This transmitter sends its signals to a MW radio over a distance of a few meters. The antenna must be 80 to 150 cm and the L1 coil consists of 40 + 40 turns of wire 26 or 28 in a ferrite rod. The transistor can be the BC558 and the ceramic microphone must be connected to J1. The coil L2 consists of 15 turns of wire 26 or 28 over L1. Observe the winding direction so that the circuit oscillates. The circuit can be powered by 4 batteries or 9 V battery.
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