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本文介绍一种采用“抓贼呀”语音集成电路制作的防盗报警器,有兴趣的读者不妨一试。 1.工作原理该报警器线路如附图所示。A1、A2是一片双单稳态触发器。A1用脉冲上升沿触发,触发脉冲从脚4输入,此时脚5要接高电平。A2用脉冲下降沿触发,触发脉冲从脚11输入,此时脚8要接低电平。S1为常开触点开关,S2为常开按钮开关。平时主人出门时,先合上开关S2,电路接通电源。电源经R1向电容C1充电。在C1两端电压还来不
This article introduces a “catch thief ah” voice integrated circuit anti-theft alarm system, interested readers may wish to give it a try. 1. The working principle of the alarm circuit as shown in the figure. A1, A2 is a dual monostable trigger. A1 is triggered by the rising edge of pulse. The trigger pulse is input from pin 4, then pin 5 should be connected to high level. A2 is triggered by the falling edge of the pulse. The trigger pulse is input from pin 11, and pin 8 should be connected to low level. S1 is normally open contact switch, S2 is normally open button switch. When the owner usually goes out, first close the switch S2, the circuit is connected to the power supply. Power is charged to capacitor C1 via R1. The voltage across C1 is not yet