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    Simple Zhongwang Radio ----- AM Radio

     

    Simple Mid-wave radio, am radio Keywords: Zhong wave radio mechanism, AM radio mechanism, NE5534 circuit The circuit of the simple medium wave radio is shown in the figure. The machine has certain sensitivity, output power is 0.5 ~ O.8W, does not require an external antenna or ground. The heart of the circuit is. ICI (5534aN), is a low noise high frequency front amplifier, coupled to comparator circuits with positive feedback. By changing the capacitor VCL and inductance L1, the loop resonance is resoned to the frequency of the receiving station, the weak alternating voltage is sent to the resonant circuit of the ICL input, and is greatly enlarged, and the 6 foot of the ICl is output. D1, R2 and C2, etc., D1 is a germanium diode (also available with silicon diode), and the charge and discharge of capacitance C2 is used, and audio signals are widened at both ends of C2 and R2. C3 will couple the audio signal after the detection to the 0.5W amplifier IC2, adjust the output of the output, and the remaining high-frequency shampoo output from the detector output, which may overload the IC2. Since the output of the ICL is not too high, the IC2 1 and 8th feet are indirectly c5 to increase the gain of IC2. The medium wave roll L1 can be in line with a lacquer line on a 10 mm ferrite rod, and a 0.315 mm enamel wire is selected from about 80 turns. Pay attention to testing without using a crocodile clip, apply a shielded cable connection to avoid radio frequency interference. The radio is less than 10 mA, and the current consumption current is 20 mA when the maximum volume is.

     

     

     

     

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