Welcome to my instructable. Actually this instructables is from the past. It is actually from the year 2001. I saw the pictures and files so I wanted to reconstruct it as a useful instructable.

I'll be adding so steps and photos. So stay tuned.

You can read about this project in Arabic on my blog Here


In 2001 I decided to build my own FM transmitter. I didn't look for something fancy or very long range. I started to look for a working circuit inside books on the university library but no help.

I found large circuits with complicated designs. I even had no guarantee that they will ever work. So I've decided to go online and search for something that is already tested to be working.

So I've decided to build it.

Step 1: The Circuit

I found this circuit and decided to start building it.


Step 2: Components

Part Total Qty. Description Substitutions vendor

C1 1 0.001uf Disc Capacitor Amazon, eBay

C2 1 5.6pf Disc Capacitor Amazon, eBay

C3,C4 2 10uf Electrolytic Capacitor Amazon, eBay

C5 1 3-18pf Adjustable Cap Amazon, eBay

R1 1 270 Ohm 1/8W Resistor 270 Ohm 1/4W Resistor Amazon, eBay

R2,R5,R6 3 4.7k 1/8W Resistor 4.7K 1/4W Resistor Amazon, eBay

R3 1 10k 1/8W Resistor 10K 1/4W Resistor Amazon, eBay

R4 1 100k 1/8W Resistor 100K 1/4W Resistor Amazon, eBay

Q1, Q2 2 2N2222A NPN Transistor 2N3904, NTE123A Amazon, eBay

L1, L2 2 5 Turn Air Core Coil I'll show you how I made them in the next step

MIC 1 Electret Microphone Amazon, eBay

MISC 1 9V Battery Snap, PC Board, Wire For Antenna Amazon, eBay

Step 3: The Coil

I made the coil from a thin insulated copper wire. I got the wire from an old destroyed transformer.

Then turned on a pen tube. This is a very simple step. You just need to make 5 turns of wire over the pen tube, then cut the wire.

You need to solder the coil into the PCB and at this process the coating on the copper wire will be removed. So you don't have to worry about the thin insulation around the copper wire.

Step 4: Connect the Circuit and Test

I connected the circuit on a piece of copper perfboard and installed it inside an old Cassette Tape box.

You can see the 9V battery connector and the variable capacitor knob.

Now you can test the circuit by connecting the MIC and talking into it. To receive the signal, you need a standard FM Radio Receiver.

You need to tune the Receiver and the Transmitter by trial and error until you get the signal.

The range of this transmitter is about 90 meters.

Thank you for reading my instuctable

Here is the article in Arabic on my blog.


Thank you for reading my instructable.

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About This Instructable




Bio: Embedded Systems Engineer. Love to travel , run , design useful stuff and grow green plants. I joined instructables.com on 2008 and my first instructable was ... More »
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