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200. L uses an enameled wire with a diameter of 1 mm, which is wound around 4 turns and has a hollow diameter of about 5 mm. The antenna can be used with multiple thin wires and is about 50 cm long. The microphone has a radio earphone with an impedance of 800 ohms and other components are not required.
All components can be mounted on the printed circuit board of Figure 11.10.2. After installation, the components can be energized and tested. In general, the circuit will start to oscillate. Can play at this time
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