NE555_Door_Lock_Timer

NE555 timer was launched in 1971 and has a history of 50 years. It is easy to use, stable and cheap, so it is still widely used, and its output in 2003 was 1 billion. Now I use NE555 to make an electronic door lock timer. Most of the control parts of electronic door locks use this circuit. The timing method is very simple, 1.1 x RC, which is not very accurate compared with MCU, but it is very simple

Here is a record of my production process.

Hardware

• NE555 x 1
• 20k Ohm Resistor x 1
• 10k Ohm Resistor x 2
• 4.7k Ohm Resistor X 1
• 3M Ohm Resistor X 1
• 200k Ohm Trimpots x 1
• 100uF 25V Capacitor X 1
• 10uF 50V Capacitor X 1
• 22uF 25V Capacitor X 1
• 220uF 25V Capacitor X 1
• 10nF 50V Capacitor x 2
• M7 Diode(1A 1kV) x 3
• MMBT3904 NPN Transistors x 1
• 12V Relay(SRD-12VDC-SL-C) x 1
• 2x3 pin male header
• Jumper block x 2
• Large Green screw terminals (KF128-2.54-3P) x 1
• Large Green screw terminals (KF128-2.54-4P) x 1

PCB

I made a PCB at JLCPCB.com, which makes it very easy to make!

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You can use my Gerber file to place an order at JLCPCB.com

Change log of Version

V2.1

Adjust PCB size

V1.1

• First version
  
  
  
  

How to make

https://youtu.be/QX0m35GGe1k