1 transistor FM Transmitter DIY learning kit

Here's A Simple Do-It-Yourself (DIY) FM Transmitter Kit. You Can Use This Simple DIY Kit To Transmit Your Voice Or Audio To Your Nearest FM Radio.

b. Audio transmission connecting speaker stereo jack to audio source: For hearing a better sound, you may connect it to your computer, iPod or mp3 player using a speaker jack. The audio of your music players gets transmitted to your nearby radio.

It comes as a pack of parts kit and can be easily assembled if you can follow the silkscreen indicators (labels) and have beginning experience with a soldering iron. You will need to read the resistor bands or use a multimeter to determine the resistor sizes. The kit operates with a 3-9V power supply. 

Features:

• Frequency Range: 88-108MHZ (Frequency can be changed by moving the adjustable inductor coil).
• Operating voltage: 3V-9V.
• Transmission range: The transmission range depends upon the length of the antenna used. We send a simple 20cm long wire that should transmit signals around 10m inside your room. The signal can be transmitted ever far with a longer antenna of length around 50cm. It can transmit up to 100m in open space.
  

Documents:

• About FM transmitter DIY kit
• Assembly tutorial
• Schematic
• Flickr Images
• Video 1- Audio transmission from computer/music player
• Video 2- Voice transmission using electret microphone.
• How does electret microphone work.
• You can read more about FM transmission on this page.