Hi, i'm working on a project, and i need a high range transmitter to send a signal to a receiver from a distance of at least 1 mile (1.6 Km) is it possible ? Thanks :)
Asked by fox.sadik 3 years ago | last reply 3 years ago
I trying to write specification for transmitter that transmit voice signal over 100 meter long at 97 mhz frequency modulation type Input voltage 12 v input current 9 mA input power output voltage output current output power operating frequency 92 - 97 Mhz oscillator circuit that generate 97 mhz frequency transmitting distance 100 meter long how to decide how much output voltage and current I need at output side ?
Asked by vead 4 years ago | last reply 4 years ago
Asked by manikantak136 6 years ago | last reply 6 years ago
Hi guysI am trying to build a three stage fm transmitter and for the life of me I cannot find a 5-20p trimmer cap anywhere as well as the copper tinned coils...what can I replace the trim cap with.....a cap with a different value? and what can I replace the copper tinned coils with....normal 18 gauge wire coil?..any help will be welcomed
Asked by JJK6 2 years ago | last reply 2 years ago
So i bought a rc heli from a thrift store and it turns on when the switch is flicked, but it came without the transmitter/controller for it, i checked the hobby shops and they said that they don't have any spares for it it says on a sticker that the heli is a 27MHz, so i was wondering, if i got a transmitter that was designed for helis and ran on the same frequency, in theory it'd work, right? can anyone lend me some advice?
Asked by mammasboy 4 years ago | last reply 4 years ago
I bought a FM transmitter for an ipod. I would like to boost the range of the device. (I know it is illegal but would like to get more range than 2 feet.) I think I need to build an external antenna but need to know where to hook it up to the thing. The transmitter I have is a ge FM transmitter for ipod.If anyone has done anything like this or have any useful links it would be great. I don't know anything about circuit making so help would be great on that as well.
Posted by thejrb 10 years ago | last reply 2 years ago
I'm trying to build a guidance system for RC airplanes and drones. This should work by sending different IR signals to different locations in the air, so the drone will pick up signals specific to one location, enabling it to know where it is. (Like a mini, simplistic VOR, if you know about aviation) I'll probably use an Arduino on the ground with the transmitter, and a Raspberry pi onboard the airplane. I would like the IR signals to reach as far as possible, so does any one know of any small, high power IR LEDs? Also, if you have a good idea on how the signals could be accurately focused, so they line up next to each other without over lapping, let me know.Thanks!
Asked by King Awesome 6 months ago | last reply 6 months ago
I had made a FM transmitter using IC NE555. When i power the circuit with 9V battery,the transmitted audio is clearly received in my radio receiver.The problem is the battery will soon drain out and also as the battery starts to drain the transmitted frequency changes without my knowledge.So as the battery voltage decreases the frequency is also changing.To eliminate this problem i used transformer powered source with 9V Regulator 7809.When i power the circuit with transformer the received audio signal on my radio receiver has so much of noise added.The audio quality which i transmitted is completely lost.Anyone Help me to resolve this problem.
Asked by Rajkumar2506 1 year ago | last reply 1 year ago
I have looked into commercial transmitters, but they are too expensive, and do not achieve the range I want. I would like a transmitter that can transmit video at least 1 mile, but is still legal without a license.
Asked by kjjohn 8 years ago | last reply 6 years ago
I have a GWS 2.4GHz transmitter and receiver, seen here. http://www.robotmarketplace.com/products/0-GWRX4SB.html http://www.robotmarketplace.com/products/0-GWS24TR.html Essentially, I am attempting to make a sumobot with two motors taken from an electric screw driver (two wires positive and ground) The receiver is marketed for model airplanes, but I was assured it also works with motors. I am unsure what to plug into where. The receiver has three pins per channel: positive, ground and signal. Does anyone know how I should set this up?
Asked by gotparsley 7 years ago | last reply 4 years ago
I am building fm transmitter i am finished with every thing in circuit leaving antenna i searched for d.i.y. antennas but there were many confusing names of antennas i dont want to go through all those defination, uses ,advantages etc. of those antennas so please help me choose. I am adding a image of my circuit please help me choose from dipole, 1/4 wave ground etc. antennas. It will be nice if u tell me any d.i.y. to make your suggested antenna. Remember i want my transmitter to work from 88-108 Mhz
Asked by Atul009 5 years ago | last reply 5 years ago
Iv'e done a quick search and not come up with anything yet. Im a scout leader and for some of our events we need to be able to do announcements over the radio but as most of our sites don't have loud speakers set up all the time we have to rent them, and the people to set them up. Even with a discount this can go into the thousands and that goes back to the kids costs and well i hate that. Anyway after playing around with my partners short distance radio transmitter that plugs into her iPhone i wondered if its possible to modify, or build a transmitter like this for longer range. Anyone got any links? It needs to be fairly clear, doing music and announcements that people can hear over about one km to one mile.
