long distance wireless spy devices

[Ian]

Hi
so i have bean wanting to make some long distance wireless spy microphone. i found some tutes but they can only go through a couple rooms. it does not need to go a couple miles. just a 1/4m or so if that far. so if you could help me that would help a lot.

[johnboxall]

Visit here - http://www.talkingelectronics.com/te_interactive_index.html
On the left is a long index of pages, scroll down to FM bugs (etc.)

Colin has got you covered - there are heaps of different transmitter circuits.