For more info, pleas read the FCC Rules.Science4you – Prank Factory: Learn how to make the ultimate pranks and practical jokes with the Science of Pranks. If you want to stay safe and prevent the circuit from burning, solder a 10 ohm resistor in series with the FM transmitter and 12v battery.Īs long as you don't use it to spy on others and not use a long & huge antenna then yes, it's legal. This project would still operate at voltages between 7v-14v, so yeah it's compatible. You can now connect your MP3 player! I'll post an additional step regarding this mod. Now solder a wire from the junction to U1's collector pin (refer to the schematic). Yes, it's possible! All you need to do is to link the common ground then solder a 1K ohm resistor each channel (L & R) forming a junction. Is It Possible To Connect A 3.5mm Audio Jack? If you really can't find one, the famous Little Bits kit comes with it. You'll easily find one from a PC repair shop, or maybe form a hardware store. Where Can I Find A Non-Conductive Screwdriver? This is why non conductive screw drivers are recommended. Let's admit it, tuning the radio is a bloody challenge! If you use a metal screw driver to tune the trimmer cap, chances are you'll end up having a different frequency broadcast the moment you lift the screw driver. Why Does The Frequency Change After Tuning? Don't worry too much, eventually you'll learn to improvise when parts are not available. When I was still a novice hobbyist, I was worried about the strict selection of parts. Only use solid wires that has a thickness of 18 - 22 gauge. I used the yellow since it covers a wider range. Trimmer caps are color coded, only use the Red, Green or Yellow. Most likely, you'll find one from a scrap transistor radios however you can replace it with a 20pF ceramic capacitor then rely on the coil's adjustment for compensation. You don't believe me? The parts from my first non-recycled transmitter came from RadioShack, Long Island, NY branch.Īny Alternatives For The Trimmer Capacitor? If you live in the US, all the parts that I've used are available from Radioshack. Please check for the legality before attempting the project within your area. Neither site nor I, am liable for careless actions. I hope you guys enjoy the vid! Please leave a comment below, I would appreciate some advise regarding the video.ĭisclaimer: This project is for educational purposes only and is not intended to air/ interfere with present radio channels. Please Watch: Celebrating the 1st episode of my new YouTube channel! It's my first time to document a project with videography. > WARNING: You may experience nostalgia! :D<<<<<<< In a nutshell, I highly recommend this project for everyone and also those who are still new in electronics. I'll give some tips on the last step of this instructable. I guess the biggest struggle that you're going to face is finding a trimmer capacitor. At the time I had no idea of where I'm supposed to buy the parts, so I recycled mine out of junk. When I was 8, I came across Art Swan's FM transmitter circuit. It's great for room monitoring, baby listening and nature research.įM transmitters remind me of my early years in electronics. It has a range of up to 1/4 mile or more. There's no need to buy kits, this tutorial includes the PCB layout and the schematics. Have you ever wanted to broadcast your own radio station within your neighborhood? Ever get curious on where people get those "Surveillance Bugs" from spy and action movies? This small and simple FM transmitter is the toy that geeks have always wanted.įM transmitters can be complicated to build, that's why I'm teaching you how to make a foolproof FM transmitter.
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