| 摘要 |
PURPOSE:To seek easily a remote control transmitter even if it is left somewhere, by generating sound from the transmitter by turning on a switch provided at a receiver. CONSTITUTION:In depressing a switch 4 provided to the receiver 1, a pulse generating circuit 2 and an RF modulating circuit 3 are turned on. Thus, a pulse is inputted from the circuit 2 to the circuit 3 and irradiated from an antenna 5 by being modulated. A pulse is received at an antenna 7 of a remote control transmitter 6 and inputted to a demodulating circuit 8, and the pulse modulated at the circuit 3 is restored and outputted to a timer circuit 9. The circuit 9 is turned on for a prescribed time by the pulse inputted from the circuit 8 to output a pulse whose level is decreased gradually to a buzzer tone generating circuit 11. The circuit 11 applies an output proportional to the level of the input pulse from the circuit 9 to a speaker 10. |
