Introduction: Super Yet Simple FM Transmitter Circuit
Welcome to my instructable. Actually this FM Transmitter 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.
You can read books on Amazon
Step 1: The Circuit
I found this circuit and decided to start building it.
Step 2: Components
Part Total Qty. Description Substitutions vendor
L1, L2 2 5 Turn Air Core Coil I'll show you how I made them in the next step
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 FM 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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