The circuit shown in Figure 12.9.1 can be used to listen to the radio, enjoy music, and bring good news to insomniacs. When receiving the radio, it has a high sensitivity and selectivity. If it is placed in a hypnotic state, the earphone will emit a "tick, tick..." sound similar to the dripping sound of the eaves on a rainy day, which can stabilize people's emotions and make them sleepy.
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