Thursday, June 2, 2011

Touch Alarm System

Touch Alarm circuit is widely used for security, which is installed on the door. The advantages of this alarm is because the cost is cheap and difficult to detect by burglars / intruders. The following is an example of a touch of alarm circuit which is designed by Tony Van Roon.
touch alarm system
Components List:
R1 = 100K
R2 = 56K
R3 = 10M
R4 = 220K
P1 = 100K
D1 = 1N4004
T1 = 2N3904, or equivalent
U1 = 555 Timer*
C1 = 47μF/16V**
C2 = 33μF/16V**
Re1 = Relay***
*The 555 can be a LM, NE, or MC(cmos) type, they’re all pin-compatible.

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