Ditulis Oleh : YK69 Elektro
Judul : Rangkaian ALarm|Sirine Berbasis SCR
Rangkaian ALarm|Sirine Berbasis SCR
This is a simple SCR based burglar alarm circuit. Its features include automatic Exit and Entry delays - together with a timed Bell cut-off and Reset. It's designed to be used with the usual types of normally-closed input devices such as - magnetic-reed contacts - micro switches - foil tape - and PIRs.
SCR-based alarm circuit is It's easy to use. When you switch on the alarm - you have about 30 seconds to leave the building. When you return and open the door - the Buzzer will sound. You have about 30 seconds to switch off the alarm. If you fail to do so - the Siren will sound.
After about 10 minutes - the alarm will attempt to reset itself. If the trigger circuit has been restored - the attempt will be successful. But - if the loop is still open - the attempt will fail - and the alarm will re-activate. Of course - you can turn the Siren off at any time by switching off the alarm.
A conventional bell uses up to about 400mA. An electronic siren generally uses less. If you intend to draw a heavier current from either the Buzzer or Siren terminals - the SCR in question will need to be bolted to a metal heatsink - and the relay contacts may need upgrading.
If you do not want the timed "cut-off and reset" feature - leave out D5, D6, R11, R12, Q3, Q4, C6 and the relay.
Source
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