2$ PCB NE555 Door Lock Timer
by james_workshop in Circuits > Electronics
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2$ PCB NE555 Door Lock Timer
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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
Schematic
- 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 x 1
- 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 X1
PCB
I use EasyEDA to design PCB and upload the design to JLCPCB.com to manufacture PCB.
JLCPCB make high quality prototyping PCBs for people all over the world. They have over 300,000 worldwide customers with over 8000 orders per day! They have over 10 years of manufacturing experience and are super reliable. Try it for your self and get 10 PCBs for just $2 at JLCPCB, New registered users US$54 offer , Order here
Just a quick example how to order PCB from JLCPCB.com:
1)press "QUOTE NOW"
2)press "Add your gerber files"
3)upload zip or rar
4)all properties could be left default
*the only thing You should change from properties is PCB Color
gerber files
Solder
just are soldered according to the Schematic, they can be used, no need programming and debugging