I am senior at Penn State University and we are doing a senior project where a portion of it requires an IR emission and reception. This project is not a school project and will require a high degree of expertise in the Rf field to successfully build it. thanks iyiola, you can try the same circuit which is discussed in the above article. RF modules does not require programming, they can be procured readymade but I am not sure about their maximum range, I have never seen a 1km RF remote control device in the market. https://homemade-circuits.com/2014/08/spy-bug-circuits.html, Once you do then the next step would be to build a 500 meter range transmitter, and after that finally you could try the 5km range design, Sir, First of all, thank you very much and "PRONAM". Notify me of follow-up comments by email. As the MOSFET exhibits large capacitance across gate-source terminals, a special drive arrangement has been made using npn-pnp Darl ington pair of BC547 and BC557 (as emitter followers), to avoid distortion of the gate drive input. thank you yasif, I am glad it worked for you, appreciate your efforts…. Required fields are marked *. It uses three infrared transmitting LEDs (IR1 through IR3) in series to increase the radiated power. Dear Swagatam,Can I add MPX(stereo, RDS) at the audio input of this transmitter? Hi Melvin, please read the comments, I have answered it in one of the comment replies. Sir its possible to put crystal oscillator in transmiteer and receiver. what I actually want to do is incorporate the receiver into the transmitter system as a device for distance learning. The proposed long range transmitter circuit really is very steady, harmonic free design which you can use with standard fm frequencies between 88 and 108 MHz. So i should applied my 12v to the terminal that is connecetd with 100 ohms resistor? Required fields are marked *. This infrared receiver circuit is using only few components and it is able to receive 38KHz carrier signal. Secondly, i am not understand the symbol of 10 uF capacitor that connected with 100 ohms resistor. It includes an extremely consistent oscillator for the reason that you employ LM7809 stabilizer that is a 9V stabilized power source for T1 transistor and for frequency realignment that may be reached by means of the 10K linear potentiometer. ie the relationship between T5, L4, L5 and the two trimmers. 3)100/0.5W = 100 ohm 1/2 watt resistor 4) 10uF/25V 5) The shield partitions explained above must be aligned across these shown dotted lines such that they stand like walls on these dotted lines…the height of these copper shield plates could be 2 cm and thickness could be 1mm. An IR transmitter and receiver pair forms a simple circuit. please post one to me please its urgent. how to tune such transmitter pls help. You can search online for a high power RF transistor, you might get some clue. Thanks for the work on this project. Sharoj, you can try the following circuit, https://homemade-circuits.com/2014/11/rf-signal-jammer-circuit.html. Assemble the circuit on a standard PCB. The majority of the IR remotes do the job reliably within a range of 5 metres. I dont know how to use it 2) What is shielding. Assemble the circuit on a general-purpose PCB. I JUST WANT TO KNOW HOW MUCH DISTANCE IT WILL GO THIS TRANSMIT ION, obstacles like trees is a problem or not, become i am going to use in area little like a forest, so is this successful to transmit 1 km ? Clarify to me please.Regards. Please sir, i want make a final year school project of ( VOICE TRANSMITTER AND RECEIVER) please can you help me with the Circuit?? Dear Engineer,If I want to get 10km Range then what no of transistor should be used in this circuit.Also suggest what type of antenna is suitable for it ? ?or you advice me to better look for another kind of transmitter. Long Distance IR Transmitter Circuit Document, Laser Communication (Transmitter – Receiver), 25 Metres Range, Short Wave AM Transmitter. The proposed transmitter circuit works in the following manner: I almost got all the components except the component between T4 and T5 labeled as 100/0.5w,connected with 10 micro farad, i don't know it's name and purpose.can you tell me about the antenna and the pcb choice, please?it will be nice if you put the video of how to construct. Dear Swagatam,I would like to have a receiver for this transmitter for switching purpose, is it possible and logical? Thanks, Thanks Abdul, They basically act like an LC tank circuit which resonates with the frequency of T4 stage and concentrates it many folds so that it gets amplified enough for the long distance transmission. To double the range from 5 metres to 10 metres, you need to increase the transmitted power four times. Thanks Mr Swagtam I hope you will find solution..i believe in you, Thank you very much for sharing your knowledge. And I don’t exactly know where to put my antenna after. To double the range from 5 metres to 10 metres, you need to … The concluding stage of the long range rf transmitter is equipped with any rf power transistor containing no less than one watt production power. With 1971 transistor how much power can provide by this circuit?? Hi Habtamu, please click on the diagram to enlarge it, you will be able to see all the details clearly. I have recently build lots of low power fm transmitter all claiming about 1km range but at most I could get 500mts only. sir i want to make a RF transreciver of range upto 3km. excuse me what is the audio and what is the output?
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