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555 outburst audio circuit

2015-02-03 14:17  
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555 outburst audio circuit
As shown in the figure 11-20, the outburst audio circuit is composed of a monostable trigger circuit and a multivibrator, it can be made of a 556 integrated block and some resistor capacitor components, it is used in audio, alarming and so on. When a negative trigger pulse is added to IC1-1's trigger terminal 6 foot, IC1-1 rolls over and it is timed, td=1.1R1C1,the metastable time of graphical parameter is about 10s. The outputed high level pulse is added to IC1-2's reset terminal 10 foot, then IC1-2 starts to vibrate,the oscillation frequency f=1.44/(R2+2R3)C2. According to different occasions and needs, the audio frequency can be designed, after 10s, it stops automatically. This circuit also can be used to control the electrical equipments.