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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

<p>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. </p>
<p>BF199 and all other &quot;BF&quot;(NPN Si) transistors are not available in my country.what i can use that?any substitude?<br>or can i use BC337,BC549 or BD135 transistor?</p><p>if u can tell me that it would be awesome and this is awesome project indeed.:)</p>
<p>these guys send to anywhere in the world :D </p><p><a href="http://www.ebay.co.uk/itm/BF199-NPN-Medium-Frequency-Transistor-Pack-of-5-10-or-20-/162000055567?var=&hash=item25b7f4ad0f:m:m8yF2HCg3Hyszej_X5lQQBw" rel="nofollow">http://www.ebay.co.uk/itm/BF199-NPN-Medium-Frequen...</a></p>
<p>I think they have to be &quot;BF&quot; 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.</p><p>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</p>
<p>Hi Scott,</p><p>Its been hard to find the parts. Are there alternatives to LM386 and BF199?</p><p>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.</p><p>Thanks :)</p>
<p>LM386 cheapest i can find: </p><p></p><p><a href="http://www.ebay.com.au/itm/10PCS-IC-LM386N-LM386-AMP-AUDIO-PWR-MONO-8DIP-GOOD-/191736127737?hash=item2ca45d20f9:g:X6QAAOSwJb9WrvKo" rel="nofollow">http://www.ebay.com.au/itm/10PCS-IC-LM386N-LM386-A...</a></p><p>BF199 cheapest i can find: </p><p><a href="http://www.ebay.co.uk/itm/BF199-NPN-Medium-Frequency-Transistor-Pack-of-5-10-or-20-/162000055567?var=&hash=item25b7f4ad0f:m:m8yF2HCg3Hyszej_X5lQQBw" rel="nofollow">http://www.ebay.co.uk/itm/BF199-NPN-Medium-Frequen...</a></p><p>hope it helps :D</p><p></p>
<p>Will a pn2222 work?</p>
<p>Receivers can't cause interference. You are fine!</p>
<p>hey just wondering how you can tune the radio to different frequencies?</p>
<p>by adjusting the capacitor C1</p>
<p>do we make the coil?</p>
<p>watch his video</p>
<p>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.</p>
<p>can any 1 post the pcb layout of this???</p>
<p>Easier but not cheaper to do with a raspberry pi - although you can use the Pi for other things afterwards.</p><p>Beware you don't upset authority by interfering with commercial broardcasts. </p>

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