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Simple Infrared Transmitter Circuit

Last Updated on September 22, 2021 by Admin 7 Comments

The presented simple infrared transmitter circuit design can be used in the form of an infrared remote control, with a frequency modulated tone, to operate a complementing IR receiver circuit.

How the Circuit Functions

The transmitting frequency is determined by C1 and adjusted using the trimpot 100k.

The transmitter amplifier-circuit/">watt-led-lamp-wiring-details/">LED must be of the infrared type and more power can be achieved by connecting two LEDs in series with a series 100 ohm limiting resistor (using no less than 22).

The supply voltage which becomes the operating voltage for the infrared transmitter can also be increased to 9V in order to compensate the presence of the LED resistor.

Simple Infrared Transmitter Circuit

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Tagged With: Transmitters

About Admin

Hey friends, Thanks a bunch for stopping by this site! I am an engineer with a Bachelor of Engineering in Electronics and Telecommunication. One of my passions is gathering information from all sorts of electronics books and tutorials. I then take that information and compile it into a language that is super easy to understand. My goal is to make those complex electronics circuit concepts and technical terms much more accessible for all the new and budding electronics engineers out there. I can also design customized circuit diagrams as required by the users.
If you have any questions related to this field, please do not hesitate to drop a comment! I am always here and ready to help you out with any queries you might have. I cannot wait to hear from you!

Reader Interactions

Comments

  1. Jari says

    February 23, 2023 at 4:09 pm

    Hi,
    I made this circuit and it won’t work.
    Is everything correct in that drawing?

    Reply
    • admin says

      March 6, 2023 at 11:31 am

      Everything is correct in the drawing. It is a simple oscillator circuit. Replace the LED with a speaker and check whether it is emitting a tone or not.

      Please make sure the 47nF is not connected to the emitter of Q1….it is directly connected to R3.

      Reply
  2. Samwel Muyengi says

    December 8, 2022 at 9:19 am

    Hi everyone, I am thinking of making a multiple channel IR transmitter and receiver without using any ic ,can you help me with that?

    Reply
  3. Denisa Anghel says

    June 15, 2021 at 3:18 pm

    Hi! Can you please tell me for what are the bipolar transistors used for? Are they used as a switch?

    Reply
    • admin says

      June 28, 2021 at 4:47 pm

      Hi, yes the main application of BJTs or any type of transistor is like a switch, and also like an amplifier

      Reply
  4. Anil Kumar. K says

    October 14, 2017 at 12:59 am

    Hi I assembled this circuit. Supply voltage is 5vdc and one IR LED from a TV remote control. I got 25cms range.

    Currently I am using two seperate identical circuits for driving LEFT and RIGHT LED’s of an ” Ostacles avoiding robot toy car ” . I want to use single transmitter for two IR LED’s in series on 9VDC supply. What changes should I make…..?
    ( You have already explained 9v connection in the article.
    But I didnot understand it. Can you please explain it some other way ….? )

    Reply
    • admin says

      October 14, 2017 at 6:41 pm

      Hi, I am glad you could make it….for using two LEDs you won’t have to change anything, just connect another LED in series with D1, and use 9V as the supply…may be 100 ohm could be changed to 150 ohms, that’s all

      Reply

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