Simple Timer Electronic Hypnosis And: Traditional Chinese Circuit Desi

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In short: Traditional Chinese Simple timer electronic hypnosis and doorbell dual-purpose device: Circuit Design, Parts List & Workshop Prototype Guide. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 2776 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.

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Simple timer electronic hypnosis and doorbell dual-purpose devicePractice has proven that moderate rhythmic sound can stabilize emotions, calm nerves, and put people's brain in a relaxed state, so it has a certain hypnotic effect. Based on this principle, a timed electronic hypnosis device as shown in Figure 88 can be made.The circuit consists of two parts. Transistors VT1, VT2, C1, etc. form a timer; VT3 and VT4 form an asymmetric multivibrator. When button SB is pressed, all the power supply voltage is applied to both ends of capacitor C1, and C1 is quickly fully charged. At the same time, the power supply provides base bias current to VT1 through RP1 and R1, and the composite switch tube connected by VT1 and VT2 is saturated and turned on. Therefore, the left end of the resistor R3 is connected to the ground through the isolation diode VD, so that VT3 obtains a base bias current. …

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