Moderate rhythmic sounds help to calm the mind, calm the nerves, and relax the brain, making it easy to fall asleep.
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The illuminating electronic hypnosis circuit introduced in this paper uses the function of electrons to emit a "squeaky" raindrop sound. The hypnotic effect is very good. It has a simple structure and is easy to take, especially suitable for amateurs.
working principle
The local circuit is shown in Figure 12.7.1. BG1 is a single junction transistor which forms a chirped oscillator with W1, R1 and capacitor C. Where W1, R1 and C oscillate
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