—– I. Ultrasonic Alarm System “II. Photoelectric Alarms “III. Passive Infra-Red Alarms “IV. Microwave Systems
Part 1 is an introduction to the various types of alarms in use today. “So we will discuss the circuits that guard a building’s perimeter. “Therefore, they are used primarily on doors and windows.
MANY PEOPLE THAT TRAVEL CARRY A POCKET ALARM WITH THEM. THIS ALARM IS A “SMALL DEVICE THAT IS HUNG AROUND THE DOOR KNOB, AND WHEN SOMEONE TOUCHES THE “KNOB HIS BODY CAPACITANCE SETS OFF THE ALARM.
—– I. Ultrasonic Alarm System “II. Photoelectric Alarms “III. Passive Infra-Red Alarms “IV. Microwave Systems
Cameras discourage everyone from doing things they would ordinarily do. “Stealing, breaking and entering, robbing, or anything else you can think “of. Cameras are everywhere, you just have to know the right time and the “right place you want to do the things you want to do. This file will “explain what you want to look for and where.
The big secret of lockpicking is that it’s easy. Anyone can learn how to pick locks with this huge handbook.
