Why Install an Extra Relay for a Door Holder?

Fire Alarm Door Holder Wiring Diagram

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Fire Alarm Door Holder Wiring Diagram - blogmaygomes

Fire alarm door holder wiring diagram

Why install an extra relay for a door holder?

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Door Security Alarm Circuit for Alerting if Door was Opened - Homemade
Door Security Alarm Circuit for Alerting if Door was Opened - Homemade

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Thief/ Door alarm using a transistor - Gadgetronicx
Thief/ Door alarm using a transistor - Gadgetronicx

Door opening alarm circuit diagram
Door opening alarm circuit diagram

Transistor based Security Alarm
Transistor based Security Alarm

Electric Strike Wiring Diagram
Electric Strike Wiring Diagram

Fire Alarm Wiring Diagram | My Wiring DIagram
Fire Alarm Wiring Diagram | My Wiring DIagram

Burglar Alarm Project: Burglar Alarm Circuit Using Transistor
Burglar Alarm Project: Burglar Alarm Circuit Using Transistor

Fire Alarm Door Holder Wiring Diagram - blogmaygomes
Fire Alarm Door Holder Wiring Diagram - blogmaygomes

How to build A Simple Fire-Door Alarm - circuit diagram
How to build A Simple Fire-Door Alarm - circuit diagram

Fire Alarm Door Holder Wiring Diagram - blogmaygomes
Fire Alarm Door Holder Wiring Diagram - blogmaygomes

Why Install an Extra Relay for a Door Holder?
Why Install an Extra Relay for a Door Holder?

Infrared Security Alarm Using PhotoTransistor » Circuitspedia.com
Infrared Security Alarm Using PhotoTransistor » Circuitspedia.com