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    High quality banner / frequency modulator circuit (ULN2242) ----- ULN2242 AM / FM RADIO

     

    High quality banner / frequency modulator circuit (ULN2242), ULN2242 AM / FM RADIO Keywords: ULN2242 radio circuit diagram Be The ULN-2242A integrated circuit is shown. Here, the magnetic bar antenna TB1 is used instead of an external antenna, and the switching switch S can achieve the switching switch S, the A-to stereo circuit, the B to medium discharge circuit, C The end input is no noise signal voltage, and D is the low frequency signal output. Some component specifications: Z1: FM intermediate frequency filter VT1: Transistor MP53563, FM converter VT2: Transistor MPSH-04, adjustment high frequency amplification T1: magnetic rod antenna coil, 571uh, number of turns ratio 17: 1, quality factor q = 150 T2: Amplitude of the abutment circuit, the number of turns is 11: 1, the quality factor Q = 50 T3: Amplitude modulator loop, 256UH, number of turns 5.4: 1, quality factor Q = 75 T4: FM external circuit, quality factor Q = 65 T5: FM input loop, number of turns ratio 7: 1, quality factor Q = 90

     

     

     

     

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