fm transmitter

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 

Question by modtrend 


FM Transmitter

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!

Topic by ericb1   |  last reply


long range Transmitter ?

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 :)

Question by fox.sadik   |  last reply


Simple AM transmitter

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.

Topic by andy   |  last reply


Bathroom Occupied Transmitter

Newbie here... greetings! I work in office building with about 20 guys, most heavy coffee drinkers... we have one-holer restroom which is located about 100 feet and around a corner from the area where the majority of the guys work. Needless to say 8 out of 10 times you make the journey to go to use the restroom, someone is in there with the door locked... leaving you constantly defeated and having to go badly.. I want to create a light or a signal viewable in our common room that would indicate when that bathroom is in use. There is one light switch in the bathroom which operates the overhead light and the fan... and the fan is extremely loud so we always turn the light off when exiting the bathroom.  So my thought is to add some sort of transmitter to the switch that when turned on would send a signal to a receiver down the hall in the common room and that receiver would turn on a small light somewhere in the room. The guy next to me has a nice lava lamp and has volunteered it's services as the bathroom indicator. I'm hoping to find a transmitter or replacement switch/transmitter combo that can be wired into the existing single switch box (no batteries to change). This is what I need help locating.  It would need to perform it's current duties.. turning on the light and fan, as well as send the "on" signal and "off" signal to the receiver 100 feet away.  I think the other solution would be to run a wire thru the ceiling from the switch, but was hoping to avoid that. Thanks in advance for your help!

Topic by treetop1500   |  last reply


AM transmitter design ??

Is it better to use a diode for DSB SC modulation for good range ? or it's better to use npn transistor ?

Topic by walidj   |  last reply


usb to fm transmitter

 Hi, I am a very big noob to wiring. For a present, I wanted to make my cheap old AAA powered fm transmitter into a usb powered one.  Thinking I was so smart, I cut up an old usb cord and soldered the red to positive and black to negative. It worked great until it started melting the transmitter.  So I now I realize that usb is much more powerful than 2 AAAs.  heh heh. I found this: www.instructables.com/community/USB-to-Travel-Clock-Circuit-Help-/ but it's a bit over my head.  I'm assuming I need to get a capacitor or voltage divider but I could use a little help breaking it down into noob speak.  Plus the transmitter is a little thing, 2 inches, is there a smaller way of checking the voltage? K, thanks bye!

Topic by audrywolters   |  last reply


Infrared transmitter and receiver

I want to make a gadget which sends a few kb of data via infrared and also receives data via infrared with a timestamp. However, I am stuck as I have only used arduinos before and I have to design a circuitboard which I have never done before, with PIC microcontrollers (must be cheap ones). I need help a) choosing a microcontroller and b) assembling all the components into a circuitboard (ir transmitter, receiver, microusb port to transfer data to pc, battery). Gadget will eventually be portable so make everything light. Thanks Khalid

Topic by khabro   |  last reply


how to write specification for transmitter?

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 ?  

Question by vead   |  last reply


need info regarding replacement items in circuit.....

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

Question by JJK6   |  last reply


how make wireless transmitter?

How make wireless transmitter?

Question by Apache4690   |  last reply



Electricity Transmitter and receiver. is there anything such as that.

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

Question by pkataria1   |  last reply


HDMI wireless AV transmitter/receiver homemade

Does anyone know a way to make a wireless transmitter in hdmi format? this is for going between computer and monitor. I cant find a single schematic.

Topic by FLskater3696   |  last reply


RW67tx-na03 200607-001 video transmitter

Want to connect a 2.4 Ghz RW67TX-Na03 200607-001 to a camera with VDD and GND Video. But I can not find a wiring diagram. please help !!!!!

Question by Dannne11   |  last reply


How to eliminate noise in FM transmitter? Answered

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.

Question by Rajkumar2506   |  last reply


Is there any way to make a long range video transmitter? Answered

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.

Question by kjjohn   |  last reply


Help with Receiver/Transmitter and attaching motors?

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?

Question by gotparsley   |  last reply


Help me selecting antenna for my fm transmitter????

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

Question by Atul009   |  last reply


how i can make a circuit of FM transmitter in range of 5 Km.?

PLZ help me to make a FM Transmitter in the range of 5 Km. with a easy way

Question by fine   |  last reply


Diy radio transmitter for medium range, 1 mile

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. 

Question by jjefferson1   |  last reply


How can I hook up this capacitor for an FM transmitter? Answered

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

Question by pennsteve   |  last reply


Can anyone design a device that would interfere with cars stereos within 10 feet or more? Answered

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

Question by scalin6   |  last reply


Modulate a transmitter with a signal generator? Answered

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.

Question by akopelumenuscu   |  last reply


replacement transmitter for an rc helicopter?

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?

Question by mammasboy   |  last reply


Simple radio transmitter question Answered

I am interested in building a small low powered radio transmitter. Searching the Instructables website I found some Instructables that have some with oscillators: Build a very simple AM Transmitter Make Your Own Low-Power AM Radio Transmitter Some other projects are built with timer chips and transistors: 555 AM Transmitter Easy AM Transmitter! Would someone please explain the theory or science, and advantages or disadvantages of the components involved when building each project? Thank you very much.

Question by blkhawk   |  last reply


Ramsey tv6c vhf transmitter

I have been working on a Ramsey TV transmitter since Christmas. the best i can get is very static gray/black picture with no sound. just dark static. I checked everything thousands of times. what can be the problem? could i have burnt up a component with my solder iron? i ended up broking the cheap plastic tuning tool that came with it by adjusting everything way too much.i can still tune it with my fingers and matches/toothpicks

Question by -max-   |  last reply


iPhone, IR transmitter for Heli?

