Touch alarm circuit (2)
Source: InternetPublisher:吃掉星星 Keywords: Alarm circuit touch type pulse Updated: 2020/12/19
Circuit working principle: This circuit consists of two 555 timer ICs. IC 1 is connected as
a monostable multivibrator. When the finger touches the contact plate,
a negative trigger pulse is added to the input terminal of pin 2 of IC 1 , and its pin 3 outputs a monostable positive pulse
. The duration of the positive pulse is t=1.1R2·C1.
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