Long wave radio transmitter at a frequency of approximately 170 kHz with a range of no more than 10 meters with a ferrite antenna. Transistor 2SK30A. Winding L1 contains 60 turns and winding L2 contains 20 turns, wire with a diameter of 0.14 mm. Ferrite core with a diameter of 8-10 mm and a length of 8 centimeters, but these data on ferrite can be changed, this will only change the frequency.
When you turn it on for the first time, the transmitter should start working immediately, otherwise swap the terminals of the L2 coil or wind and unwind the turns of the wire.
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