Build your own home security system
Describes the basic components of a home security system, including sensors and sounding devices, tells how to install an intrusion detection system, and discusses car security, advanced security systems, fire alarms, and environmental sensors
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25 V electrolytic 555 timer IC ac power alarm circuit alarm of Fig alarm sounding device applications battery bugging burglar alarm burglar alarm system chip circuitry combination lock connection cuit detected diode door DPDT electrical electrolytic capacitor electronic combination lock equipment foil tape frequency given in Table input intruder key switch kQ A W light level list for project load magnetic reed switch mercury switch momentary-action monitored nand gate normally closed switch normally open switch NPN transistor photoresistor photosensor photovoltaic cell piezoelectric piezoelectric buzzer potential potentiometer potentiometer R2 power supply project is given protected area pulse radar detector Radio Shack relay coil reset resistance resistor R3 schematic security system sensor circuit sensor switch shown in Fig signal simple smoke detector SPDT suitable parts list supply voltage switch contacts switch S1 timer transistor Q1 transistor Radio Shack trigger trimpot window wire