch, this circuit can simulate different sounds. For example, when you just turn on the K1, the IC1 starts working, the circuit will send out the monotonous second signal; if you just turn on the K4, the IC2 starts working, the circuit will send out the 1500Hz alarm signal; if you turn on the K3 and K4 at the same time, you can realize the modulation of IC1 to IC2, the circuit will send out the intermittently sound.



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