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SMD LED based Emergency Lamp Circuit

Last Updated on July 27, 2019 by Swagatam 69 Comments

An emergency lamp using SMD LEDs is able to generate illuminations with extreme brightness due to the high efficiency of the SMD type LEDs. Moreover, SMD LEDs also ensure the unit will be very compact and lightweight.

The following post explains a simple circuit diagram of an automatic emergency lamp using 36 nos. SMD LEDs. The circuit has been presented in response to the following request sent by Mr.Ali Adnan.

Circuit Request for SMD Emergency Lamp

I've 36 SMD LEDs(Side View Type), I Extracted them from my Broken Laptop's LED LCD screen. I tested them with multimeter and found all LEDs in working condition.

Now I want to make some useful from them like an emergency LED lite. I'll remove all 36 LEDs from strip and mount them on a PCB (will be Tough JoB Mounting SMD's) once you will design a circuit for me to drive them.

I don't know much about SMD LEDs so that's why I am bothering you. I googled for data sheet for that type of LEDs and I think I found right data sheet for this LED, please also compare the pictures of LEDs and data sheet.

I am attaching actual pictures of LEDs that I have and also attaching data sheet, please check and help me with a simple circuit with simple parts. and just for information I've not found the IC ZXSC310 (that you used in your 1 watt LED circuit) here in Lahore Pakistan 🙁 and I am too sad for this.

Waiting for your Reply.

Best Regards,

Ali Adnan Khan

caution electricity can be dangerous

"Hi Bro,

What kind of emergency light do you want to make? Automatic AC/Dc operated or just direct on battery?

The datasheet  and the pics are OK.

Best Regards,
Swagatam"

"Hi, thanks for your reply bro. Automatic AC/DC operated with battery backup."

OK, here's an automatic ac/dc emergency light circuit using the proposed 36 SMD LED lights which is easy to build, cheap and yet reliable.

CAUTION - THE CIRCUIT IS NOT ISOLATED FROM AC MAINS, UTMOST CARE MUST BE OBSERVED WHILE TESTING THIS CIRCUIT IN UNCOVERED POSITION.
ALTERNATIVELY YOU MAY INCORPORATE A 12V, 500MA DC ADAPTER ACROSS THE ZENER DIODE INSTEAD OF THE SHOWN TRANSFORMERLESS POWER SUPPLY FOR AVOIDING THE ABOVE CAUTION.

The Design of a an Automatic SMD based emergency lamp is shown below, as per the above request specification:

Parts List

All resistors are 1/4 watt, 5%,

  • R1 = 1M
  • R2 = 1K,
  • R3---R14 = 56 Ohms
  • C1 = 2uF/400V PP Capacitor
  • C2 = 100uF/ 25V
  • D1, D2 = 1N4007,
  • D3, D4 = 1N5402
  • T1 = TIP127
  • Z1 = 15V 1 watt zener diode
  • Battery = 12V/2AH
  • LEDs = SMD, 3V white, 20 mA

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About Swagatam

Swagatam is an electronic engineer, hobbyist, inventor, schematic/PCB designer, manufacturer. He is also the founder and the author of the website: https://www.homemade-circuits.com/, where he loves sharing his innovative circuit ideas and tutorials.
If you have any circuit related queries, you may interact through comments, and get guaranteed replies from the author.

Reader Interactions

Comments

  1. Shahnawaz says

    July 27, 2019

    Hi sir, I would like to know about the emergency light with more brightness. Please send me a simple diagram with capacitors value,

    Reply
    • Swagatam says

      July 27, 2019

      Hi Shahnawaz, you can try the concept which is explained in the above article. It will give you maximum brightness. But you will require a Li-Ion battery for the high brightness and long back ups.

      Reply
  2. DYNAVISION says

    May 2, 2017

    Automatic ac led lamp to operate when ac fail and it will go to dc battery circuit digram

    Reply
  3. siddharth sharad srivastava says

    April 11, 2017

    hello sir,
    sir i want to use two 6v 1aH BATTERIES in series with the circuit,so what modification would be required.

