Remote control tester Circuit

Description

This is a simple remote controller tester circuit  based on infrared sensor IC TSOP 1738. When the IR waves fall on the sensor it output changes to low state. This makes the transistor Q1 (BC558) ON and LED will blink according to the code contained in the signal. So for the press of each button the LED blinks in different ways. This is a good indication of the working of remote. The diode D1 drops 0.7 V to give the IC ~ 5V supply from the available 6V. R2 is a current limiting resistance.

The transistor BC558 can also be replaced with others like BC158, BC177, S8550, 2N2905. If you find the LED glowing all the time even if you cover the IR sensor it may be a problem with the IC. This ICs output with no signal will be high and with signal it will become low. May be the quiescent current through IC1 itself is biasing Q1 may be your specimen if of quite high gain. You can try by shifting the emitter of Q1 to R2 IC1 junction, which may solve your problem.

You can modify the remote control tester circuit to connect a  piezo speaker between the transistor collector and the negative terminal for sound indication.

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Remote Control Tester Circuit Diagram with Parts List

Remote Control Tester Circuit
Remote Control Tester Circuit Diagram

ComponentsSpecification
Infrared SensorIC TSOP1738
R1, R310K
R247 Ohms
D11N4001
D2LED
PNP Transistor , Q1BC558
Battery6V

Notes

  • Use a 6V battery to power up the circuit.
  • This circuit can be used to test remotes operating in the 38Khz carrier frequency.Almost all remotes fall into this category so no problem.

IC TSOP1738

The Remote control tester circuit uses the IC TSOP1738 for its working. This is an IR remote control receiver module which is embedded with a PN diode and a pre-amplifier to form one pack. This IC produces an active LOW state output and provides a HIGH +5 Volt at OFF state. That is, when IR radiations with a frequency of 38KHz (sensitive frequency of TSOP1738) are received by the IC, its output will be LOW. All the unwanted rays coming from sunlight, high wattage bulbs and so on could produce an undesired output for the sensor. This can be avoided by using a Band Pass Filter (BPF), an integrator circuit and an automatic gain control.

The pulses that are received from the IR Transmitter are amplified using a control module inside the IC. The PIN diode produces a signal corresponding to the signal it receives. The AGC adjusts the gain to a certain level according to the signal it receives from the PIN diode. The AGC sends its output to a BPF and filters unwanted frequency. These frequencies are then passed on to a demodulator and then to a transistor. The collector output of the transistor is obtained at Pin 3 of the IC.

We have more Remote Circuits in our website; that you may like to read:

1. Remote Control Circuit

2. Remote Controlled Switch

3. IR to RF Converter Circuit

4. Remote Toggle Switch

5. IR Transmitter Circuit
Author

43 Comments

  1. akhilesh

    Sir,

    if I connect toy motor (3-6V DC motor,toy motor) instead of LED-D2, it can work?
    i want to use this circuit to my baby toy car

  2. akhilesh

    Sir,

    if I connect toy motor (3-6V DC motor,toy motor) instead of LED-D2, it can work?

  3. can we use 9v battery instead of 6v battery…pls help.

    • Yes, but you must use a 5V stabilizer (78L05, for example) to the IR sensor (to replace D1, R2) and recalculate R3 for optimum power LED (D2). It can connect a piezo speaker between the transistor collector and the negative terminal to take and sound indication.

  4. pse send me full description with components wise and circuit diagram of remote controlled car with wireless camera at a distance 50-100 mtrs.

  5. give me power electronics circuit diagram in pcb and bradboard imm.

  6. seetharaman

    Hi Rahul BC548 is NPN transistor. you have to use PNP transistor like BC558, 158, 177 or S8550 2N2905 etc.

  7. can u plz tell me that if we use BC 548 here in this circuit , then will it work properly and will there be any change in position of transistor? PLZ Reply It’s urgent…

  8. This remote tester is working successfully for all kind of remotes. thank you very much

    but i need clear clarification about this tsop i read in online but not clear can u help me.

  9. Hi,
    can U give a circuit diagram for made a remote controle switch for bulb or fan

  10. Dear Mr.Thomas

    I have requested you for Synchro to Digital Conversion circuit diagram

    Can U please send me at the earliest

    Thanks

    Kamesh

  11. seetharaman

    Dear Krishnamurthy
    I am still hed up at Rajasthan. I am expected at Chennai by this month end. I will positively try and give a feed back. Sorry for the delay.
    I use standard 3pin IR sensor of TV receiver module at
    RS 25.00, in my remote sensor tester. the circuit which i am using is http://www.electronicsforu.com/efylinux/circuit/cir123.gif
    quite useful stuff to check all remotes at home.

