Security Circuits

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Telephone Line optical and sound Ring
Three phase tester
Signal Conditioner
Fire Alarm Circuit using LDR (Light Depending Resistor)
mains voltage monitor
low current relay circuit
MSF detector - turning the radio signal into data
Timed Burglar Alarm N/O - N/C
Mains Manager
GSM Remote Control Gate Control Schematic
clock-synchronised multiplexers
ICL8038-based Oscillator