•  
  •  

Timed Burglar Alarm

Contributed by, Richard Johnson

N/O – N/C Timed Burglar Alarm

This is a simple but effective alarm circuit which can reset its self after a time that you select. it has normally open and normally closed triggers which make this circuit very practical. This alarm has normally open and normally closed triggers. It’s on a 555 timer so the alarm will reset it’s self after a certain amount of time. The time is adjustable with the variable resistor in the circuit. The alarm has a reset switch which you can replace with a key switch to make it more secure, and you can change the triggers to other types of door or window switched too. The alarm uses a relay which is connected to a siren but you can replace the siren with whatever you want. The circuit is running off 9VOLTS but can range from 4V – 16V.

If there are any problems please contact webmaster@electronic-circuits-diagrams.com

Please share & like

Allen Bradley 1769-IT6 1769-1T6 A Compact IO Input Thermocouple Module 1 CJC #3
$249.0 Allen Bradley 1769-IT6 1769-1T6 A Compact IO Input Thermocouple Module 1 CJC #3 picture
Panel Mount K Type Thermocouple Miniature Socket Plug Connector Yellow 1 Set
$10.18 Panel Mount K Type Thermocouple Miniature Socket Plug Connector Yellow 1 Set picture
Alloy One Set K Type Thermocouple Miniature Socket+Panel Mount Plug Connector
$10.18 Alloy One Set K Type Thermocouple Miniature Socket+Panel Mount Plug Connector picture
K Type Thermocouple Miniature Socket Plug Connector Yellow Alloy Mini Accs
$10.18 K Type Thermocouple Miniature Socket Plug Connector Yellow Alloy Mini Accs picture
New Fluke 80pk-8 Type K Thermocouple Pipe Clamp Temperature Probe, Excellent
$152.99 New Fluke 80pk-8 Type K Thermocouple Pipe Clamp Temperature Probe, Excellent picture