FM Transmitter How To Build Circuit DIY Homemade. Long range home made transmitter radio station.

[@henkh2385]

I've build this 50 years ago. I am amazed it is still around :)

[@inspiresoundpro]

Yes this design has been around for ages. I built my first one back in the 1980's. Its such a great starter circuit that you can learn so much from. Not only do you get to learn basic electronics but you end up with a functional and totally fun transmitter that is just hours of pleasure to use. For the new radio presenters, as so many of my viewers are, this can be perfect for having their friends and family in their house listen to their first radio shows. I have built so many of these over the years that I don't know what I enjoy most, building it or playing with it. So much fun. I hope you decide to build another one again. Cheers :)

[@Slugg-O]

It's a cool project. I'd give it an A for the cool factor and an F for assembly

[@inspiresoundpro]

I agree with A for the cool factor but I think an F for assembly is a bit harsh considering that there is no printed circuit board. I would say a good C+ to B considering what it's made from. Cheers :)

[@Slugg-O]

@@inspiresoundpro Someone did a great job with the design and initiative. Can't take anything away for that. It's the solder and wax that gets the F. Just my opinion though At least he built one. I just watched. Still a good video.

[@inspiresoundpro]

@@Slugg-O Agreed especially about the wax but I have seen much worse soldering on KZbin so I still give it at least a C. :)

[@fishloversaai3362]

Its a really gread project but can you say how to comnect a speaker's instead or an audio out put cable.?

[@inspiresoundpro]

It's a transmitter not an audio Amp so there are no speakers. If you want to hear the audio going into the transmitter you will need to connect another mini jack socket to the audio input of the transmitter in parallel. Then you can plug your headphones into that. Hope that helps. :)

[@fishloversaai3362]

@@inspiresoundpro sorry sorry not a speaker my bad, a microphone like a condenser

[@inspiresoundpro]

Lol no problem. Yeah the idea is this transmitter is for a home radio studio transmitter. So you should use a little audio mixer. That way you can play music and talk on the mic. There are lots of fm transmitters on KZbin with a built in mic so this kind of transmitter is more rare. This one is more fun if you use an audio mixer or computer output.

[@mikachigi]

Seems simple enough :D I just might build it for the fun of it :D

[@inspiresoundpro]

Yeah I love building these little FM circuits. They actually sound pretty good too. I like this circuit a lot because it doesn't have a microphone connected like so many FM circuits on KZbin. That makes it more of a radio bug than a transmitter. With this circuit you can plug in your little studio and have lots of fun. Enjoy. Cheers :)

[@rayyanibnnaveed6805]

Hi! Can this built on a breadboard?

[@inspiresoundpro]

Yes you should be able to. I have not done it but it should be possible. You would have to rearrange a few of the connections and double check it but in principle it should work the same.

[@rayyanibnnaveed6805]

@@inspiresoundpro right Thanks!

[@remnyeheh1240]

is there any DIY kit that can be bought and has all of the materials there? Ty

[@inspiresoundpro]

Yeah have a look on Ebay. There are lots of different FM transmitter circuits. From basic learning kits to professional broadcast gear.

[@wildzedrift8641]

Can I use mic instead of that plug?

[@inspiresoundpro]

You will need to use an audio output of a mixing desk or cell phone etc. This circuit is meant for music and home radio station. If you want to use a mic you would need a small mic preamp. There are lots of circuits with mics on KZbin so this one is different.

[@husseinbazzi340]

Hey I might use this for a final project. can you please name the capacitors and other relevant parts please like the actual part number

[@inspiresoundpro]

Hi all the parts are listed in the beginning of the video. Cheers.

[@RoboticsEngineer1622]

Could you make a circuit which transmits a video signal and also a receiver? I'm really interested in this field because of FPV and robotics applications but I'm more experienced in programming than in circuit design and signals. Left a sub here for you :)

[@inspiresoundpro]

I like the idea of a video transmitter too. It is much more complicated though because the signal needs a multiplexer that makes it a lot more difficult. I will keep it in mind for the future but I will have to see how to make a bit more basic. Thanks for the sub :) and thanks for your comment .Cheers.

[@RoboticsEngineer1622]

@@inspiresoundpro I understand, perhaps I'll give it a try myself :D Where did you actually gain your knowledge about electronics? Gonna stay up to date about your uploads :)

[@inspiresoundpro]

Only saw your comment now lol. I studied electronics and worked as an electronics technician for years then moved onto broadcast so my knowledge crosses over between electronics, transmitters and presenting. I guess that is kind of reflected by the videos I make lol :) Cheers.

