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.
Components List:
Notes:
*The 555 can be a LM, NE, or MC(cmos) type, they’re all pin-compatible.
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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