| 摘要 |
PURPOSE:To prevent a cold caught during sleep by generating an alarm sound when room temperature became a set value or less. CONSTITUTION:When temperature falls, and the internal resistance of a thermister 2 becomes high, input voltage of a differential amplifier 3 becomes high and if it becomes plus as compared with the voltage of B, a transistor turns ON, thereby allowing a warning sound generator 6 to be actuated. |
