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15 Mar 2012
This small transmitter can reach more than 1 km under good conditions . The input can either be an electret microphone or other audio source. The frequency is given by CV (trimmer common 2-20 or 3-30pF) and L1 4 or 5 turns of 22 AWG enameled wire with a diameter of 1 cm with air core.
FM transmitter with 2N2218 - [Link]
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