We found this FM transmitter circuit with the 2N2218 transistor in a documentation from the 90s. The circuit must be powered by 12 V battery or source with excellent filtering and already includes a 3-input mixer. The circuit also has a modulation indicator. L1 has 4 turns of wire 18 and L2 in 5 turns of the same wire in the form of 1 cm without core.
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