| 摘要 |
PURPOSE:To discrminate the operation state of a receiving circuit by incorporating the receiving circuit in a timepiece and displaying the operation state of the receiving circuit. CONSTITUTION:Every time a push botton SW is pressed, the output signal of a flip-flop circuit 2 is alternately changed when the output signal is a 1, a display element 3 is turned on and when a 0, it is turned off. At the same time, when the output signal is the 1, a transistor TR turns on and a power supply of a receiving circuit 4 turns on to generate a sound through a speaker 7. When the signal is the 0, the power supply of the receiving circuit 4 turns off. When a transmitter 6 and a receiver 5 are at constant distance, the receiving circuit 4 applies the speaker 7 with an enough voltage for sounding. |
