Call for help alarm circuit
Source: InternetPublisher:已注销 Keywords: Alarm circuit oscillator Updated: 2021/01/08
Shown is a simple call for help alarm circuit . The circuit is mainly an audio oscillator composed of NE555 integrated circuit . The power supply of the oscillator is controlled by
the thyristor VT . When the control key Ki is operated , the trigger signal causes the VT to conduct and oscillate . The device is powered to work and drives
the speaker to produce sound to attract the attention of people around you.
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