Alarm home schematics - Circuit draws only a few micro amps from a 9 volt battery !

Alarms produce different sounds based on its applications. Suppose if we use in home, it is very helpful to be used under various places. These schematics of usage are referred as alarm home schematics . Some of alarm home schematics used over here are Electric Field Disturbance Monitor, Doorknob Alarm, Freezer Over-Temperature Alarm, Doorknob Proximity Alarm, Fire Alarm and alarm for GPS Tracking System.

Home alarm schematics play a role in various fields. Electric Field Disturbance Monitor schematic is the power supply and front end sections of the field monitor. The system can detect human and animal motion by the electric fields they disturb.

Doorknob Alarm is used in many companies. It is a simple alarm device for personal use in bedrooms or hotel rooms. A metal chain attached to a box holding the electronics is placed around the inside doorknob of a wooden door. This circuit schematic would dramatically reduce the cost of the device and allows it to operate for many years from one set of batteries.

In Freezer Over-Temperature Alarm, the circuit turns on a beeper whenever the inside temperature of a freezer is greater then zero degrees Centigrade. The circuit draws only a few micro amps from a 9 volt battery. It uses a glass bead thermistor. In Freezing Temperature Alarm, the circuit turns on a beeper whenever the outside air temperature is less than zero degrees Centigrade. The circuit draws only a few micro amps from a 9 volt battery. It uses a glass bead thermistor. The circuit warns the user against fire accidents is Fire Alarm. This causes the resistance of LDR to increase and the voltage at the base of the transistor is pulled high due to which the supply to the COB is completed.