Monday, December 19, 2011

Infrared (IR) LED Flood Light Circuit Diagram


Infra Red (IR) LED Flood Light Circuit Diagram

The adjoining design shows a simple IR flood light circuit diagram for IR illumination applications.

The 4049 section is the basic voltage doubler circuit which effectively boosts the 9 V supply to a level of around 15 V which further becomes the supply voltage for the next 555 pulse modulator section.

 The voltage is suitably pulsed as per the settings of P1 and P2 for driving the associated IR LEDs.

The main feature of this infrared IR LED flood light circuit is that it utilizes just a single PP3 9 volt battery and yet is able to provide lights (IR) at dazzling levels.



21 comments:

  1. This comment has been removed by the author.

    ReplyDelete
  2. Hi Swagatam,

    This above circuit is very tempting and has drawn my attention to consider doing this. What will be the brightness of the above LEDs and can I use normal LEDs instead of IR LEDs and what is the difference between using IR LEDs and the normal LEDs. Also how many LEDs are connected in the above circuit and what is the maximum LEDs that can be had with the above given circuit.

    Regards

    Nagaraj

    ReplyDelete
    Replies
    1. Hi Nagaraj,

      This circuit is specially designed for operating IR LEDs, so cannot be used with normal LEDs.

      Regards.

      Delete
  3. Hi Swagatam,

    Ok then. I just want to get clarified as to whether this LEDs are brighter than the ordinary LEDs and how many LEDs have you connected in the above circuit and how many LEDs can be had maximum.

    Regards
    Nagaraj

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    Replies
    1. Hi Nagaraj,

      IR LEDs don't produce any light, they are just like our TV remote control LED.

      I have connected 7 in one string, many strings as per requirements may be connected.

      Regards.

      Delete
    2. Hi Swagatam,
      I have been looking at making a pulsed IR floodlight that I can use with a camcorder. I was looking at your circuit and don't understand some things. What is the frequency of the pulses, What spec led's are you using what is the max current of the LEd's and so on. Do you have any circuit explanation ??
      Regards
      Simon Strachan

      Delete
    3. Hi Simon,

      The frequency is determined by C4, making it lower increases the frequency and vice versa.

      Here's the LED specs used above:

      5mm LED
      940nm wavelength (most common)
      20 degree beam width
      20 mA continuous, 100 mA pulse
      Approx 1.6V forward voltage

      The IC 4049 is used as a voltage doubler so that more number of LEDs can be accommodated in series, while the 555 is used as a PWM controller.

      Actually the 4049 is not needed, you can simply use the 555 IC solely for the required actions, albeit you will need to remove a few LEDs from each series.

      Delete
  4. goodday swagatam, what value's did you use for p1 and p2?

    regards jacques

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    Replies
    1. Goodday Jacques,

      The circuit hasn't been built yet by me, you can use the formula given in the diagram for evaluating P1, P2.

      Delete
  5. hi ya swagatam

    Do you have a parts list for this setup. . . ..I am building basic 9v Lights with 18 - 20 10mm IR Leds
    940nm, 1.2v FV 20ma and 30 deg beam

    Gotta love foolin around with gadgets lol

    ReplyDelete
    Replies
    1. Hi John,

      The presets can be around 10k, the remaining values are printed on the diagram, just click on the diagram to get an enlarged view and the details...

      yep, foolin around is like enjoying....so keep it up,

      and if you get hold of any of those creepy things do let us know how they look and what they eat...hehe..just jokin buddy

      Delete
  6. lol i really dont thing they eat lol. . . . .

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  7. Good evening swags...

    what is the use of p1 and p2

    can I make 14 strings of led? and what is the value of r4 in case of 14 led?

    can I use it used for night vision?

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    Replies
    1. Good evening Achilles
      p1 and p2 are for adjusting the intensity of the LEDs

      14 leds can be used.
      yes, it's for night vision application.

      Delete
    2. good afternoon Sir!
      Can I make 3 led's in series and what resistor will I use. Then can I make them 3 led's in parallel (consisting of 3 led's in series with resistor). 9 led's all in all.

      Can you give me specific P1 P2 R1 R2 and C4? I dont know how to calculate the frequency or I dont know the purpose of those so just give me a constant values for a good night vision flashlight..
      thanks
      -eshkariel

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    3. eshkariel, yes you can connect 3 leds in series and more such series in parallel, in that case you wont need te 4049 voltage doubler stage, you can power the circuit directly with the 9V batt.
      you can use 470 ohms for each series.
      pi, and p2 are for adjusting the intensity of the Leds and can be adjusted as per individual preference

      Delete
  8. hi swagatam.....
    what is p1 and p2 in the circuit?

    ReplyDelete
    Replies
    1. hi hashir,

      p1, p2 are variable resistances called pot or preset.

      Delete
  9. Good afternoon Sir,
    what are the specification of the ir led? 5mm, 3mm or 1 watt?

    ReplyDelete

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