| 摘要 |
<p>The invention relates to a simple delay alarm, comprising a body, a hook, a battery, a power switch, a printed circuit board, a sound IC, an angle displacement switch and a speaker, and there is an electrode at one side of the pendulum of angle displacement switch, and a reset electrode at the other side, the trigger of sound IC is connected to a delay circuit including a capacitor. The invention uses a general capacitor which can be charged and discharged, and makes alarm through the charging and discharging of the capacitor, and it can avoid the wrong alarm, and be used by various users in various circumstances, and make sure the best effect to prevent the short sight and crookback.</p> |
