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    Small FM transmit circuit diagram

     

    The monolithic integrated frequency modulation circuit composed of MC2831A and peripheral components is shown as shown. The MC2831A operating voltage is 3 to 9V. The frequency of the crystal SJT is selected between 22 to 30 MHz. The L1 line diameter is 0.1 mm high intensity enamel line, and 30 turns on the high frequency skeleton, and the inductor is about 10uh. The L2 skeleton has the same line diameter of 0.12mm high strength enamel line, the primary is 10, 3 turns tap, the secondary 4. L3 is wound into an inner diameter of 6mm, 8 of a hollow coil with a 0.55 mm high intensity enameled wire. The antenna FX is pulled with 1 ~ 2m. The circuit emission distance can reach 200m or more, and it is not enough output power when it is not emanded, which is not conducive to long distance transmission.

     

     

     

     

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