    Reply
    • Swagatam says

      April 12, 2017

      Hi Siddarth, you can use the same circuit as given, no modifications would be required,

      Reply
    • siddharth sharad srivastava says

      April 16, 2017

      sir the batteries i am using are 6V1aH li-on battery, Will that suffice ??? also the led smd i have with me has 84 units in it so any modification would be required???
      Also i want to add a feature of IR control, so what should i do??

      Reply
    • Swagatam says

      April 17, 2017

      Siddharth, 6V 1ah is OK for the circuit, but it won't support 84 LEDs, it would get discharged very quickly.

      for IR control you can try the following method

      https://www.homemade-circuits.com/2012/02/how-to-make-simple-infra-red-remote.html

      Reply
  4. siddharth sharad srivastava says

    April 11, 2017

    sir,
    i want to use two 6v 1AH batteries in series. So what modifications would be required.

    Reply
  5. Siddh says

    September 10, 2016

    Hii.i want 220ac to 22volts dc 2.5amps circuite with out transformer.

    Reply
  6. karthik kanna says

    January 18, 2016

    sir how much time does take for full charge??

    Reply
  7. Swagatam says

    January 14, 2016

    70mA 12V

    Reply
  8. Arun Kumar says

    January 13, 2016

    This circuit how many output voltage & amps

    Reply
  9. Arun Kumar says

    January 12, 2016

    I used 12v realy this circuit out voltage & amps please tell me sir

    Reply
    • Swagatam says

      January 13, 2016

      use a 12V relay with 300 ohm or 400 ohm coil resistance

      Reply
  10. Arun Kumar says

    January 12, 2016

    I used ac supply working time LED OFF MODE I used relay what volt realy used sir please tell me sir

    Reply
    • Swagatam says

      January 12, 2016

      relay coil voltage should match the zener voltage….

      Reply
  11. Arun Kumar says

    January 11, 2016

    Iam add in 12v 2 amps Battery Two Battery parller

    Reply
    • Swagatam says

      January 11, 2016

      ok will do.

      Reply
  12. Arun Kumar says

    January 10, 2016

    I want one 12v 4.5amps battery any modifications circuit diagram please tell me sir

    Reply
    • Swagatam says

      January 11, 2016

      no modifications would be required

      Reply
  13. Arun Kumar says

    January 8, 2016

    Thanks you sir

    Reply
  14. Arun Kumar says

    January 6, 2016

    How to converted battery zener series
    Or parller connect please tell me sir

    Reply
    • Swagatam says

      January 7, 2016

      connect the black line of the zener with the battery (+) terminal and the other side of the zener with the battery (-) side…use a 14V 1 watt zener

      Reply
  15. Arun Kumar says

    January 5, 2016

    How to Stop over charging this circuit

    Reply
    • Swagatam says

      January 6, 2016

      connect a 14V/1watt zener diode right across the battery terminals, this will do the job for you.

      Reply
  16. Arun Kumar says

    January 5, 2016

    I used 12v 4.5amps this circuit

    Reply
  17. Arun Kumar says

    January 4, 2016

    I used 6v 4.5 amps this circuit diagram

    Reply
    • Swagatam says

      January 4, 2016

      you can use the second circuit from the following article:

      https://www.homemade-circuits.com/2014/06/flashing-led-battery-status-indicator.html

      use only a single 5mm red LED with the last transistor

      Reply
  18. Arun Kumar says

    January 4, 2016

    How to fixed charging indicate led ?
    I used 2 12v 2 amps battery parallel how to modify circuit?
    This circuit support 6v 4.5 amps battery used?

    Reply
    • Swagatam says

      January 4, 2016

      Connect a resistor in series with D2, and connect an LED parallel to this resistor, as long as the battery charges this LED will glow and will gradually shut-off as the battery reaches full charge.

      the resistor value could be anywhere between 2 and 10 ohm….you will need to experiment the right value

      if possible connect a 47 ohm resistor in series with one of the LED lead for safeguarding it

      Reply
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