The core component of this circuit is the 555 integrated timer. It works in an astable mode. After the power is turned on, the level of pin 3 of the output terminal of the 555 integrated timer continuously changes between high and low levels. When pin 3 is high, Normally, LED1 goes out, LED2 emits light, and capacitor C3 is charged at the same time, and the speaker makes a "click" sound; when pin 3 is low level, LED1 emits light, LED2 goes out, and capacitor C3 discharges through the speaker, and the speaker makes a "click" sound again. . So the light-emitting diodes light up alternately, and the speaker makes a "click-click" beat sound. The working voltage can be between 3v-5v.
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