Sunday, May 26, 2013

Simple door Alarm circuit

This is simple door alarm circuit.You can attach this circuit for your for your main door If somebody opens it alarm will activate.Sw1 is a Read switch.Those switches are operated with magnets.
Parts:

Q1 = BC547
Q2 = BC327
B1 = 3V Battery
R1 = 330K
R2 = 100R
C1 = 10nF-63V
C2 = 100uF-25V
SW1 = Read Switch



Note

# Dont supply more than 4.5V for this circuit

#Attach a magnet for the door frame near by the read switch