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An expandable scr based burglar alarm circuit diagram and instructions infrared ir security using 555 timer ic lm358 pir sensor light switch heat its working principle wire break schematic system applications energies free full text operational analysis of fire systems with a foc disd mixed structure in critical infrastructure buildings motion detector door opening hall detailed project available how to build laser the metal source scientific simple reliable touch sensitive unit make basic circuits control physics astronomy topics for gas audible thermistor laptop anti theft pdf contents hide kiran walke academia edu mukul vaishnav liquid page 3 sensors detectors next gr 5 homemade projects rain bc547 transistor s no 1 2 4 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 cd4017 electroduino types example logic category freak engineer proximity alarms related schematics tutorials electronics hobby i n under repository 41201 diy intruder opamp gadgetronicx dark template construction co monitoring ventilation typical wiring zeta ltd