  12. Krishnamurthy

    Dear seetharaman did you tried the circuit at your lab, can you tell me the problem in the circuit – Krishnamurthy.

  13. seetharaman

    dear sri krishnamurthy i am back at my lab. in a day or two i will try a design and come back to you.

  14. Krishnamurthy

    Dear Mr. Seetharaman Iwas able to view the circuit you were refering. This may not work properly. Please check with my comment in the above site

  15. Krishnamurthy

    Dear MR. Seetharaman
    Idont know how to paste the circuit in this submit column. I can describe circuit I used. I used 555 timer as austable MV to oscilate at 38Khz. The out put is fed to a 2N3019 transister basae via 1K res. Emiter connected to ground. The IR diode is connected to the collector through a 67 Ohm resister. The supply volt is 6V. I measured the frequecy at the collector and confirmed the signal is available. There is no other way to check transmission. But IR detecter is not detecting.

  16. seetharaman

    Hi Krishnamurthy the problem with the circuit is the current feeding the chip is through the diode hence always there will be a drop of 0.65 volt which will trigger the transistor continuously that is the reason i recomended you to shift the emitter. The IC is with IR filter so it should work with any single IR diode transmitter. You may check you transmitter, you can mail me your circuit i will try and suggest if anything required

  17. Krishnamurthy

    Hi Seetharaman Thank you for your help. Just before getting your comment I tried connecting a 4.7K between base and emitter of Q1. The problam was solved! It detected T.V remote signals. But alas it could not detect IR transmitter I have built. Just how many IR diodes I have to use to get the receiver work? I used Just one.

  18. seetharaman

    Hi Krishnamurthy, This ICs out with no signal will be high and with signal it will become low. May be the quiescent current through IC1 it self is biasing Q1 may be your specimen if of quite high gain. Can you try by shifting the emitter of Q1 to R2 IC1 junction, which may solve your problem. Since I am away from my lab, could not try and give you a feedback.

  19. Krishnamurthy

    Iassembled this circuit. But the LED glows constantly even if i compltely cover the IR sensor. What could be the problem? Please help me.

  20. hi,
    i required the circuit which can turn on/off two or more devices using normal remote.
    plz help me out..

    thanks

  21. twits4twats

    Dear All No need go to make this circuit digram pls use ur camara mobile phone
    1)on u r mobil phone camara
    2)Press button remot control show the lence
    3)u can look very clear IR Led Flashing mobil phone display screen

    Rafeekh.k.k
    008613620429895
    rafeekh@gmail

    Rafeekh

    Once again, sometimes the most obvious solutions are staring you in the face. You are correct, if you turn your cell phone camera on and face it directly into the infra red LED’s, you will see the LED’s shining white. ***WARNING*** DO NOT LOOK DIRECTLY INTO THE INFRA RED LED’S. Prolonged exposure can harm.
    Please note that the purpose of this website is education and why use something mass produced if you can build something yourself and learn something in the process.

  22. the circuits u r providing is wondrful………….
    ithink it will be more if you explaian the working with each component in it.
    ALL THE BEST

  23. amit siroya

    honerable,circuits today

    I am regularly visitor of your site.i want to make a circuit.the application of this circuit is when we speak any word in this manner led will on.this project will based on the led.ex.i say “technology”in this manner led will on and i saw this word on display.
    so,give me circuit for this application.and also give me program of this circuit.

    thank you,

  24. i need a mobile locator circuit with small display could u give me?

  25. rafeekh.k.k

    Dear All No need go to make this circuit digram pls use ur camara mobile phone
    1)on u r mobil phone camara
    2)Press button remot control show the lence
    3)u can look very clear IR Led Flashing mobil phone display screen

    Rafeekh.k.k
    008613620429895
    rafeekh@gmail

    • that’s a good idea.mobile cameras can sense IR and its of course the best idea.

    • please tell me which type of remote control circuit you need

  26. Hi “admin”

    Can you give a circuit diagramme of ‘SATELITE DIRECTION FINDER’

  27. this article is very good.but can you provide the toturial guide for all articles?.