Hi,
I have made a simple circuit for a 12V door electric bolt from the below components:
1- 12V power supply
2- Door Electric Bolt
3- Magnetic Contact Sensor
When the sensor on close state the door bolt unlocks, when the sensor open state the door bolt locks, pretty straightforward. I want the door bolt to stay unlocked for few seconds (4 to 8 seconds) when the sensor goes into open state. How can I achieve that? I read in the forum something similar can be achieve with 555 timer. Is it possible to design a circuit using only simple components such as capacitor, transistor, diode? if possible can someone point me out to the right direction or sharing schematic would be highly appreciated.
Regards,
Fawaz
I have made a simple circuit for a 12V door electric bolt from the below components:
1- 12V power supply
2- Door Electric Bolt
3- Magnetic Contact Sensor
When the sensor on close state the door bolt unlocks, when the sensor open state the door bolt locks, pretty straightforward. I want the door bolt to stay unlocked for few seconds (4 to 8 seconds) when the sensor goes into open state. How can I achieve that? I read in the forum something similar can be achieve with 555 timer. Is it possible to design a circuit using only simple components such as capacitor, transistor, diode? if possible can someone point me out to the right direction or sharing schematic would be highly appreciated.
Regards,
Fawaz