[@RoboticsEngineer1622]

@@inspiresoundpro no problem :D I'm also studying electronics ( actually its focused on hardware and RF technology ) Thank you for your response!

[@MrNicetux]

What's about the range?

[@inspiresoundpro]

This transmitter as it is now can have a longer and shorter range depending on whether it is used indoors or outside. Inside a house it will probably reach about 30 meters but outside can probably reach about 100 meters. If the antenna is changed it can probably reach up to one mile outdoors. I will have another video soon showing how to change the antenna to make this transmitter long range.

[@illa-noisemusic1081]

@@inspiresoundpro With higher wattage? How bout 15 watt?

[@inspiresoundpro]

This transmitter is a very low power transmitter of probably only 30 to 100 mw. A higher power transmitter with 1 Watt or more will have a much longer range but it still depends on the antenna height and type of antenna. Often the antenna height will make way more difference to the signal range than the signal power. Often the signal power only helps to fill in the signal area or footprint but the antenna height can make a huge difference. For example a 1 Watt transmitter at 20 Meters high will have a much much longer range than a 20 Watt transmitter at 1 Meter height. So although the power of the transmitter does have an impact on the range there are other things to keep in mind too.

[@vitoriaaguiar3379]

Can use a trimmer capacitor 2-10pf instead of a 2-22?

[@tonywright8294]

NO it’s against the law in your country , don’t do it you have been warned

[@neilfairbairn3775]

I wouldn't advise building this as you need licences to build and test radio transmitting equipment. You'd also need to have a broadcast licence, especially if you are playing music.

[@inspiresoundpro]

That depends on the laws of your country. Many of these low power devices fall into similar categories as FM devices they can buy such as car FM transmitters and mobile device transmitters. Each country has their own laws regarding this so I always try advise people to know the laws of their country first. I don't give legal advice and this is not legal advice. That is why there is a disclaimer both in the video and the description.

[@MaxQ10001]

There must be an error in the circuit diagram. The thick wire says both GND and -9V. There doesn't seem to be ay negative voltage, so I think GND is correct.

[@inspiresoundpro]

Yes I think the circuit was intending to show the negative voltage as a the earth or negative side and not minus 9V. I think this has more to do with that a 9V volt battery is used which would have a negative symbol but not actually mean a negative voltage because that would imply a 18V difference which this circuit probably cant handle. Thanks for pointing that out. Always helps to have extra eyes looking at it. Cheers. :)

[@paulov9626]

You mentioned nothing about drift. With such a simple LC oscillator and non temperature compensated components, and no drift compensation like a phase-locked-loop, there will be both short term and long term drift. Last thing a beginner needs is having to re-tune the receiver (or transmitter) every so often and wonder what is wrong. So bottom line, not a great circuit.

[@inspiresoundpro]

Thank you for your comment. It really helps beginners to see this kind of information shared. You are right this circuit will drift and a PLL circuit is better. That said I completely disagree that this is not a great circuit. This circuit was not intended to be broadcast quality or anything close to it. This circuit is a cheap easy fun circuit to build that gives learners an Immediate experience with FM circuits. In fact one of the best ways to learn about drift is to experience it. This is a learning circuit and it's a great one at that. Thanks for sharing your thoughts. It's of great benefit to the viewers. Cheers.

[@alancooper9348]

100% disagree. If you're put off by that then playing with electronics isn't for you! This is a perfect beginner circuit, I built a variation of this myself as a kid back in the 80s, we had fantastic fun broadcasting our own pirate radio stations to school friends! There was much rivalry on the airwaves, pushing this insanely simple circuit to the limits, trying different transistors, making dipole antenna in the roof, and cranking up the supply voltage until the transistor was getting toasty... with an admittedly weak signal we had these transmitting well over a mile, Sure, it drifted a bit, never gave that a second thought as it was far, far outweighed by the total coolness of this circuit! :-D

[@tonywright8294]

Don’t use lead free solder it’s crap .use leaded

[@inspiresoundpro]

Can't say I have ever used lead free solder but I can imagine that the lack of lead would make it crap. Thanks. Always good to have helpful tips :) Cheers

[@karmitfrog7968]

make video about diy fm receiver with adjustable knob and how to boost your fm am receiver signal

[@inspiresoundpro]

Yeah I have been thinking about building a receiver. The receiver preamp is also a great idea. The only problem is that most receiver preamps create a lot of extra noise. A really good one can be expensive. I will work on the FM receiver though. Thanks for your input. Cheers. :)

[@Quick-BitScience]

@@inspiresoundpro Would be great if you can make a design with common transistors, tried to make one from a schematic from electroschmatics all I could hear was static and it would never tune. Rally a big fan of this video