AUTOMATION FOR DOOR ALARM: ALARM
ALARM DESIGN: AUTOMATION FOR DOOR BELL
When the door is open, the device is triggered during a short period and activates the buzzer connected to it.
When the door is closed, the device between tonction again by pressing the ringer for a while. The supply voltage must be 12 Volt DC The maximum consumption is about 70 mA with relay excites and only 3 mA rest. To change the relay excitation time (duration of the ring), we must act on the value of the capacity C2. By increasing this value, the time increases and vice versa. For assembly of components and connections, we must be attentive to the implementation of the scheme indications.
LIST OF ELECTRONIC COMPONENTS: All resistors are of 1/4 watt unless statedotherwise. R = 4,7Kohms R2 = 33Kohms Cl = 10uF16Velec. C2 = 470uF16Velec. IC1 = 40106B RL = relaisl2V 1 magnetic reed switch 1 Support 14 pin