555 electronic timing, hypnosis and massager circuit

Published:2011/5/23 21:12:00 Author:TaoXi | Keyword: electronic, timing, hypnosis, massager | From:SeekIC

As the figure 16-2 shows, the monostable timing circuit is composed of the IC1 and R1，RP1，C1, An is the timing start-up button, if you press AN, the 555 circuit sets, pin-3 has the high electrical level, and the timing begins. The timing time td=1.1(R1+RP1)C1, the corresponding timing time of the figure parameters is between 10 to 60 minutes, and it is adjustable. The astable multivibrator is composed of the IC2 and R3，RP2，C3, the oscillation frequency f=1.44/(R3+RP2)C3, the figure parameters' oscillation frequency is 0.7-10Hz, you can adjust it by RP2, during the IC1's timing time, this circuit sends out the voice of raindrop to encourage people to sleep, when the timing time is up, it automatically stops the sound.



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