Asked by jjefferson1 6 years ago | last reply 6 years ago
PLZ help me to make a FM Transmitter in the range of 5 Km. with a easy way
Asked by fine 8 years ago | last reply 4 years ago
Most mosques in durban , south africa transmit live trasmissions using fm transmitter. the previous transmitter was independent with its own pick up microphone. only needed to switch on transmitter and you could hear the talks on the fm receiver. most programs dont require use of amplifier . we updated and now the new transmitter is connected to amplifier which is compulsory to switch on if you need to transmit . it is also a flat sound whereas the old trasmitter picked up a good echo sound. is there any device that the transmitter can be plugged into instead of the amplifier that has a pick up microphone. thanks mahomed
Asked by modtrend 3 years ago
Electricity Transmitter and receiver. is there anything such as that. simple though. when i press a button it transmits a signal and the receiver receives this signal and releases electricity. heres a little diagram: O------T B-R-----M O=Button T=Transmitter R=Receiver B=Battery M=Button -=Wire =Air? the receiver is powered by the battery
Asked by pkataria1 5 years ago | last reply 5 years ago
Asked by mobitz 9 years ago | last reply 9 years ago
I am looking to have a Micro transmitter for an invisible fence made. This will need to trigger the invisible fence shock collar when it gets within 2 feet. I have a dog with a shock collar that attacks a smaller, older dog in the house. I want a transmitter that will fit on the collar of the smaller dog, run off of batteries with a LED to show it is powered on. I have an extra receiver to test with, and i can send photos of the transmitter and what information i have. Willing to pay COD for delivery.
Posted by GGryphon 9 years ago | last reply 9 years ago
My wife has a real small FM transmitter that snaps on to her iPod and streams her music in stereo to her car speakers. I only have the iPod nano which only has a headphone jack, it doesn't have the standard iPod connector. I was looking to see if there's an easy instructable that can make a nice sounding FM stereo transmitter. The only thing I could find was this one: http://makeprojects.com/Project/Micro-FM-Transmitter/721/1 and I'm not sure it's transmits in stereo. Pretty sure the one my wife has doesn't use the coil method either. Anyway, is there something else that I can be pointed to as a starting point? I was thinking of maybe sticking the whole thing into a small altoids box and I can use it in my car. I didn't know if that project is the only real one out there. any help is greatly appreciated, thanks!
Posted by ericb1 7 years ago | last reply 7 years ago
In the attached photos, I have the schematic for an FM transmitter. I pulled a trimmer out of a shower FM/AM radio. It has six leads. In the photo you can only see five of the leads. The sixth one is on the other side and is shorter. I'm pretty sure that one was for the AM. Can anyone tell me how I would connect this? The one in the schematic has only 2 leads to connect. Thanks
Asked by pennsteve 8 years ago | last reply 8 years ago
Can anyone design a device that would interfere with cars stereos within 10 feet or more?Yes, I would like to bother back the drivers who play the music so loud that they wake up my kids sleeping in our car, as they drive by.Any idea is appreciated. If I can get my music in their stereos, even better, but if I would just get white noise in their stereos would be great. Thanks
Asked by scalin6 7 years ago | last reply 7 years ago
I want to build a fm transmitter with 400m range. I already have a custom made amplifier all I need to know is how to transmitt the signals. I don't need a mic I will play it through mp3 player. plaese help me and give me a circuit. sorry for my bad english.
Asked by jumper1111 5 years ago | last reply 5 years ago
I dont want a mile of cord that somebody could trip over....
Asked by conrad2468 9 years ago | last reply 9 years ago
Hello every one i need some help or any suggestion. about transmitter and a receiver that is being attach in a toy car so that if the transmitter transmit signal the receiver from a toy car will detect it and the toy car will go to the transmitter antenna area... thanks for your answer or suggestion...
Asked by jir3h 8 years ago | last reply 8 years ago
So i have an epic prank in mind. i would like to (while sitting in the audience of an assembly) be able to transmitt through the wireless mic reciever the speaker is using. the frequency of the transmitter needs to be adjustable. any ideas?
