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The car back-up alarm (2)

2017-01-15 11:36  
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The car back-up alarm (2)
The working principle of the circuit The car back-up alarm consists of the sound alarm circuit and op-amp output circuit, see as figure 7-122. The sound alarm circuit consists of the switch S, resistors of R1 and R2, capacitor C1, voltage stabilizing diode VS and 3-terminal sound alarm integrated circuit IC. The op-amp output circuit consists of the power amplifier integrated circuit IC2, capacitors C2-C5, resistor R3 and loudspeaker BL.