Electronic hypnotic device 5

Published:2011/4/26 6:15:00 Author:Ecco | Keyword: Electronic , hypnotic device | From:SeekIC

The working principle. The electronic hypnotic device is composed of monostable circuit, self-excited multivibrator circuit and buzzer HA and other components, it is shown in Figure 9-142. Monostable circuit is composed of dual D flip-flop integrated circuit IC (Al, A2) and resistors Rl-R4, capacitor Cl, control button 51 and delay time selection switch 52. Self-excited multivibrator circuit is composed of the other D flip-flop A2 inside the IC and diodes VDl-VD4, resistors R5, R6, capacitors C2, C3. Pressing button S1, the flip is triggered by the monostable circuit, IC's Ql outputs high level, the multi-harmonic oscillator works, the Q2 of IC outputs 2Hz oscillation frequency signal, the driver HA issues a similar sound of raindrops to help people sleep. When the charging of Cl is over, one-shot circuit returns to steady state, IC's Ql outputs low level again, multi-harmonic oscillator stops working, HA stops the sound.



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