Asked by jmatthew408 8 years ago | last reply 6 years ago
So I am very angry at this point. I've made over a dozen FM transmitters and they NEVER work. The list includes http://makezine.com/projects/super-simple-fm-transmitter/, http://www.buildcircuit.com/simple-steps-for-making-fm-transmitter/, https://www.instructables.com/id/The-Ultimate-FM-Transmitter/. These are just a few. I use all the right parts and I make all the right coils just like they say. What is wrong with me or my circuits?????
Posted by HavocRC 4 years ago | last reply 4 years ago
I cant really find the c 38 resistor the one im finding at the end of the red ant wire is the IR2j do i solder on the transmitter side? sorry cant get a pic on here yet
Asked by wildman29 9 years ago
I plan on getting http://www.nitroplanes.com/79p-th9x-r9b-9channel-radio.html I have a lot of questions relating to this transmitter and receiver: 1. Is this a trustworthy vendor 2. Can the transmitter/Receiver control heavy duty servos 3. What type of/how many batteries do i need 4. For the transmitter, Can I use http://www.walmart.com/ip/Energizer-NH15BP-4-Energizer-Rechargeable-AA-Batteries-4-Pack/14497459 5. Which battery do i need for the receiver 6. Can I charge these http://www.nitroplanes.com/77p-recharge-aa-2200-8pcs.html ----- with an energizer charger 7. Will this work for the transmitter http://www.nitroplanes.com/77p-sl2650-4s1p-20c-4444.html 8. Where can i find batteries for the receiver?
Asked by rptech 4 years ago | last reply 4 years ago
Hi I'm doing some experiments with an fm transmitter. Now, instead of transmitting and modulating audio, I wanna try to feed the base of transistor using a ramp generated by a NE555. I ended up with this schematic http://s30.postimg.org/pbe0oyu4x/base_sawtooth_modulation.png , would be ok to pass the signal on the base using a 220 ohm resistor and a 10nF capacitor? I suspect that I have to increase the value of the resistor R5. kind regards.
Asked by akopelumenuscu 3 years ago | last reply 3 years ago
I am in confusion. Actually i have a wireless bell but of shorter range. So i thought to extend its range. I want to add one more pair of receiver and transmitter in the way. So when bell button is pushed, transmitter will send to receiver and receiver will complete circuit of transmitter and another signal to other receiver of bell. So it will double the distance. If it is possible kindly help me out. I am new in this field so explain me and tell which parts i need to buy. Thank you.
Posted by RollingS2 1 year ago | last reply 1 year ago
Hey guys i recently bought a maccally fm cup at walmart. it was on clearance for $7.50 so i got 2 incase i ever needed some spare parts on the cheap. so now i have this extra FM transmitter, and i would like some ideas as to what i could do with it. The best i have come up with so far is putting the whole thing in something else (like a project box) because my cupholder is not the best location for my ipod.
Posted by aaronx 10 years ago | last reply 7 years ago
I know that the band for cell phones is between about 800-1990MHZ and I was wondering if it would be possible to hack an AM transmitter or for that matter an FM ipod type transmitter into the cell phone range like KipKay did in his instructable with a reciever so that if you transmit noise it would disrupt the cell phone call and make them hang up. This is just an idea I had that would be the alternative to creating a jammer like the Wave Bubble made by Lady Ada that would be a lot easier and cheaper. This is not intended for bad purposes, its just for fun. I might not even make it but I am still wondering if it would work.
Asked by beak90 9 years ago | last reply 9 years ago
Hai my rc car receive the commands only when the antenna of the transmitter touches that of the carpls help me to solve this ineed my car to go far?
Asked by liketodrift4 8 years ago | last reply 8 years ago
I want to start hosting silent discos but I can't find anywhere that helps me with that. I want to start small. Have my one sender being my laptop and then I want a ton of small receiver boxes people can hook their headphones too. Anybody know a cheap solution? Or good links in how to make what im thinking of? Hopefully not fm or am if possible
Asked by PyroTrician95 5 years ago | last reply 5 years ago
I have got a cheap Chinese Mobile Phone which has got Analog TV reception through an antenna it catches signals on the vhf band. My area only has two wireless analog channels, all other channels come through an analog signal through coaxial wire from the cable operator, when i place the cell phone few inches from the coax cable it gets almost all the channels otherwise it gets only the single channel. I am looking into making a transmitter or signal amplifier + antenna to boost the coaxial signal so that i can tune into the channels within a short range i.e the room. The signal coming through the cable is PAL BG VHF 50-850Mhz.
