How to make an FM Transmitter

In today's video, we learn the basics of FM Radio transmission and how to make a FM radio Transmitter. The most proactively use I can think of for this is just as a device to play music from your phone on your car's radio, although the principal could be scaled up, it is likely illegal without a radio license to broadcast to a large area. So yeah! Thanks guys! :)

List of Materials:
0. Transistor (Q1)- S9018.
1. R1- 2.2K
2. R2- 22K
3. R3- 2.2K
4. R4- 33 Ohm
5. R5- 33 Ohm
6. C1- 0.1uF(Code- 104)
7. C2- 0.1uF (Code- 104)
8. C3- 680pF(Code- 681)
9. C4- 30pF-120pF variable Capacitor
10. C5- 10pF(Code- 10)
11. C6- 30pF(Code- 30)
12. C7- 30pF(Code- 30)
13. C8- 0.1uF(Code- 104)
14. Inductor(L)- 0.1uH (5.5Turns coil).
15. Antenna- A short wire, 20cm long.
16. PCB
17. 9V battery terminal
18. AUX port/ jack

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music: Wallpaper, Kevin Macleod

Licensed under Creative Commons: By Attribution 3.0
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Snapchat: keystonescience
Twitter: @Keyst0neScience

[BenBelanger]

Seen this before, but nobody actually explained why it works, just how to make it. thank you very much keystone science. Good video.

[larrylentini]

I was wearing a home made ring made when I happened to spill acid on my hand. Classic mistake.

[MrRoboticWarfare]

Heya, Keystone! Another fantastic video.

I was wondering what level of mathematics/physics/signal processing you've been through. I can't quite tell whether you know the equations or if you're finding them off of wikipedia or the like. If you are in fact recalling the equations from academic experience, I'd love to see a greater theoretical expansion of some of the circuit behavior! Thanks!

[markvandesande]

This reminds me of being 10 years old building radio transceivers. Difficult crystal sets. 1980 was a great year in the uk for amateur radio/CB. keep up the great work. Just a tip slow down just a touch for us older ones.😃

[bithack]

This is a great style for your videos. I like the detail you went into on this project and the mini-tutorial in prototyping on a breadboard.

[mysticalaria]

yes this is one of the best channels i have.. The "core" components you describe are of vast help to those trying to get into this field and i thank you for the time you spend to help us.

[Willam_J]

If you're having trouble seeing the waveform of the oscillator on your scope, use the X10 setting on your scope probe. The X10 setting reduces the loading on your oscillator and will not only make it easier to see, it won't load down the oscillator and detune it as much.

[officer_baitlyn]

your content is helping me alot
i am currently learning about electronics and math as my main courses and electronics got kind of stale really fast
channels like yours make alot of people curious enough to invest time into the subject
great work keep it up :^))

[mannyquinn]

cheers man! but just a quick question, does increasing the power input to the reciever increase the signal range.

[Kevin-lhxu]

Good job :) keep up the good work and that was a cool project i might try it when i get the parts i need. Your subs are growing exponentially you will get a silver play button in no time

[ohmslaw]

You forgot to mention to scrape the ends off the coil; must have enamel on the outside of the copper..
Also @4:25 inductor is missing

[TechnoWzard]

What gauge wire do you use for the coil inductor? I know those breadboards are fairly standard but don't recall what diameter wire off the shelf is right to use for them.

[jackdampier]

great video overall with good demonstration of breadboard connections.i tried successfully to make the transmitter. the only thing i didn't like about the video was lack of information about how to locate the frequency on the fm receiver.

[thewolfin]

Isn't the sleeve of the TRS connector the ground? I thought it went Right, Left, Ground from tip to sleeve?

Just looked it up and apparently older Nokias and Samsungs have it the way you mention in the video. I actually like that pinout more as the ground is probably the first thing to make contact with the receptacle.

[babbalgts]

this channel is scientifically of course!!!😊😊😊

[Djob]

It's depressing that i now have a playlist filled with a load of your videos which I want to attempt one day

[bobbyblue]

this guy half my age building his own transmitter and I can't even get my own Haynes 'build your own fm radio fun kit!' working.

[TroyPowersPowerfulInnovations]

Very neat. I subscribed to you a while back and have enjoyed your weekly videos! You have some great ideas!

[derknistermann]

nice video, sir! But i would like to know what diameter the screw has...

[MrBribon]

After watching your videos I came to a very simple conclusion. I need a garage T_T