The ultrasonic back-up crashproof alarm (2)

Published:2011/7/22 22:45:00 Author:qqtang | Keyword: ultrasonic, crashproof alarm | From:SeekIC

The working principle of the circuit The ultrasonic back-up crashproof alarm consists of the power supply circuit, ultrasonic emitting circuit, trigger circuit, low frequency oscillator, counter, ultrasonic reception process circuit and alarm circuit, see as figure 7-108. The power supply circuit consist of the 3-terminal regulator integrated circuit IC6 and filter capacitors of C4 and C5.The ultrasonic emitting circuit consists of the emitter BI, the NOR gates D1-D4 inside the integrated circuit lC1(DI-D6), resistors of R1 and R2, resistor C1 and so on.



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