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    Integrated FM receiver with FM transmitter IC TA7335 production

    TA7335 pin function as follows: ① the antenna signal input pin; ② feet to power; ③ High-level output pin external tuner circuit; ④ pin mixer input; ⑤ and feet; ⑥ pin mixer output; ⑦ pin internal oscillator external LC circuit; ⑧, ⑨ feet between the inside of a varactor diode. When the left and right audio signals by R4, R5 mixed input, adjust the signal from the size of W, the C7, L3 into ⑧ feet, ⑧, ⑨ foot capacity of the internal varactor diode changes with the audio signal, thereby changing the foot ⑦ resonant frequency of the external circuit, the realization of the oscillator carrier frequency modulation. ⑨ pin external components for internal varactor diode to provide a stable voltage. LED doubles as a power indicator. Oscillation signal has been tuned into the mixer in the internal input (in this case as the amplifier), the output from the ⑥ feet, out through the antenna.
        
    When the actual production, L1, L2 are in the pen with ∮ 0.5mm enameled wire tightly wound 6 turns bodiless heart from which the center tap L2. Small inductor L3 can also be replaced with 10kΩ resistor. With a soft wire antenna, rod antenna can be. Circuit power, the tuning can change the firing frequency of C1, C3 to launch the strongest signal conditioning, the role of distances can be. To reduce interference, the input signal lines should be shielded cable.
     
     

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