The present invention relates to a reverse radar with vehicle approaching
alarm comprising a main body and sensors, in which the main body
comprises a CPU circuit, an operational amplifier circuit, a switching
circuit, a signal transmitting-receiving circuit, a detecting circuit and
a power source, and the input terminals of the CPU circuit are connected
to the output terminals of the operational amplifier circuit, the
detecting circuit and the power source, and the output terminal of the
CPU circuit is connected to the input terminal of the switching circuit,
and the input terminal of the operational amplifier circuit is connected
to the output terminal of the switching circuit, and the switching
circuit and the signal transmitting-receiving circuit are interconnected,
and the output terminals of the power source are connected to the input
terminals of the switching circuit and the signal transmitting-receiving
circuit, and the main body further comprises an alarming source which
gives a warning signal when another vehicle approaches and a controlling
circuit which controls the alarming source, and the controlling circuit
is connected to the output terminal of the CPU circuit and the power
source. The structure of the present invention is simple. When the
vehicle is parked in a car park and the driver is not present, the
present invention can give a warning signal to alert the approaching
vehicle so as to prevent accident.