I've been looking into building an FM transmitter recently and discovered audioguru's Mod4 circuit. It seems to be one of the best on the internet (I've searched through a lot)! I will be using the stereo input addition, and I am wondering what kind of wire I must use for the coils. I know enameled copper wire is usually used but I can't seem to find where to purchase it or get it from another device. I also read that normal #24 AWG hookup wire can be used. Is this true? And if so, will performance be affected if I use it? Finally, is it okay if I power the whole circuit from 5 volts (including the last part). I am guessing that the output range will simply be less.

Thanks!

OK, thanks for the help. Maybe I'll look around for a speaker to rip open...

Darn, I can't seem to get it working... I got everything soldered together on prototyping board being mindful of keeping all of the components close. I have already examined my board for any shorts or wiring mistakes, (I don't think I missed anything). I plugged it into the headphone output of my computer and turned it on, with a radio nearby on an empty station. I have tryed tuning it by rotating Q2's trimmer cap, but to no avail.
I know I should be using a ceramic or plastic screwdriver because the stray capacitance will mess it up otherwise. My radio is about 20 ft away from me when I'm trying to tune it. I know the computer output is working because I can use normal headphones with it.
Also, I know I got a good connection with all of my components and the headphone wire. While tuning, I could have sworn I faintly heard the music being received once or twice, but then it would go away before I could confirm. Other times while spinning the trimmer cap, other stations would start to come in clearer. I think it's oscillating, because if I tap the trimmer cap with a metal screwdriver, I can hear it on the radio. I am using a 30" long antenna and my circuit is 2cm X 5.5cm. I know a steady 5 volts is going to the main circuit, and 9 volts is going to the last amp stage. Following are voltages for the three transistors while supposedly transmitting music:

My multimeter says it's drawing about 10-12 mA.

Q1-Vc = 2.58V
Q1-Vb = 0.75V
Q1-Ve = 0.1V

Q2-Vc = 5.23V
Q2-Vb = 1.58V
Q2-Ve = 1.29V

Q3-Vc = 9.7V
Q3-Vb = 0.75V
Q3-Ve = 0.05V

Hey Birdman? Do you have a scope? If it is oscillating it is probably not on frequency. A frequency counter would come in handy as well.

Ok well that's good news. By the way I was measuring current wrongly, so it did come out to about 53 mA. I'm gonna test for wrong connections and component values and hopefully I'll figure it out... Thanks again!