The transmitter is assembled on the transistor pn2222a, which also functions as a receiver when receiving. T2 is a low-frequency preamplifier. The low-frequency amplifier must be powered from a separate source, otherwise whistling and self-excitation will occur.
Coil L2 contains 28 turns of wire with a diameter of 0.6 mm wound on a frame with a diameter of 15 mm. When key S1 is pressed, a signal will be transmitted; when released, a signal will be received. The sound signal must be amplified by a low-frequency amplifier
Sinusoidal signal with a transmitter load of 50 Ohm resistor. Current consumption during transmission is about 180 mA
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