| 摘要 |
PROBLEM TO BE SOLVED: To easily light an illuminator when the surroundings are dark by constituting an illuminator which automatically lights by the situation of lightness of the surroundings and the production of sound. SOLUTION: A transistor 12 is connected in parallel with a switch 3 of an illuminator composed of a battery 1, a bulb 2, and the switch 3. The output voltage of the battery 1 is inputted, being divided by a photodetection sensor 3 and a resistor 5, to an IC 6, and since the photodetection sensor 4 is large in resistance value when light does not enter, the input voltage of IC 6 goes down to low level, and output voltage of the IC6 goes up to high level. When sound is inputted into a sound detection sensor 7, it is amplified with an amplifying circuit 8, and a timer circuit 11 with a capacitor 9, a diode 10, and an AND circuit 13 is started by the rising of the signal after amplification and the output goes up to high level for a certain time. By putting it in such constitution, the transistor 12 is turned on by producing a sound when the surroundings are dark, and the light 2 can be lit. |