Asked by shad0w88 8 years ago | last reply 8 years ago
I wish to make an extremely small (size and part count) AM transmitter using only a few transistors and passive components. I wish to transmit an audible tone on a set frequency.I am thinking along the lines of a transistor flip-flop circuit oscillator, perhaps routed through another. It really needs to have less that five/six small components. DIP components are too big. Small electrolytic and other capacitors, transistors, and resistors are acceptable. Transmission distance needs to be at least 1/4 of a meter, but further is better. It needs to run on between 1.5 and 6 volts, low to middle'in milli-ampage im thinking watch batteries for a few hours at least. I have read the following article but as stated before it needs to be very small. https://www.instructables.com/id/Make-a-simple-AM-transmitter/Can anyone help me out with a schematic, thoughts or advice?Thanks in advance,-AndyP.s. I can work out transistor loop timings and I understand how the Amplitude Modulation system works. Current thoughts/plans (if you can call them that) are an audible tone switching a secondary transistor loop from high (no resistor in series) to low (resistor in series) power and back. The secondry loop will be switching at the target frequency.
Posted by andy 11 years ago | last reply 11 years ago
Asked by The_Saint 9 years ago | last reply 9 years ago
The capacitor circled in red
Asked by cccp3 2 years ago | last reply 2 years ago
Hi, i want to make a device, please tell me how... there is something that looks like a tv remote . it has 9 buttons on it. And there are 9 light bulbs. when i press each button, each of the 9 light bulbs should light up. for example, when i press button 1, light bulb 1 should light up. when i press button 2 , bulb 2 should light up, button 3 turns on bulb 3, and so on. this needs to be wireless. i have done some research and i have found that i need something called an RF transmitter and RF receiver. I just need some hints on how to make this device. i hope it is clear what i want , english is not my first language, if its not clear let me know and i will clarify.
Posted by create90212 10 years ago | last reply 10 years ago
I want to place a device inside a close enclosure. The device in on warranty, so I don't want to take it apart. The device works with a remote control, so I was wondering if there is an easy way to mount another IR receiver that will pick up the signal and sent the to a IR emitter via wire. I can't place the device close to one of the sides of the enclosure and open a hole for the IR receiver. I hope make sense what I'm trying to do. Thank you for your help in advance.
Asked by newtonn2 9 years ago | last reply 5 years ago
Hi ! I'm working on a Tech Project and I need a wireless video transmitter. A webcam or any video camera provides a video stream, my computer receives it. I've searched on the Internet but I've only found shopping solutions. There are different way of transmitting which seem to be efficient : - IP - Wifi I want to make it by myself => build the transmitter and the receiver, connect the transmitter to the video camera, connect the receiver to the computer to collect the video stream. This is a project for my engineering school. Is it possible and affordable for 100€ ? What do I need ? Thanks
Posted by CedricA2 3 years ago | last reply 3 years ago
Hi all, Here I have a small and simple FM transmitter based on a simple transistor oscillator, however, due its simplicity, is weak for my needs: I need to transmit the signal to a distance of about 33 feet. Notice that I will use the transmitter in a rural location and around the building there are no other houses, so I will avoid the risk to cause interferences to other people. Well, so I was thinking to implement an amplification stage, after the transmitter, and I ended up with the following schematic: http://s23.postimg.org/5o8kycjrv/Oscillator_and_Amplifier.png On the base of Q1 I have a female jack where i get the audio signal from an MP3 player. However I have some doubts about resistors values for the amp stage: these values seems too much great to me: I get the Transistor values (BFR36) from the datasheet: http://www15.zippyshare.com/d/nmSyQm6e/625003/BFR36.pdf and I calculated the values here http://www.vk2zay.net/calculators/transistors/bjtBiasing.php (choosing "desing given emitter voltage") The power supply, as shown in the schematic will be equal to 12 V DC. But as I've said I'm not very convinced of resistors values for the amp stage, which seems too much greats. On the other hand, due to the fact that the amp stage is an emitter follower, it will just amplify the current and not the voltage: would be able to give a decent boost on the signal output? What I can expect? Thanks.
Asked by akopelumenuscu 2 years ago | last reply 2 years ago
I need a small compact and light video transmitter, but i dont want to empty my wallot... because i need to buy a ,motorbike, anyway, is it possible to build a simple ish one, that sends video and audio, or just video i dont really mind about the audio, but not very complicated? i just need a range of ~60 metres... thanks
Asked by amando96 9 years ago | last reply 3 years ago