555 intermittent single tone audio circuit

Published:2011/6/15 21:25:00 Author:TaoXi | Keyword: 555, intermittent single tone, audio | From:SeekIC

As the figure 14-30 shows, this circuit is composed of three 555 circuits, the first stage of 555 forms a monostable trigger. In peacetime, the input port A has the high electrical level, only when the negative pulse arrives, the circuit state will change. The RC time constant can be adjusted by itself. The second stage of 555 forms the multivibrator, the oscillation frequency of the figure parameter is 1Hz～10Hz, you can change it by adjusting RP2. The third stage of 555 is the multivibrator with the oscillation frequency of 1000Hz, it is controlled by the square wave. This circuit uses the double time base 555 circuit, because the drive current is large (about 200mA), so the current can drive the speaker directly.



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