555 baby wave bed automatic sloshing circuit

Published:2011/6/7 8:39:00 Author:TaoXi | Keyword: 555, baby wave bed, automatic, sloshing | From:SeekIC

As the figure 15-34 shows, the circuit is composed of the pickup, the timer, the oscillator and the drive device, it can be used to automaticly shake the bed when the baby is crying. The pickup B changes the baby cry into the electrical signal, and this signal is amplified and rectified by VT1 to conduct the VT2, C4 discharges and IC1(555) sets, pin-3 has the high electrical level, the timing begins. The timing time td=1.1R4C4, the figure parameters' timing time is about 6 minutes. In the timing time, VT3 conducts and the IC2 multivibrator gets power to work, the oscillation frequency f=1.44/(RP1+R5)C5, the figure parameters' oscillation frequency is in the range of 1 to 6Hz, and the oscillation frequency can be adjusted by RP1. The duty ratio of IC2 is 1:1.



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