Build Your Own Crude FM Radio

Introduction: Build Your Own Crude FM Radio

About: Awesome Electronics Tutorials, Projects and How To´s

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 (affiliate links).

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

Aliexpress:

1x LM386: https://s.click.aliexpress.com/e/_d7zbzub

1x 10kΩ, 1x 4.7kΩ Resistor: https://s.click.aliexpress.com/e/_dTPpXjt

1x Variable Capacitor (1-30pF): https://s.click.aliexpress.com/e/_dWVcswb

2x BF199 Transistor: https://s.click.aliexpress.com/e/_dYRkUBl

1x 25kΩ Potentiometer: https://s.click.aliexpress.com/e/_dTFyPv5

2x 100nF Capacitor: https://s.click.aliexpress.com/e/_dU4FEsB

1x 10µF, 1x 470µF Capacitor: https://s.click.aliexpress.com/e/_d7dOwRz

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?...

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

7 People Made This Project!

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25 Discussions

0
Kishok Kishok
Kishok Kishok

6 months ago

What is the ic that I should use to have a good signal in Asian countries?

0
Kishok Kishok
Kishok Kishok

6 months ago

What is the max and min input voltage?

0
praneshgowtham005
praneshgowtham005

2 years ago

where do you bought the inductor and what is the inductor value .anyone please give me answer

0
EleyA
EleyA

Reply 2 years ago

use a gauge sixteen wire and coil it around a 4mm rod, screew or anything :)

The LM386 not going to work if you are far from the radio tower - maybe in the country like europe and the USA it will be working perfectly but in country like Africa, Asia and Eastern europe where radio technology are not so advance this circuit simply fail.

0
shankaarshiva
shankaarshiva

2 years ago

I made it but it doesn't pick up any radio stations. It once picked up but it was high pitch and too soft to hear, Oh by the way, i guess the problem was with the antenna

0
PansiluJ
PansiluJ

3 years ago

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.:)

0
LenarOX
LenarOX

Reply 2 years ago

s9018 or s9014

0
BenW110
BenW110

Reply 3 years ago

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

0
noboy007
noboy007

2 years ago

This circuit diagram makes little-to-no sense and the out of focus pictures don't help. The parts list is inaccurate and does not clearly list the supplies needed. For example you have not listed the voltage or type (IE: Ceramic Capacitor vs regular capacitor.) I know this is an old project, but if you could would you possible upload an updated PCB board diagram and 'adjust' the parts list.

Thanks.

0
ChandrahaasV
ChandrahaasV

3 years ago

Can you explain how you made the antenna?

0
FelipeC115
FelipeC115

3 years ago

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 :)

0
HackShack
HackShack

3 years ago

Will a pn2222 work?

0
HackShack
HackShack

3 years ago

Receivers can't cause interference. You are fine!

0
thatguy900
thatguy900

4 years ago

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

0
manuTheLeuzi
manuTheLeuzi

Reply 3 years ago

by adjusting the capacitor C1