This is security alarm circuit which can be used in Motorcycle or Car, after you turn on the power to board. Board will monitor voltage of 12VDC battery, once start system start , board will detect voltage drop , and count 10s then Relay will turn on the Siren alarm. In 10s , you have to turn off the power to board to prevent Siren alarm.

Technical information:
   - 12VDC Supply from car battery or Motorcycles. ( check that it use 12VDC , not 6VDC )
   - Relay 12V DC,  max 240VAC 10A
   - Current consume 50mA
   - Alarm on 1 minutes
   - Variable pot to adjust the sensitivity to detect voltage.
   - PCB size 2.27" x 1.70"

Download User Manual