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.



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23 comments

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June 19, 2012 at 8:47 PM delete This comment has been removed by the author.
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October 29, 2012 at 9:23 AM delete

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

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October 29, 2012 at 10:15 AM delete

Hi Nagaraj,

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

Regards.

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October 30, 2012 at 1:42 PM delete

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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October 30, 2012 at 3:51 PM delete

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.

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Anonymous
September 7, 2013 at 2:42 AM delete

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

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September 7, 2013 at 6:17 PM delete

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.

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Anonymous
November 16, 2013 at 1:30 PM delete

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

regards jacques

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November 17, 2013 at 11:23 AM delete

Goodday Jacques,

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

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December 11, 2013 at 3:42 PM delete

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

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December 12, 2013 at 9:58 AM delete

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

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December 14, 2013 at 3:37 AM delete

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

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February 12, 2014 at 5:37 PM delete

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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February 13, 2014 at 7:54 PM delete

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.

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April 1, 2014 at 5:57 PM delete

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

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April 2, 2014 at 11:37 AM delete

hi hashir,

p1, p2 are variable resistances called pot or preset.

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April 21, 2014 at 1:45 PM delete

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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April 21, 2014 at 9:42 PM delete

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

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April 26, 2014 at 3:24 PM delete

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

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April 27, 2014 at 9:14 AM delete

Good morning eshkariel,

it's 5mm, 20mA

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January 26, 2016 at 4:02 AM delete

HI Engr. Swagatam....
I have a few questions...
In what mode does the IC555 operate...

and hey can you help me out about the circuit's theory of operation?
cause I need this in our school....our goal is to find any circuits with digital IC....excluding IC555...and found this circuit ok...so I guess I need your help...

btw the 555 here is ok...just need to know the mode...


tnx alot ^_^

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January 26, 2016 at 7:21 PM delete

Hi eshkariel, the mode is astable with variable PWM functionality using the shown oppositely configured diodes at its pin#7 and the pots.
the explanation can be very lengthy, so it may not be possible here....

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