The following figure shows the schematic circuit diagram of an electric police car toy. In the figure, VT1 is an integrated infrared receiver, which emits infrared rays from a diode and receives it from a triode. IC1 (NE556) is a dual time-base integrated block. It consists of R5, R6 and C5. It oscillates an oscillation circuit with an oscillation frequency of about 1 200 Hz. It drives the infrared emitting diode through 5 feet to emit modulated infrared light. The infrared receiving diode and R1, C1, R2 and VT2 form an infrared receiving, photoelectric conversion and pulse trigger circuit.
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