I would like to build an FM transmitter on my own and I found a nice circuit that acts as a USB sound card to transmit low power FM signals. http://tipok.org.ua/node/35
My plan is to add another amplification stage with an additional device, commonly called FM Booster / FM Amplifier. There's one around fmuser.org that claims to amplify input signals from 0.2 to 0.4W up to 30W.
Unfortunately the output of FM Stick is only up to 0.1W. They use a transistor circuit around BFG541.
I really would like to use of-the-shelve parts only (like FM Stick does). At the same time I know that this will limit the maximum output of the circuit. But to what extent? What's the maximum RF output possible if one sticks to readymade parts?
I could not find any other circuit in the interweb, that does not rely on handmade coils.
Thanks in advance & Regards, Hans