Here is the forums area for posting interesting radio transmitter and exciter circuits from simple to complex including other various circuits dedicated to this subject.
This thread will be updated periodically with more schematics over time.
If you have a schematic or project of your own feel welcome to post a link/picture here. If necessary you can email me your schematic and I can host it for you.
Last update on: Jan 11, 2014.
Most basic FM transmitters/bugs you could build aka-"toys"
Simple 2 transistor (mod/osc) FM bug type transmitter...
Simple all in one BA1404 IC transmitterfor Part 15 FM stereo broadcasting... (Note: This IC is no longer being produced and is of low quality anyways, but is okay for very simple yardcasting, also uses a tunable oscillator so is not very stable for newer radio receivers to lock onto, but is a good learning project)
Simple all in one BH1417 IC transmitter (internal PLL for stability) for Part 15 FM stereo broadcasting...
Higher quality design using common logic IC chips but more complex to design..
Good quality MPX encoder using very common to find 455kHz ceramic resonator for pilot stability that is almost as good as quartz crystal controlled. Really cost effective and makes life easier for those hard to find quartz crystal designs... (note: 18kHz must be a mistake on their schematic, I believe it should read 19kHz, but the design is the same otherwise)
Very good design that yours truly used as a basis to learn from using common ICs with excellent stereo separation and clean audio spectrum..