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Touch Alarm Circuit

When signal came from touch sensor 555 send a pulse to transistor wich activate relay(RELE)

Touch Alarm Schematic

touch alarm PCB

Components

  • R1-100K
  • R2-4K7
  • R3-10M
  • R4- *SEE NOTE
  • R5- *SEE NOTE
  • P1-100K
  • D1-1N4148
  • LED1-LED2 - 3mm
  • C1-47uF
  • IC1-555
  • T1-2N2222 or 2N3904
  • RELE 6V-12V
*NOTE IF VOLTAGE =9V R4-390 R5-390 IF VOLTAGE =12V R4-1K R5-1K