Introduction: Build Your Own Crude FM Radio

In this project I will demonstrate how a RF FM transmitter works and how this principle compares to the older AM. I will also show you how to build a simple and crude FM receiver which can even sometimes let you listen to your favorite radio stations. Let's get started!

Step 1: Watch the Video!

The video gives you plenty of information about how FM and AM radio signal communication works and how the receiver circuit performs. I will present some additional information for the receiver in the following steps.

Step 2: Order Your Parts!

Here you can find a parts list with example sellers for your convenience.

Amazon.de:

1x LM386: http://amzn.to/1PkTgbX

1x 10kΩ, 1x 4.7kΩ Resistor: http://amzn.to/1A2KZzi

1x Variable Capacitor (1-30pF): http://amzn.to/1PkTwYi

2x BF199 Transistor: -

1x 25kΩ Potentiometer: http://amzn.to/1IrYFpR

2x 100nF Capacitor: http://amzn.to/1IrYXgf

1x 10µF, 1x 470µF Capacitor: http://amzn.to/1IrZ4Ze

Amazon.com:

1x LM386: http://amzn.to/1Oo2iUa

1x 10kΩ, 1x 4.7kΩ Resistor: http://amzn.to/1Oo2mmI

1x Variable Capacitor (1-30pF): http://amzn.to/1Tlg49S

2x BF199 Transistor: http://amzn.to/1Oo2t1M

1x 25kΩ Potentiometer: http://amzn.to/1Oo2y5p

2x 100nF Capacitor: http://amzn.to/1TlgaOO

1x 10µF, 1x 470µF Capacitor: http://amzn.to/1Oo2GlB

Ebay:

1x LM386: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 10kΩ, 1x 4.7kΩ Resistor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Variable Capacitor (1-30pF): http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x BF199 Transistor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 25kΩ Potentiometer: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x 100nF Capacitor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 10µF, 1x 470µF Capacitor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Aliexpress:

1x LM386: http://s.click.aliexpress.com/e/zJYvvv3fm

1x 10kΩ, 1x 4.7kΩ Resistor: http://s.click.aliexpress.com/e/Iea2RjqnY

1x Variable Capacitor (1-30pF): -

2x BF199 Transistor: http://s.click.aliexpress.com/e/M7IY33Bi6

1x 25kΩ Potentiometer: http://s.click.aliexpress.com/e/EeeyFAyVn

2x 100nF Capacitor: http://s.click.aliexpress.com/e/33BeyvFyF

1x 10µF, 1x 470µF Capacitor: http://s.click.aliexpress.com/e/QJEuFYZv7

Step 3: Build the Circuit!

Here you can find the schematic and two pictures of my finished FM Receiver. Use them as a reference to build your own.

Step 4: Success!

You did it. You just built your own crude FM Receiver and learned something about RF communication.


Feel free to check out my YouTube channel for more awesome projects:

http://www.youtube.com/user/greatscottlab

You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information:

https://twitter.com/GreatScottLab

https://www.facebook.com/greatscottlab

Comments

author
ChandrahaasV (author)2017-06-12

Can you explain how you made the antenna?

author
fpalmer made it! (author)2017-05-10

I used a much easier transistor to find. the s9018 . aside from that, everything was virtually identical. i used a 5uF capacitor for tuning and a 22uF fixed capacitor.

WIN_20170510_07_58_10_Pro.jpg
author
PansiluJ (author)2016-12-10

BF199 and all other "BF"(NPN Si) transistors are not available in my country.what i can use that?any substitude?
or can i use BC337,BC549 or BD135 transistor?

if u can tell me that it would be awesome and this is awesome project indeed.:)

author
scratchndent (author)PansiluJ2017-03-19

these guys send to anywhere in the world :D

http://www.ebay.co.uk/itm/BF199-NPN-Medium-Frequen...

author
BenW110 (author)PansiluJ2016-12-29

I think they have to be "BF" labelled transistors, these are designed to work at radio frequencies. However if you can't find BF transistors in your country it may be because they are labelled differently.

an NTE133 should do the job, but many other NTE labelled transistors will not work since it's just a company name so you'll have to look around at datasheets

author
FelipeC115 (author)2017-02-06

Hi Scott,

Its been hard to find the parts. Are there alternatives to LM386 and BF199?

Also, could you please post the whole info on the required parts, for instance when looking for a capacitor there are multiple specs, like voltage and other stuff that I don't understand. As this is my first radio project and I want to dig deeper in the electronics world, this would help a lot.

Thanks :)

author
scratchndent (author)FelipeC1152017-03-19
author
HackShack (author)2017-03-05

Will a pn2222 work?

author
HackShack (author)2017-03-05

Receivers can't cause interference. You are fine!

author
thatguy900 (author)2016-09-08

hey just wondering how you can tune the radio to different frequencies?

author
manuTheLeuzi (author)thatguy9002016-12-07

by adjusting the capacitor C1

author
Bernielol (author)2016-12-03

do we make the coil?

author
manuTheLeuzi (author)Bernielol2016-12-07

watch his video

author
Inblackandwhite (author)2016-04-11

Hey Scott, I was wondering if you could make a video on simple LED, exactly how you made your intro. I would love to make my own signs made out of LEDs. Sorry, but I've never set up LEDs before. Thanks.

author
sravya valavala (author)2016-02-15

can any 1 post the pcb layout of this???

author
rickharris (author)2015-11-29

Easier but not cheaper to do with a raspberry pi - although you can use the Pi for other things afterwards.

Beware you don't upset authority by interfering with commercial broardcasts.

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