Hello all, does anyone know how to make IR transmitter for heli? You can look at here what I mean: http://www.ihelicopters.net/ I already have such heli at home, also apps is free, I don't know how transmitter works, but I thinks it's just audio->IR->heli any ideas, suggestions? thanks

Question by mcride   |  last reply


Boosting Fm transmitter range

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.

Topic by thejrb   |  last reply


How to build an FM transmitter? Answered

I want to start my own temporary radio channel. Well me and my friends plan to do it, so first we need a FM transmitter, so i was wondering if anyone of you could help me out. I am good at implementing circuits on PCBs and making circuits in general, so i dont think making one should be such a big problem, but the problem is i dont know how to make one, so needed help with that. If there is already an instructable please link me to it because i've not been able to find one.  Thanks! :)

Question by ankur2893   |  last reply


Remote control transmitter and reciver?

I saw a instructable on how to get free eletronics and need the number of a 4 channel variable speed transimtter and reciver (for example 555 is a timer) preferabley 27 MHZ. If you know the part number please post it in comments. Thanks David.

Question by David97   |  last reply


FM Transmitter with voice recorder.

This is what I would like to have made. I see these in spy websites for cheap. I don't want to spy on anyone but need for for another reason. Can anyone here on this site point me in the right direction. It's a short range FM Transmitter that has a built in voice recorder for up to 4 minutes made. The recorder would have a simple button that you would press to record with a built-in mic and small speaker for playback. The recording when transmitting would loop forever. The unit would be powered by a small battery and solar panel or just solar panel if that would work both indoors and out. The unit would only have to transmit during daytime hours. I would need the FM Transmitter to transmit no more than 100 feet and to meet FCC for USA. The transmission would need to be a very clear transmission because it is going to be used for advertising. It does not need to be in stereo. I've attached an image of what I would like to have made and the case is available at http://www.polycase.com/ Thanks Gregg

Question by greggsudduth   |  last reply


Why cant I make FM transmitters?

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?????

Topic by HavocRC   |  last reply


How to make a fm transmitter without amplifier? Answered

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.

Question by jumper1111   |  last reply


how can i build a pocket sized transmitter?

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?

Question by jmatthew408   |  last reply


How do you connect a servo to an RC transmitter?

I am connecting servos to an RC plane I am building but I don't know how to connect the servos. Please Help!

Question by chanman789   |  last reply


Question about Flysky fs-TH9x Transmitter + Receiver?

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?

Question by rptech   |  last reply


I want to build/ buy a cheap audio transmitter setup?

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

Question by PyroTrician95   |  last reply


50-800Mhz VHF TV Signal Transmitter for receiving TV Channels on Chinese Mobile Phone?

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.

Question by shad0w88   |  last reply



I can't find this capacitor. What do I do? Answered

The capacitor circled in red

Question by cccp3   |  last reply


how to make this device?

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.

Topic by create90212   |  last reply


555 Am Transmitter Circuit Diagrams?

I have two ICM7555 CMOS 555 timers, and I was wondering if anyone has any good am radio transmitter circuits that incorporate two (or one!) 555 timers.?

Question by BurningSandman   |  last reply


Help DIY Wireless Video Transmitter

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 

Topic by CedricA2   |  last reply


RC transmitter/receiver technical questions

I have a few questions regarding the data rate of normal RC transmitters. Roughly how often does the processor in the transmitter scan the inputs? Each individual channel only operates at around 50/60 Hz, can this easily be increased? I've heard that there are digital servos operating on a frequency significantly higher than 60Hz, do they still operate on the same 60 Hz input? How noticeable would a refresh rate of 5Hz be in the position of the servo when it is in use on a performance model (i'm told that a program the executes in 1/10th of a second appears instantaneous)? Can a 100% duty cycle pulse be supplied to a servo to make it move faster, if the correct position signal is supplied when it reaches the right place? Thanks for any replies. (does anyone know where to find the pinout for the nvidia gt330m graphics card)

Topic by The Skinnerz 


The best way to boost an RF transmitter?

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.

Question by akopelumenuscu   |  last reply


Need some decisions on what rc transmitter and receiver to buy?

I want to get started in rc robots,car,planes...... but i dont know what rc transmitter and reciever to buy. Some of the fethures i wanted it to have was 6ch,4-6 degrees of freedome and a price ranging around $50-$110. If it could be bought at amazon.com or servocity.com then that would be great. Please give me some advice

Question by fire_kid   |  last reply


Is it possible to create a speaker wifi receiver and a separate transmitter?

I was wondering if it's been done or if anyone can do this. I have two outdoor speakers that have the negative and positive audio cables. I wanted to somehow connect them both to some kind of adapter that would connect them to a wifi connection and transmit sound to it. I'm open for many different ideas. Thanks. P.S. I can use my computer as a transmitter if it's possible.

Question by aschmois   |  last reply


Can anyone help me build a FM or AM transmitter and receiver?

I found on the www many schematics but not togheter. I want to be a good and a stereo transmitter and receiver. Can anyone help me with a schematics for the both? I need with easy to find and cheap components, because i dont have many money, thats why i want to make and not to buy.

Question by danyelo   |  last reply


Can I use a USB webcam for a diy Video Transmitter? Answered

Hi guys,I am making a video transmitter from scratch. The schematic I am using says "NTSC input". What connection would that be? I was hoping I could use a USB web cam for the camera. But I do not know where the pins would connect on the USB port... I wonder if I need to use my digital camera, with the video cord connected to a jack on the board. Thanks in advance, for any help.?

Question by Jojo007407   |  last reply