Verbal reversing alarm circuit (2)

When the car is reversing, this circuit can emit a verbal alarm sound of "Please note, reverse!..." to help the driver reverse the car safely.
    as the picture shows. The S circuit power switch
  is installed next to the driver. It
  works when the circuit is closed when reversing. VD1~VD4 are power supply polarity conversion
  circuits . When A and B are connected to the 12V power
  supply circuit regardless of direction, point C can be guaranteed to be
  +12V. IC is a ROM type voice chip circuit.
  When it is powered on, it can continuously output the voice signal of "Please pay attention.
  Reverse !". Island, c2 are
  the oscillation components of Icl, R, and vs provide 3V DC power for it.
  ④ The audio signal output by the pin is sent to the ③ pin of the amplifier circuit 1C2 through the coupling capacitor
  G. After amplification,
  it is output by the ⑤ pin of the LM386. Through the output coupling capacitor G, it is sent to
  the speaker BI. Sound the alarm.
  The model of IC1 is FHC5209, VS uses a 3V voltage regulator tube, and the speakers can also be 4TL or 16FL.